Multiple Choice Questions on Electrical Engineering and Practice Test 2
Last updated on October 31st, 2014 at 03:17 pm
There are 16 questions to be attended in 20 minutes. The questions are on Electrical Engineering. Read the study material before making an attempt so that you build your confidence in the subject. This is the second of the series of 10 questions paper that will appear before the RRB examination for SSE and JE to be held in Dec.
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There are 16 questions to be attended in 20 minutes. The questions are on Electrical Engineering. Read the study material before making an attempt so that you build your confidence in the subject. This is the first of the series of 10 questions paper that will appear before the RRB examination for SSE and JE to be held in Dec.
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The Answer Key:
Sr No Question Answer Remarks 1 The speed of electron in a Copper conductor when conducting called drift velocity is near about 0.5 cm/min Velocity of charge called drift velocity is very low but the effect of potential is felt at the speed of light. 2 What happens to the resistance of the wire with the increase in its radius reduces in inverse proportion to the square of the radium Resistance is inversely proportional to radius means more the radius, less the resistance 3 How is the resistance of a wire measured by a high frequency voltage source as compared to DC source more 4 Thevenin resistance is equal to Nortan Resistance 5 The formula for the heat produced in calorie for a case of work done by electric current is given by V*I*t/4.2 Heat produced is Work done divided by 4.2 to get the answer in Calories and by 4200 for getting answer in Kcal. 6 Specific Gravity of H2SO4 when fully charged is 1.265 7 The conjugate of -a+jb is (-a-jb) Conjugate of a+jb is a-jb where the j factor sign is reversed 8 DC series motor should always be started on load because Speed will be dangerously very high 9 If a transformer is applied with a square wave, the output waveform will be near to square wave You will get near to square wave in which high frequency harmonic will appear bypassing the lower frequecy harmonics 10 Fire Resistance property of cable is continue to maintain circuit integrity even during fire 11 Which of the following light source gives almost mono-chromatic light Sodium Vapour 12 A heat sink is used along with semi-conductor devices to transfer heat by the process conduction 13 Corona is observed only on Transmission lines of 132 kV Corona discharged will happen when there is a breakdown of air which is of the order of 30 kv/cm 14 Current transformation in a power transformer is in inverse proportion to the turns ratio Remember Np/Ns=Vp/Vs=Is/Ip 15 RCD stands for Residual Current Detector 16 Temperature coefficient of Copper is 1/235, calculate the change in a sample of copper if the temperature is raised by 235°C two times Rt = R0(1+235/235)=2R0
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Question 1 of 16
1. Question
If a transformer is applied with a square wave, the output waveform will be near to
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Question 2 of 16
2. Question
The formula for the heat produced in calorie for a case of work done by electric current is given by
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Question 3 of 16
3. Question
What happens to the resistance of the wire with the increase in its radius
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Question 4 of 16
4. Question
Specific Gravity of H2SO4 when fully charged is
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Question 5 of 16
5. Question
Temperature coefficient of Copper is 1/235, calculate the change in a sample of copper if the temperature is raised by 235oC
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Question 6 of 16
6. Question
The speed of electron in a Copper conductor when conducting called drift velocity is near about
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Question 7 of 16
7. Question
How is the resistance of a wire measured by a high frequency voltage source as compared to DC source
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Question 8 of 16
8. Question
Thevenin resistance is equal to
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Question 9 of 16
9. Question
The conjugate of -a+jb is
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Question 10 of 16
10. Question
DC series motor should always be started on load because
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Question 11 of 16
11. Question
Fire Resistance property of cable is
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Question 12 of 16
12. Question
Which of the following light source gives almost mono-chromatic light
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Question 13 of 16
13. Question
A heat sink is used along with semi-conductor devices to transfer heat by the process
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Question 14 of 16
14. Question
Corona is observed only on Transmission lines of
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Question 15 of 16
15. Question
Current transformation in a power transformer is
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Question 16 of 16
16. Question
RCD stands for
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impulse waveform will be generated when square waveform is applied to transformer primary…
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