Multiple Choice Questions on Electrical Engineering and Practice Test 5
Last updated on October 31st, 2014 at 03:15 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 fifth 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 equation of an alternating voltage is given as V=224 Sin440t; what is its average value 142.6 Average value is given as 2*224/3.14=142.67 2 With the increase in temperature, the resistance of a conducting material generally increases 3 The total inductance of 10 inductors of 1 mH each when connected in parallel will be 0.1 mH 4 The Principle behind the thermo couple is Seeback Effect 5 What remains constant inside a sphere of radius r with Q charge on the surface Potential 6 A back up time for 100 Ah battery of 12 Volt feeding a load of 100 W at 0.9 pF and 80% efficiency is more than 8 hours 100x12x0.9×0.8/100=8.64 hrs 7 What kVAR is required to improve the power factor of a 10 kW system of (1/√2) to unity? 10 kVAR kVAR=kW(Tanφ1-Tanφ2); cos⁻(1/√2)=45° and Tan 45°=1 and Tan 0 = 0; therefore it is 10 kVAR 8 The motor which can be operated at leading as well as lagging power factor is Synchronous Motor By varying the field excitation, the motor can be operated with lagging or leading power factor 9 Skin effect is observed in transmission of AC voltage Skin affect is observed in AC only 10 Semi-conducting tape is used in MV and HV cable for the purpose of Uniform distribution of electric field Semi-conducting tape results uniform distribution of electric field 11 What is the danger of strobe affect of fluorescent light? illusion of the speed of the rotating body at slow speed or stationary 12 The three terminals of IGBT are called emitter, collector and gate 13 In long transmission lines, there is a phenomenon when the voltage at the receiving end is more than the sending end. What is this effect called? Ferranti Effect during charging or low load on a transmission lines, the voltage drop due to system LC of the transmission when added to input voltage, the voltage increases 14 The efficiency of transformer is maximum at that load on which Copper losses are equal to core losses 15 What is the approximate value of earth planet capacitance? near 700 micro farad 16 A 1000W heater working for 15 minutes at an efficiency of 90% will raise the temperature of 10 litre of water from 25°C to about 46 1000*0.9*15*60/4.2=10*1000*(t-25);
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Question 1 of 16
1. Question
The equation of an alternating voltage is given as V=224 Sin440t; what is its average value
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Question 2 of 16
2. Question
With the increase in temperature, the resistance of a conducting material generally
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Question 3 of 16
3. Question
The total inductance of 10 inductors of 1 mH each when connected in parallel will be
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Question 4 of 16
4. Question
The Principle behind the thermo couple is
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Question 5 of 16
5. Question
What remains constant inside a sphere of radius r with Q charge on the surface
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Question 6 of 16
6. Question
A back up time for 100 Ah battery of 12 Volt feeding a load of 100 W at 0.9 pF and 80% efficiency is
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Question 7 of 16
7. Question
What kVAR is required to improve the power factor of a 10 kW system of (1/Ã2) to unity?
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Question 8 of 16
8. Question
The motor which can be operated at leading as well as lagging power factor is
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Question 9 of 16
9. Question
Skin effect is observed in transmission of
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Question 10 of 16
10. Question
Semi-conducting tape is used in MV and HV cable for the purpose of
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Question 11 of 16
11. Question
What is the danger of strobe affect of fluorescent light?
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Question 12 of 16
12. Question
The three terminals of IGBT are called
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Question 13 of 16
13. Question
In long transmission lines, there is a phenomenon when the voltage at the receiving end is more than the sending end. What is this effect called?
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Question 14 of 16
14. Question
The efficiency of transformer is maximum at that load on which
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Question 15 of 16
15. Question
What is the approximate value of earth planet capacitance?
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Question 16 of 16
16. Question
A 1000W heater working for 15 minutes at an efficiency of 90% will raise the temperature of 10 litre of water from 25¡C to about
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