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What makes an electromagnet stronger than a solenoid?
asked
Mar 14, 2018
by
anonymous
What makes an electromagnet stronger than a solenoid?
electromagnet
stronger
solenoid
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asked
Mar 14, 2018
by
anonymous
What are three ways you can increase the strength of an electromagnet?
What are three ways you can increase the strength of an electromagnet?
three
ways
increase
strength
electromagnet
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Mar 14, 2018
by
anonymous
What happens when you reverse the direction of the current in an electromagnet?
What happens when you reverse the direction of the current in an electromagnet?
Last answer:
When you reverse current direction in an electromagnet, the magnetic poles will also change.
reverse
direction
current
electromagnet
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Sep 4, 2018
by
anonymous
What is permanent magnet and electromagnet?
What is permanent magnet and electromagnet?
Last answer:
Permanent magnet: A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. As the name suggests, a permanent magnet is 'permanent'. ... an electric current passes through the coil. If the current is interrupted, the magnetism is lost.
permanent
magnet
electromagnet
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asked
Jul 21, 2019
by
anonymous
Explain the principle of operation of solenoid. State two parameters on which selection of solenoid is based.
Explain the principle of operation of solenoid. State two parameters on which selection of solenoid is based.
Last answer:
Diagram : Principle: A solenoid is a simple electromagnetic device that converts electrical energy directly into linear mechanical motion, but it has a very short stroke (length of movement), ... Parameters on which selection of solenoid is based1. Size 2. Flow capacity 3. Applied Voltage
solenoid
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Sep 4, 2018
by
anonymous
State any two applications of electromagnet.
State any two applications of electromagnet.
Last answer:
Applications of Electromagnet: Cranes, Motors, Generators, Transformers, Electromagnetic Relays, Circuit breakers, Traction, Measuring instruments, Electrical Bell etc.
applications
electromagnet
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asked
1 day
ago
by
anonymous
The internal rate of return (1) must be less than the interest rate if the firm is to invest. (2) makes the present value of profits equal to the present value of costs. (3) falls as the annual yield of an investment rises. (4) is equal to the market interest rate for all the firm’s investment.
The internal rate of return (1) must be less than the interest rate if the firm is to invest. (2) makes the present value of profits equal to the present value of costs. (3) falls as the annual yield of an investment rises. (4) is equal to the market interest rate for all the firm’s investment.
Last answer:
falls as the annual yield of an investment rises.
economics
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asked
Apr 29, 2018
by
anonymous
What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute?
What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute? A) 3600 HZ B) 60 Hz C) 120 Hz D) None of these
Last answer:
What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute? A) 3600 HZ B) 60 Hz C) 120 Hz D) None of these
frequency
alternator
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3 days
ago
by
anonymous
What makes an ecosystem ? (1) A living community and its environment (2) All the plants and animals of an area (3) Carnivores and herbivores of an area (4) Producers, consumers and decomposers in a particular locality
What makes an ecosystem ? (1) A living community and its environment (2) All the plants and animals of an area (3) Carnivores and herbivores of an area (4) Producers, consumers and decomposers in a particular locality
Last answer:
A living community and its environment
physical-geography
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asked
Apr 5, 2018
by
anonymous
What is the energy stored in the magnetic field at a solenoid of 40 cm long and 4 cm diameter wound with...
What is the energy stored in the magnetic field at a solenoid of 40 cm long and 4 cm diameter wound with 100 turns of wire carrying a current at 20A? (A) 0.705 Joule (B) 0.789 Joule (C) 0.587 Joule (D) 0.658 Joule
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asked
Apr 9, 2018
by
anonymous
If an energy meter disc makes 10 revolutions in 100 seconds when a load of 450W is connected to it, the...
If an energy meter disc makes 10 revolutions in 100 seconds when a load of 450W is connected to it, the meter constant in revolutions per kWh is A) 1000 B) 500 C) 1600 D) 800
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asked
Apr 5, 2018
by
anonymous
An energy meter has a constant of 600 rev/kWh. If the meter makes 10 revolutions in 20 s, ...
An energy meter has a constant of 600 rev/kWh. If the meter makes 10 revolutions in 20 s, what is the load in kW? (A) 0.75 kW (B) 1.5 kW (C) 3 kW (D) 6 kW
Last answer:
1.5 kW
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asked
Jul 25, 2020
by
anonymous
An alloy of Iron - Chromium and Nickel makes what
An alloy of Iron - Chromium and Nickel makes what
Last answer:
Stainless Steel
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asked
Sep 2, 2018
by
anonymous
What is solenoid valve ? Explain its working with the help of diagram.
What is solenoid valve ? Explain its working with the help of diagram.
Last answer:
Solenoid valve is an electromagnetic valve used to control flow of fluid such as air or oil. It consists of a solenoid assembly and valve assembly. When current passes through solenoid, the ... remains closed. Solenoid valves are used in hydraulic and pneumatic circuits to regulate air/oil flow.
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asked
Mar 29, 2018
by
anonymous
Core of an electromagnet should have
Last answer:
Core of an electromagnet should have low coercivity, high susceptibility.
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asked
Apr 10, 2018
by
anonymous
Composition is a stronger form of which of the following?
Composition is a stronger form of which of the following? (1) Aggregation (2) Encapsulation (3) Inheritance (4) All of the above.
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asked
Apr 29, 2018
by
anonymous
What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016
What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these
Last answer:
What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these
power
factor
single
phase
watt
meter
operating
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asked
16 hours
ago
by
anonymous
Internal economies (1) arise when there is expansion in an industry. (2) arise in an economy as it makes progress. (3) accrue to a firm when it expands its output. (4) arise when there is expansion in internal trade.
Internal economies (1) arise when there is expansion in an industry. (2) arise in an economy as it makes progress. (3) accrue to a firm when it expands its output. (4) arise when there is expansion in internal trade.
Last answer:
arise when there is expansion in an industry.
economics
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asked
Mar 28, 2018
by
anonymous
An 8 bit converter type A/D converter makes at least 8000conversions/sec. The clock frequency used is
Last answer:
An 8 bit converter type A/D converter makes at least 8000conversions/sec. The clock frequency used is 2MHz.
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1
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asked
Jan 10
by
anonymous
An industry employed 1200 men and 800 women and the average salary was Rs 51 per day. If a woman got Rs 10 less than a man , then what are their daily salary?(mens and women respectively) A) men Rs 25 and women Rs 35 B) men Rs 45 and women Rs 55 C) men Rs 35 and women Rs 25 D) men Rs 55 and women Rs 45
An industry employed 1200 men and 800 women and the average salary was Rs 51 per day. If a woman got Rs 10 less than a man , then what are their daily salary?(mens and women respectively) A) men Rs 25 and women Rs 35 B) men Rs 45 and women Rs 55 C) men Rs 35 and women Rs 25 D) men Rs 55 and women Rs 45
Last answer:
D) Let the daily salary of man be Rs’x’ Then the daily salary of a women = Rs (x-100 Now 1200x + 800(x-10) = 51 *(1200+800) 1200x+800x -8000 = 51*2000 2000x = 102000+8000 =110000 X=55 Therefore mens daily salary Rs 55 and womens daily salary Rs 45
average
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asked
Jan 9
by
anonymous
In a competitive examination in Pondicherry, 18% candidates got selected from the total appeared candidates. Tamilnadu and Pondicherry had an equal number of candidates appeared and in Tamilnadu 21% candidates got selected with 240 more than the candidates got selected in Pondicherry. What was the number of candidates appeared from each State? a) 25000 b) 84000 c) 24000 d) 700000 e) 9800
In a competitive examination in Pondicherry, 18% candidates got selected from the total appeared candidates. Tamilnadu and Pondicherry had an equal number of candidates appeared and in Tamilnadu 21% candidates got selected with 240 more than the candidates got selected in Pondicherry. What was the number of candidates appeared from each State? a) 25000 b) 84000 c) 24000 d) 700000 e) 9800
Last answer:
Answer: C Pondichery and Tamilnadu had an equal number of candidates appeared In Pondicherry, 18% candidates got selected from the total appeared candidates In tamilnadu, 21% candidates ... > total appeared candidates in pondicherry = total appeared candidates in tamilnadu = 24000
percentage
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asked
Jan 9
by
anonymous
Two students appeared at an examination. One of them secured 18marks more than the other and his marks was 72% of the sum of their marks. What are the marks obtained by them? a) 12.5,23.3 b) 26.7,16.0 c) 13.3,14.2 d) 11.45, 29.45 e) 29.8,15.4
Two students appeared at an examination. One of them secured 18marks more than the other and his marks was 72% of the sum of their marks. What are the marks obtained by them? a) 12.5,23.3 b) 26.7,16.0 c) 13.3,14.2 d) 11.45, 29.45 e) 29.8,15.4
Last answer:
Answer: D Let the marks secured by them be x and (x + 18) Then sum of their marks = x + (x + 18) = 2x + 18 Given that (x + 18) was 72% of the sum of their marks =>(x+18) = 72/100(2x+18) => ... 11x = 126 x = 11.45 Then (x + 18) = 11.45 + 18 = 29.45 Hence their marks are 11.45 and 29.45
percentage
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asked
Jan 7
by
anonymous
Shaquille O’ Neal is a 60% career free throw shooter, meaning that he successfully makes 60 free throws out of 100 attempts on average. What is the probability that he will successfully make exactly 6 free throws in 10 attempts? (A) 0.2508 (B) 0.2816 (C) 0.2934 (D) 0.6000
Shaquille O’ Neal is a 60% career free throw shooter, meaning that he successfully makes 60 free throws out of 100 attempts on average. What is the probability that he will successfully make exactly 6 free throws in 10 attempts? (A) 0.2508 (B) 0.2816 (C) 0.2934 (D) 0.6000
Last answer:
Correct option is (A).
gate
ee
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8
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1
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asked
Sep 4, 2018
by
anonymous
Write one application of each: i) Permanent Magnet ii) Electromagnet
Write one application of each: i) Permanent Magnet ii) Electromagnet
Last answer:
i) Applications of Permanent Magnet: 1) Field of DC motors 2) Tacho-generators 3) In stepper motors. 4) Field of two wheeler and car dynamo 5) In magnetic therapy 6) ... Motors, Generators, Transformers, Electromagnetic Relays, Circuit breakers, Traction, Measuring instruments, Electrical Bell etc.
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1
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asked
3 days
ago
by
anonymous
Which of the following rivers flows from East to West and makes an estuary? (1) Yamuna (2) Krishna (3) Narmada (4) Godavari
Which of the following rivers flows from East to West and makes an estuary? (1) Yamuna (2) Krishna (3) Narmada (4) Godavari
Last answer:
Narmada
geography-of-india
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1
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asked
3 days
ago
by
anonymous
Which of the following rivers makes an estuary? (1) Cauvery (2) Krishna (3) Narmada (4) Ganga
Which of the following rivers makes an estuary? (1) Cauvery (2) Krishna (3) Narmada (4) Ganga
Last answer:
Narmada
geography-of-india
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asked
Apr 10, 2018
by
anonymous
An open-loop system is better than a closed-loop system in terms of
An open-loop system is better than a closed-loop system in terms of (a) Accuracy (b) Stability (c) Noise reduction (d) Sensitivity
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51
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0
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asked
Mar 25, 2018
by
anonymous
A ferrite core has less eddy current loss than an iron core because?
A ferrite core has less eddy current loss than an iron core because?
Last answer:
A ferrite core has less eddy current loss than an iron core because ferrites have high hysteresis.
ferrite
core
less
eddy
current
loss
iron
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281
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1
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asked
Sep 2, 2018
by
anonymous
Draw the symbol and state the applications of : 1) Push button switch 2) Selector switch 3) Solenoid valve 4) Limit switch
Draw the symbol and state the applications of : 1) Push button switch 2) Selector switch 3) Solenoid valve 4) Limit switch
Last answer:
1) Push Button It is used in start-stop control circuit 2) Selector Switch : It is used to select one input out of many, 3) Solenoid valve: is used to control flow of fluid such as air, pressurized oil. 4) Limit switch: It is used to detect presence of object
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63
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1
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asked
Oct 2, 2018
by
anonymous
Name the process that causes potential difference across a solenoid due to the movement of a nearby magnet
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351
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0
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asked
May 18, 2018
by
anonymous
The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper
The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper tube of 60 mm diameter is (A) 3.2 µH (B) 3.2 mH (C) 32.0 mH (D) 3.2 H
Last answer:
The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper tube of 60 mm diameter is 32.0 mH
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asked
Apr 23, 2018
by
anonymous
One single-phase energy meter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter...
One single-phase energy meter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter constant is 400 rev/kWh. The power factor of the load is
Last answer:
One single-phase energy meter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter constant is 400 rev/kWh. The power factor of the load is 0.8
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132
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asked
Apr 11, 2018
by
anonymous
A meter whose constant is 600 revolutions/kWh makes 5 revolutions in 20 seconds. Calculate the load in kW.
A meter whose constant is 600 revolutions/kWh makes 5 revolutions in 20 seconds. Calculate the load in kW. (1) 0.5 kW (2) 1 kW (3) 1.5 kW (4) 2 kW
Last answer:
1.5 kW
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219
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1
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asked
Apr 1, 2018
by
anonymous
A centre zero ammeters connected in the rotor circuit of a 6-pole 50 Hz induction motor makes 30...
A centre zero ammeters connected in the rotor circuit of a 6-pole 50 Hz induction motor makes 30 oscillations in one minute. The rotor speed is
Last answer:
A centre zero ammeters connected in the rotor circuit of a 6-pole 50 Hz induction motor makes 30 oscillations in one minute. The rotor speed is 990.
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87
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1
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asked
Jul 24, 2020
by
anonymous
Saponification is the process that makes what common product
Saponification is the process that makes what common product
Last answer:
Soap
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7
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1
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asked
Apr 10, 2018
by
anonymous
For applications requiring speed ratio other than 2 : 1, the speed control of an induction motor can be...
For applications requiring speed ratio other than 2 : 1, the speed control of an induction motor can be effected by varying the number of stator poles employing (1) multiple stator winding (2) pole amplitude modulation technique (3) consequent pole technique (4) Any of these
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60
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asked
Mar 29, 2018
by
anonymous
The attraction capacity of electromagnet will increase if the
Last answer:
Atrraction capacity will increase if supply current is increased.
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91
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2
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2 days
ago
by
anonymous
The income elasticity of demand being greater than one, the commodity must be (1) a necessity (2) a luxury (3) an inferior good (4) None of these
The income elasticity of demand being greater than one, the commodity must be (1) a necessity (2) a luxury (3) an inferior good (4) None of these
Last answer:
a luxury
economics
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asked
Jan 11
by
anonymous
An outgoing batch of students wants to gift a PA system worth Rs 4,200 to their school. If the teachers, offer to pay 50% more than the students and an external benefactor gives three times the teacher's contribution, then how much should the teachers donate? A) Rs 600 B) Rs 840 C) Rs 900 D) Rs 1,200 E) NONE
An outgoing batch of students wants to gift a PA system worth Rs 4,200 to their school. If the teachers, offer to pay 50% more than the students and an external benefactor gives three times the teacher's contribution, then how much should the teachers donate? A) Rs 600 B) Rs 840 C) Rs 900 D) Rs 1,200 E) NONE
Last answer:
Answer: C The ratio of the share students : teacher: benefactor=1:1.5 : 4.5 So the proportion to teacher's share = 1.5/7 Hence, the teachers would donate 1.5/7×4200=Rs 900
ratio-and-proportion
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asked
Jan 9
by
anonymous
A candidate scoring 50% in an examination fails by 60 marks , while another candidate scores 75 % mark, gets 40 marks more than the minimum pass marks . Find the minimum pass mark. a) 125 b) 220 c) 140 d) 260 e) 298
A candidate scoring 50% in an examination fails by 60 marks , while another candidate scores 75 % mark, gets 40 marks more than the minimum pass marks . Find the minimum pass mark. a) 125 b) 220 c) 140 d) 260 e) 298
Last answer:
Answer: B Let x be the maximum marks, Then (50% of x)+60 = (75% of x)-40 x/2 +60 = 3x/4 -20 60+20 = 3x/4 – x/ 2 X=320 Hence maximum marks = 320 Minimum pass marks = 320/2 + 60 = 220
percentage
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asked
Aug 2, 2020
by
anonymous
Imagine a possibility of an emergency evacuation scenario in a domestic household in India. The height at which the inside latch of the exit-door should be installed is to be finalised. It is required to disallow opening of the door accidentally by children. Which option will determine the height at which the latch should be fixed? Assume the height of the tallest child is lower than that of the shortest adult.
Imagine a possibility of an emergency evacuation scenario in a domestic household in India. The height at which the inside latch of the exit-door should be installed is to be finalised. It is required to disallow opening of the door accidentally by children. Which option will determine the height at which the latch should be ... adult in the family. C. The average height of the child in the family. D. The average height of the tallest adult male and tallest adult female.
Last answer:
B
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1
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asked
May 22, 2020
by
anonymous
State why a transformer always have an efficiency of more than 90%.
State why a transformer always have an efficiency of more than 90%.
Last answer:
As transformer is static device with no moving parts, the losses due to friction & windage are completely absent. Hence transformer has efficiency of more than 90%.
transformer
efficiency
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asked
Apr 26, 2018
by
anonymous
An FET is a better chopper than a BJT because it has
An FET is a better chopper than a BJT because it has (A) lower offset voltage (B) higher series ON resistance (C) lower input current (D) higher input impedance
Last answer:
An FET is a better chopper than a BJT because it has lower offset voltage
fet
bjt
chopper
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539
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asked
Apr 10, 2018
by
anonymous
Which of the following applies to a class rather than an object?
Which of the following applies to a class rather than an object? (1) Query (2) Scope (3) Update (4) Constructor
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asked
Jun 4, 2020
by
anonymous
State the working principle of solenoid valve with neat sketch
State the working principle of solenoid valve with neat sketch
Last answer:
Principle of Operation: * A solenoid is used for translating ON/OFF electrical signals to ON/OFF mechanical movements and normally used as a linear actuator. * As shown in fig (b) above, ... * When the voltage is applied to the solenoid frame magnetic field is produced in the solenoid frame.
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asked
Mar 29, 2018
by
anonymous
Main causes of noisy solenoid are
Last answer:
Main causes of noisy solenoid are strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force, uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts.
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Aug 25, 2019
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anonymous
State the four methods of laying of cable. State precautions while laying of underground cable in the situation : (i) Minimum clearance between cable and water pipe line when running in parallel. (ii) Minimum clearance between cable and water pipe line when running in parallel. (iii) If cable is laid through pipe what should be diameter of pipe. (iv) When more than one cable is to be laid in the same trench, what should be minimum spacing between two cables ?
State the four methods of laying of cable. State precautions while laying of underground cable in the situation : (i) Minimum clearance between cable and water pipe line when running in parallel. (ii) Minimum clearance between cable and water pipe line when running in parallel. (iii) If cable is laid through pipe what should be diameter of pipe. (iv) When more than one cable is to be laid in the same trench, what should be minimum spacing between two cables ?
Last answer:
(i) Minimum clearance between cable and water pipe line when running in parallel:- 0.5 mtr. (ii) Minimum clearance between cable and water pipe line when running in parallel:- 0.5 mtr ... should be minimum spacing between two cables :- Then minimum 30 cm spacing is provided between 2 cables
laying
cable
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asked
4 hours
ago
by
anonymous
The existence of a Parallel Economy or Black Money (1) makes the economy more competitive (2) makes the monetary policies less effective (3) ensures a better distribution of income and wealth (4) ensures increasing productive investment
The existence of a Parallel Economy or Black Money (1) makes the economy more competitive (2) makes the monetary policies less effective (3) ensures a better distribution of income and wealth (4) ensures increasing productive investment
Last answer:
makes the monetary policies less effective
economics
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asked
Jan 10
by
anonymous
A Shop makes a profit of Rs. 85000 of which 15% as paid as taxes. If the rest is divided among the partners A,B,C in the ratio 8:7:6 then the total share of A and B is A) 54780 B) 51607 C) 56803 D) None
A Shop makes a profit of Rs. 85000 of which 15% as paid as taxes. If the rest is divided among the partners A,B,C in the ratio 8:7:6 then the total share of A and B is A) 54780 B) 51607 C) 56803 D) None
Last answer:
Answer: B) Profit by company =Rs.85000 After paying tax of 15% Remaining profit =85000*85/100 =Rs 72250 Profit ratio of X, Y, Z =8:7:6 Total share of X& Y =72250*15/21 =Rs.51,607
partnership
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Jan 10
by
anonymous
A taxi driver makes a profit of 25% on every trip when he carries 4 passengers and the price of petrol is Rs. 35 a litre. Find the approximate % profit for the same journey if he goes for 5 passengers per trip and the price of petrol reduces to Rs. 28 litres?
A taxi driver makes a profit of 25% on every trip when he carries 4 passengers and the price of petrol is Rs. 35 a litre. Find the approximate % profit for the same journey if he goes for 5 passengers per trip and the price of petrol reduces to Rs. 28 litres?
Last answer:
When 4 passengers income was 4x Expense= Rs.35. Profit =25% of 35+35= Rs.43.75 That means his earning is Rs.44.775.so that per passenger fare must be Rs.10.93 When 5 passengers earning = 10.99x5=Rs.54.68 Expense =Rs.28 Profit = 95.28 % approx.
profit-and-loss
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Jan 10
by
anonymous
By mixing two brands of dal and selling the mixture at the rate of Rs.354 per kg a shopkeeper makes a profit of 36%. If to every 4 kg of one brand costing Rs.400 per kg, 6kg of other brand is added. Then how much per kg does the other brand cost?
By mixing two brands of dal and selling the mixture at the rate of Rs.354 per kg a shopkeeper makes a profit of 36%. If to every 4 kg of one brand costing Rs.400 per kg, 6kg of other brand is added. Then how much per kg does the other brand cost?
Last answer:
Let the cost price of other brand be Rs x' per kg cost price of 10 kg = Rs (4 * 400 + 6 * x) = Rs (1600 +6x) Selling price of 10 kg = Rs (10 * 354 ) = Rs.3540 Therefore 3540 -(1600 + 6x)/ ... 6x/1600 + 6x = 0.36 1940 - 6x = 576 + 2.16x x=167.15 so the cost of other brand = Rs.167.15
profit-and-loss
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