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Is there a 220v three phase?
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Jan 3, 2018
by
anonymous
Is there a 220v three phase?
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Jan 3, 2018
by
jihadio k jeeja
No,its single phase
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asked
Aug 19, 2019
by
anonymous
If 1-phase voltage is 220V, why is 3-phase 440V and not 660V ?
If 1-phase voltage is 220V, why is 3-phase 440V and not 660V ?
Last answer:
Phase voltage =220v /( phase to neutral) Line voltage = 380 v ( phase to phase) Phase angle difference 120° So when two phases reach vmax +ve I.e. (+220v) + (+220v) = 440v that time due ... these event happen very fast. Hence we have 440 v only in three phase motor. √3.phase voltage= 380 v.
1-phase
voltage
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asked
Apr 11, 2018
by
anonymous
If a 220/440 V, 50 Hz, 5 KVA, single-phase transformer operates on 220V, 40Hz supply with secondary winding...
If a 220/440 V, 50 Hz, 5 KVA, single-phase transformer operates on 220V, 40Hz supply with secondary winding open circuited: (A) both the eddy current and the hysteresis losses will decrease (B) both the eddy current and the hysteresis losses will increase (C) eddy current losses will remain the same but the hysteresis losses will increase (D) eddy current losses will increase but the hysteresis losses will remain the same
Last answer:
If a 220/440 V, 50 Hz, 5 KVA, single-phase transformer operates on 220V, 40Hz supply with secondary winding open circuited: both the eddy current and the hysteresis losses will decrease
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asked
Sep 1, 2018
by
anonymous
If the no load voltage of a certain generator is 220V and the rated load voltage is 200V, then the voltage regulation is: a. 1% b. 10% c. 20V d. 9%
If the no load voltage of a certain generator is 220V and the rated load voltage is 200V, then the voltage regulation is: a. 1% b. 10% c. 20V d. 9%
Last answer:
If the no load voltage of a certain generator is 220V and the rated load voltage is 200V, then the voltage regulation is: a. 1% b. 10% c. 20V d. 9%
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1
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asked
Apr 30, 2018
by
anonymous
In a 3 -phase alternator, if there is only magnetizing armature reaction, the load is :
In a 3 -phase alternator, if there is only magnetizing armature reaction, the load is : (A) capacitive (B) inductive (C) resistive (D) inductive and resistive
Last answer:
In a 3 -phase alternator, if there is only magnetizing armature reaction, the load is : capacitive
magnetizing
armature
reaction
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asked
Apr 12, 2018
by
anonymous
In a Y -connected circuit, between each line -voltage and the nearest phase - voltage, there is a phase -angle of:
In a Y -connected circuit, between each line -voltage and the nearest phase - voltage, there is a phase -angle of: A. 0° B. 30° C. 60° D. 120°
Last answer:
B
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asked
Apr 9, 2018
by
anonymous
A dc shunt generator has a speed of 800 rpm when delivering 20 A to the load at the terminal voltage of 220V....
A dc shunt generator has a speed of 800 rpm when delivering 20 A to the load at the terminal voltage of 220V. If the same machine is run as a motor it takes a line current of 20A from 220V supply. The speed of the machine (in rpm) will be: (A) 800 (B) more than 800 (C) less than 800 (D) none of the above
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answers
asked
Jan 11
by
anonymous
The number of candidates writing three different entrance exams is in the ratio 4:5:6. There is a proposal to increase these numbers of candidates by 40%, 60% and 85% respectively. What will be the ratio of increased numbers? a) 14:15:16 b) 12:15:19 c)13:19:21 d) 14:16:19 E) None of these
The number of candidates writing three different entrance exams is in the ratio 4:5:6. There is a proposal to increase these numbers of candidates by 40%, 60% and 85% respectively. What will be the ratio of increased numbers? a) 14:15:16 b) 12:15:19 c)13:19:21 d) 14:16:19 E) None of these
Last answer:
Answer : E Given ratio of number of candidates is 4:5:6 Let the number of candidates for 3 exams be 4k, 5k and 6k respectively. After increasing, number of candidates become (140% of 4k), (160% of 5k) & (185% ... 111k/10 Now, the required new ratio is: 56k/100 : 80k/10 : 111k/10 = 56 : 80 : 111
ratio-and-proportion
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asked
Jan 11
by
anonymous
Manish, Rahul and Bharti have some stones with each of the. Five times the number of stones with Rahul equals seven times the number of stones with Manish while five times the number of stones with Manish equals seven times the number of stones with Bharti. What is the minimum number of stones that can be there with all three of them put together? A) 113 B) 109 C) 93 D) 97 E) NONE
Manish, Rahul and Bharti have some stones with each of the. Five times the number of stones with Rahul equals seven times the number of stones with Manish while five times the number of stones with Manish equals seven times the number of stones with Bharti. What is the minimum number of stones that can be there with all three of them put together? A) 113 B) 109 C) 93 D) 97 E) NONE
Last answer:
Answer: B
ratio-and-proportion
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asked
Jan 10
by
anonymous
There are three different categories of jobs A, B and C. The average salary of the students who got the job of A and B categories is Rs.32 lakh per annum. The average salary of the student who got the job of B and C category is 54 lakh per annum. And the average salary of those students who got the job of A and C is Rs.44 lakh per annum. The most appropriate (or closet) range of average salary of all the three categories (if it is known that each student gets only one category for jobs i.e, A, B and C): A) lies between 30 & 44 B) lies between 48 & 56 C) lies between 38 & 45 D) lies between 49 & 50
There are three different categories of jobs A, B and C. The average salary of the students who got the job of A and B categories is Rs.32 lakh per annum. The average salary of the student who got the job of B and C category is 54 lakh per annum. And the average salary of those students who got the job of A and C is Rs.44 lakh per annum. ... one category for jobs i.e, A, B and C): A) lies between 30 & 44 B) lies between 48 & 56 C) lies between 38 & 45 D) lies between 49 & 50
Last answer:
Answer: C) Let the number of students who got the jobs of A, B and C categories is a, b and c respectively, ∴Total salary of Aand B = 32 (a +b) ∴Total salary of B and C = 54 (b+ ... the minimum salary must be Rs.38 lakh and the maximum salary cannot exceed 45, which is the highest of the three..
average
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asked
Jan 9
by
anonymous
In a batch, there are 22 boys and 18 girls. Three students are selected at random. The probability that 1 girl and 2 boys are selected, is: a) 3754/8854 b) 4158/9880 c) 8514/9880 d) 2078/4920
In a batch, there are 22 boys and 18 girls. Three students are selected at random. The probability that 1 girl and 2 boys are selected, is: a) 3754/8854 b) 4158/9880 c) 8514/9880 d) 2078/4920
Last answer:
Answer: B) Let , S - sample space E - event of selecting 1 girl and 2 boys. Then, n(S) = Number ways of selecting 3 students out of 40 = 40C3 = 9880 n(E) = 18C1 *22C2 = 18*231 = 4158 P(E) = n(E)/n(s) = 4158/9880
probability
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asked
Jan 9
by
anonymous
A merchant mixes three varieties of rice costing Rs.40/kg, Rs.48/kg and Rs.60/kg and sells the mixture at a profit of 40% at Rs.60 / kg. How many kgs of the second variety will be in the mixture if 4 kgs of the third variety is there in the mixture? a) 1 kg b) 20 kgs c) 3 kgs d) 6 kgs e) 8kgs
A merchant mixes three varieties of rice costing Rs.40/kg, Rs.48/kg and Rs.60/kg and sells the mixture at a profit of 40% at Rs.60 / kg. How many kgs of the second variety will be in the mixture if 4 kgs of the third variety is there in the mixture? a) 1 kg b) 20 kgs c) 3 kgs d) 6 kgs e) 8kgs
Last answer:
D If the selling price of mixture is Rs.60/kg and the merchant makes a profit of 20%, then the cost price of the mixture = 60/1.2 = Rs.50/kg. We need to find out the ratio in which the three varieties are mixed ... QC in step 1 and step 2 = 1 + 5 = 6 Therefore, the ratio = 1 : 25 : 5
mixture
alligation
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asked
Aug 2, 2020
by
anonymous
A glass cube with 27 equal compartments is filled with water. There are a few red balls floating inside the compartments. Three views of the cube are shown below. Identify the red ball(s) that is/are represented incorrectly in the top view.
Last answer:
B
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53
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1
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asked
Oct 6, 2018
by
anonymous
Why there are three lines for distribution
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159
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0
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asked
Sep 2, 2019
by
anonymous
Why is a capacitor used in a single phase motor and not in three phase motor ?
Why is a capacitor used in a single phase motor and not in three phase motor ?
Last answer:
In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.
capacitor
single
three
phase
motor
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127
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6
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asked
Aug 18, 2019
by
anonymous
Why is a three phase denoted by R, Y, B ?
Why is a three phase denoted by R, Y, B ?
Last answer:
phase 1 ,R =Red colour cable terminal, phase 2 Y=Yellow colour terminal cable,Phase 3 B=Blue colour cable terminal, N =Neutral. For identification.
three
phase
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171
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2
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asked
May 22, 2018
by
anonymous
In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system
In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system and line to line voltage is 100 V. The supply frequency is 400 Hz. The ripple frequency at the output is: (1) 400 Hz (2) 800 Hz (3) 1200 Hz (4) None of these
Last answer:
In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system and line to line voltage is 100 V. The supply frequency is 400 Hz. The ripple frequency at the output is: 1200 Hz
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73
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1
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asked
Apr 28, 2018
by
anonymous
When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is
When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is (A) 86.6% (B) 50% (C) 57.7% (D) 73.2%
Last answer:
When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is 73.2%
three
phase
system
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71
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1
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asked
Apr 25, 2018
by
anonymous
A three phase induction motor is driving full -load torque which is independent of speed. If the line voltage...
A three phase induction motor is driving full -load torque which is independent of speed. If the line voltage drops to 90% of the rated value, % increase in motor copper losses (a) 23% (b) -18% (c) 123% (d) None of these
Last answer:
A three phase induction motor is driving full -load torque which is independent of speed. If the line voltage drops to 90% of the rated value, % increase in motor copper losses (a) 23% (b) -18% (c) 123% (d) None of these
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132
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1
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asked
Apr 25, 2018
by
anonymous
A three-phase star -connected load is operating at a power factor angle ϕ with ϕ being the angle between
A three-phase star -connected load is operating at a power factor angle ϕ with ϕ being the angle between
Last answer:
A three-phase star -connected load is operating at a power factor angle ϕ with ϕ being the angle between Phase voltage and phase current
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1
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asked
Apr 14, 2018
by
anonymous
The power input to the rotor of a 400V, 50 Hz 6 pole three phase induction motor is 20kW. The slip is 3%...
The power input to the rotor of a 400V, 50 Hz 6 pole three phase induction motor is 20kW. The slip is 3%. The frequency of rotor currents is: (A) 1 Hz (B) 1.5 Hz (C) 2 Hz (D) 1 2 Hz
Last answer:
C
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266
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1
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asked
Apr 12, 2018
by
anonymous
In a three-phase system, when the loads are perfectly balanced, the value of neutral current is equal to:
In a three-phase system, when the loads are perfectly balanced, the value of neutral current is equal to: A. Zero B. One-third of the maximum value C. Two -third of the maximum value D. The maximum value
Last answer:
In a three-phase system, when the loads are perfectly balanced, the value of neutral current is equal to: Zero
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140
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1
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asked
Apr 11, 2018
by
anonymous
A balanced three-phase, 50 Hz voltage is applied to a 3 phase, 4 pole, induction motor. When the motor is ...
A balanced three-phase, 50 Hz voltage is applied to a 3 phase, 4 pole, induction motor. When the motor is delivering rated output, the slip is found to be 0.05. The speed of the rotor m.m.f. relative to the rotor structure is: (A) 1500 r.p.m. (B) 1425 r.p.m. (C) 25 r.p.m. (D) 75 r.p.m
Last answer:
A balanced three-phase, 50 Hz voltage is applied to a 3 phase, 4 pole, induction motor. When the motor is delivering rated output, the slip is found to be 0.05. The speed of the rotor m.m.f. relative to the rotor structure is: 75 r.p.m
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814
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1
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asked
Apr 11, 2018
by
anonymous
At slip equal to infinity, the torque of a three phase induction motor is :-
At slip equal to infinity, the torque of a three phase induction motor is :- a) zero b) very small c) high d) very high
Last answer:
At slip equal to infinity, the torque of a three phase induction motor is :- zero
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2.7k
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1
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asked
Apr 10, 2018
by
anonymous
If the stator winding of a three-phase induction motor is delta connected, the rotor winding
If the stator winding of a three-phase induction motor is delta connected, the rotor winding (a) should be delta connected (b) should be star connected (c) should not be delta connected (d) may be delta or star connected
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105
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asked
Apr 5, 2018
by
anonymous
A three phase breaker is rated at 2000 MVA, 33 kV, its making current is...
A three phase breaker is rated at 2000 MVA, 33 kV, its making current is (A) 70 kA (B) 89 kA (C) 49 kA (D) 35 kA
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573
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0
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asked
Apr 5, 2018
by
anonymous
A three phase 50 Hz, 400 kV transmission line is 300 km long. The line inductance is 0.97 mH/km per phase...
A three phase 50 Hz, 400 kV transmission line is 300 km long. The line inductance is 0.97 mH/km per phase and capacitance is 0.0115 mF/km per phase. Assume a loss less line. Determine the line wavelength (a line phase constant). (A) 1250 km (B) 6578 km (C) 4990 km (D) 2445 km
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203
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0
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asked
Mar 25, 2018
by
anonymous
In a three-phase supply floating neutral is undesirable because it way give rise to?
In a three-phase supply floating neutral is undesirable because it way give rise to?
Last answer:
In a three-phase supply floating neutral is undesirable because it way give rise to unequal line voltages across the load.
three
phase
supply
floating
neutral
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1
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asked
Jan 10
by
anonymous
Three friends started a Company, let there names are P, Qand R. What profit Q will get, if, 1. R invested Rs. 4000 for nine months, his profit was 3/2 times that of Q's and his investment was four times that of P. 2. P and Q invested for one year in the proportion 1 : 2 respectively. 3. The three together got Rs. 500 as profit at the year end. A) Only 1 and 3 B) Only 1 and 2 C) All 1, 2 and 3 D) None of above
Three friends started a Company, let there names are P, Qand R. What profit Q will get, if, 1. R invested Rs. 4000 for nine months, his profit was 3/2 times that of Q's and his investment was four times that of P. 2. P and Q invested for one year in the proportion 1 : 2 respectively. 3. The three together got Rs. 500 as profit at the year end. A) Only 1 and 3 B) Only 1 and 2 C) All 1, 2 and 3 D) None of above
Last answer:
Answer: C) 1 and 2 will give : R = Rs. (4000 x 9) for 1 year = Rs. 36000 for 1 year. P = Rs. (1/4 * 4000 * 12 ) for 1 year = Rs 12000 for 1 year Q = Rs 24000 for one year R:P:Q = ... Profit = 500 Now from the ratio and total profit we can get Share of R. R share will be = 500 * 2/6 = 166.66
partnership
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asked
Sep 18, 2018
by
anonymous
State any two advantage of three phase transformer over a bank of three single phase transformer.
Last answer:
Advantages of three phase transformer over bank of single phase transformers: For identical magnitudes of power transformation, i) Saving in copper conductor. ii) Saving in electromagnetic core material. ... material such as insulating oil. v) Saving in overall cost. vi) Higher efficiency.
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1
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asked
Apr 25, 2018
by
anonymous
In a 3-phase 4-wire distribution system three unbalanced but equal magnitude impedances are connected...
In a 3-phase 4-wire distribution system three unbalanced but equal magnitude impedances are connected between respective lines and neutral. The magnitude of current in the neutral conductor for RYB and RBY phase sequences are (A) zero (B) same (C) different (D) same in magnitude but differs in phase.
Last answer:
In a 3-phase 4-wire distribution system three unbalanced but equal magnitude impedances are connected between respective lines and neutral. The magnitude of current in the neutral conductor for RYB and RBY phase sequences are different
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85
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1
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asked
Apr 23, 2018
by
anonymous
Three equal impedances are first connected in delta across a 3 -phase balanced supply. If the same...
Three equal impedances are first connected in delta across a 3 -phase balanced supply. If the same impedances are connected in star across the same supply then,
Last answer:
A
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985
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2
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asked
Apr 14, 2018
by
anonymous
A three phase transformer can be used in emergency at reduced rating of 58% to deliver three phase power...
A three phase transformer can be used in emergency at reduced rating of 58% to deliver three phase power when it is connected (a) in star-delta (b) delta-star (c) star-star (d) delta-delta
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76
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asked
Apr 12, 2018
by
anonymous
Two wattmeters connected to measure the power input to a balanced three-phase circuit indicate ...
Two wattmeters connected to measure the power input to a balanced three-phase circuit indicate 4.5 KW and 3 KW respectively. Find the power factor of the circuit. A. 0.7 B. 0.8 C. 0.95 D. 0
Last answer:
Two wattmeters connected to measure the power input to a balanced three-phase circuit indicate 4.5 KW and 3 KW respectively. Find the power factor of the circuit. 0.95
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286
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1
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asked
Apr 12, 2018
by
anonymous
The power delivered to a three-phase load can be measured by the use of 2 wattmeter only when the
The power delivered to a three-phase load can be measured by the use of 2 wattmeter only when the A. Load is balanced B. 3 -phase load is connected to the source through 3 wires C. Load is unbalanced D. 3 -phase load is connected to the source through 4 wires
Last answer:
The power delivered to a three-phase load can be measured by the use of 2 wattmeter only when the Load is unbalanced
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151
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asked
Apr 12, 2018
by
anonymous
In a certain three -wire Y -connected generator, the phase voltages are 2 kV. The magnitudes of the line...
In a certain three -wire Y -connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages will be: A. 2,000 V B. 6,000 V C. 666 V D. 3,464 V
Last answer:
In a certain three -wire Y -connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages will be: 3,464 V
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188
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asked
Apr 9, 2018
by
anonymous
Two wattmeter method can be used in a three phase system excited with balanced three phase supply...
Two wattmeter method can be used in a three phase system excited with balanced three phase supply A) To measure real power and power factor in a balanced load B) To measure reactive power in a balanced load C) To measure real power in an unbalanced load D) All of the above
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61
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Apr 5, 2018
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anonymous
A three phase transmission line delivers a load of 5 MW at 0.8 power factor lagging. Resistance of each...
A three phase transmission line delivers a load of 5 MW at 0.8 power factor lagging. Resistance of each conductor is 0.5 ohm / km. Receiving end voltage is 33 kV. If the line loss is not to exceed 10%, determine the length of the line. (A) 7 km (B) 27.9 km (C) 56.8 km (D) 13.9 km
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104
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Apr 5, 2018
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anonymous
Three single phase transformers are connected in delta-delta to step down a line voltage of 138 kV to...
Three single phase transformers are connected in delta-delta to step down a line voltage of 138 kV to 4160 V to supply power to a production plant. The plant draws 21 MW at a lagging power factor of 86 %. Calculate the apparent power furnished by the HV line. (A) 24.4 MVA (B) 48.8 MVA (C) 12.2 MVA (D) 6.1 MVA
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Apr 5, 2018
by
anonymous
The sending and receiving end voltages of a three phase transmission line at 100 MW load are equal at ...
The sending and receiving end voltages of a three phase transmission line at 100 MW load are equal at 230 KV. The phase line impedance is j14 ohm. Calculate the maximum steady state power that can be transmitted over the line. (A) 3778.5 MW (B) 2234.56 MW (C) 1784.19 MW (D) 512.37 MW
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94
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asked
Apr 9, 2018
by
anonymous
An electric iron designed for 110V AC supply was rated at 500W. It was put across a 220V supply. ...
An electric iron designed for 110V AC supply was rated at 500W. It was put across a 220V supply. Assuming that at 110V it supplied 500W output (i.e no losses) at the new voltage it will supply a. 2500W b. 250W c. 500W d. 2000W
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153
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asked
Sep 18, 2018
by
anonymous
Give the specification of three phase transformer as per IS 1180(Part-1) 1989.
Give the specification of three phase transformer as per IS 1180(Part-1) 1989.
Last answer:
Specification of 3-phase transformer: 1) kVA rating of transformer 2) Voltage ratings for the primary and secondary voltages 3) HV and LV currents 4) Operating frequency of the transformer 5) % impedance of ... the manufacturer 16) Weight of core 17) Weight of winding 18) Volume of oil in litres.
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asked
May 13, 2018
by
anonymous
What should be kVA rating of each transformer in V-V bank when three phase balanced load is
What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA ? (A) 19 (B) 28 (C) 37 (D) 23
Last answer:
What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA ? (A) 19 (B) 28 (C) 37 (D) 23
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Apr 10, 2018
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anonymous
In three phase 400 volt, 50 Hz supply, the phase to neutral voltage is
In three phase 400 volt, 50 Hz supply, the phase to neutral voltage is (a) 220 Volt (b) 230 Volt (c) 440 Volt (d) 150 Volt
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Mar 28, 2018
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anonymous
There are three 100 bulbs in parallel across 220 V.50 Hz line. If one bulb burns out:
Last answer:
There are three 100 bulbs in parallel across 220 V.50 Hz line. If one bulb burns out: Remaining two bulbs will produce light.
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Oct 7, 2020
by
anonymous
A three-phase synchronous motor has a terminal voltage of 460 V and a terminal current of 120 A at a power factor of 0.95 lagging, synchronous reactance of 1.68 ohm and the field current is 47 A. The field to armature mutual inductance of the synchronous motor is _____________.
A three-phase synchronous motor has a terminal voltage of 460 V and a terminal current of 120 A at a power factor of 0.95 lagging, synchronous reactance of 1.68 ohm and the field current is 47 A. The field to armature mutual inductance of the synchronous motor is _____________. (a). 20mH (b). 16mH (c). 24mH (d). 22mH
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22
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Aug 12, 2018
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anonymous
For a balanced three phase star connected load for which line voltage is 230V and per phase resistance and reactance is 6 Ohm and 8 Ohm respectively. Calculate: 1) phase voltage 2) line current 3) power factor 4) total power absorbed
For a balanced three phase star connected load for which line voltage is 230V and per phase resistance and reactance is 6 Ohm and 8 Ohm respectively. Calculate: 1) phase voltage 2) line current 3) power factor 4) total power absorbed
phase
voltage
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Aug 12, 2018
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anonymous
A balanced Delta connected load supplied with 440 V 50 Hz three phase AC supply has R=10 Ohm and L=0.6 mH in is each arm. Calculate line and phase current, active power.
A balanced Delta connected load supplied with 440 V 50 Hz three phase AC supply has R=10 Ohm and L=0.6 mH in is each arm. Calculate line and phase current, active power.
balanced
three-phase
delta
connected
load
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Aug 12, 2018
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anonymous
A balanced three phase star connected load is supplied from a three phase 400V 50 Hz supply.
A balanced three phase star connected load is supplied from a three phase 400V 50 Hz supply. The resistance for per phase is 10 Ohm. Find the value of phase current, line current, power factor and total power consumed.
balanced
three-phase
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Jun 4, 2018
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anonymous
A three-phase transformer, connected in star-delta, is composed of three single-phase transformers, each
A three-phase transformer, connected in star-delta, is composed of three single-phase transformers, each rated 127/ 13.2 kV. The line-to-line voltage ratio for the three-phase transformer is: A) 220 / 13.2 kV B) 127 / 13.2 kV C) 127 / 220 kV D) 220 / 220 kV
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A three-phase transformer, connected in star-delta, is composed of three single-phase transformers, each rated 127/ 13.2 kV. The line-to-line voltage ratio for the three-phase transformer is: 220 / 13.2 kV
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May 25, 2018
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A three phase diode bridge rectifier is fed from a 400 V rms, 50 Hz, three phase a.c. source. For the purely
A three phase diode bridge rectifier is fed from a 400 V rms, 50 Hz, three phase a.c. source. For the purely resistive load, the peak instantaneous output voltage is
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