Is there a 220v three phase?

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asked Jan 3, 2018 by anonymous

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asked Aug 19, 2019 by anonymous

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.

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133 views 4 answers

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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181 views 1 answer

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%

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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230 views 1 answer

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

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75 views 1 answer

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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2.7k views 2 answers

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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120 views 0 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

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

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9 views 1 answer

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

Last answer: Answer: B

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15 views 1 answer

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..

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5 views 1 answer

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

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

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4 views 1 answer

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

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

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3 views 1 answer

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 views 1 answer

asked Oct 6, 2018 by anonymous

Why there are three lines for distribution

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159 views 0 answers

asked Sep 2, 2019 by anonymous

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.

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127 views 6 answers

asked Aug 18, 2019 by anonymous

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.

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171 views 2 answers

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 views 1 answer

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%

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71 views 1 answer

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 views 1 answer

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

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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66 views 1 answer

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 views 1 answer

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 views 1 answer

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 views 1 answer

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 views 1 answer

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 views 0 answers

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 views 0 answers

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 views 0 answers

asked Mar 25, 2018 by anonymous

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.

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88 views 1 answer

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

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

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5 views 1 answer

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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46 views 1 answer

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 views 1 answer

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 views 2 answers

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 views 0 answers

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 views 1 answer

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 views 1 answer

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 views 1 answer

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 views 0 answers

asked Apr 5, 2018 by 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 views 0 answers

asked Apr 5, 2018 by 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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81 views 0 answers

asked 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 views 0 answers

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 views 0 answers

asked Sep 18, 2018 by anonymous

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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69 views 1 answer

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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220 views 1 answer

asked Apr 10, 2018 by 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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66 views 0 answers

asked Mar 28, 2018 by 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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80 views 1 answer

asked 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

Last answer: 22

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239 views 1 answer

asked Aug 12, 2018 by 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

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147 views 0 answers

asked Aug 12, 2018 by 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.

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173 views 0 answers

asked Aug 12, 2018 by 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.

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73 views 0 answers

asked Jun 4, 2018 by 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

Last answer: 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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84 views 1 answer

asked May 25, 2018 by anonymous

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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186 views 0 answers

jihadio k jeeja · Answer 1 · 2018-01-03T13:58:19+0000

answered Jan 3, 2018 by jihadio k jeeja

No,its single phase

Is there a 220v three phase?

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