Multiple Choice Questions on Electrical Engineering and Practice Test 3
Last updated on October 31st, 2014 at 03:16 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 third 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 A 6A of current can also be written as 6 coulomb/secs current is given by rate of flow of charge 2 Unit of Specific Resistivity is Ohm-meter Specific Resistance = Resistance*Area of Crossection/length of the conductor 3 Time constant of RL circuit is given by R/L 4 Piezoresistive sensors are used to detect pressure 5 What is hydro power potential of a Water failing from a reservoir at the rate of 5 m³/sec from a height of 20 meters at an efficiency of 80%? 785 W=ηQgH = 0.8*5000*9.81*20 W = 784.5 6 High Specific Gravity battery has the disadvantage of Less life 7 Three AC voltage source of 15/0°, 12/35° and 22/-64° are connected in parallel, what the resultant voltage? (36.8/-20.5°) It may be difficult to find the correct answer, but if draw the polar diagram, the angle will immediately tell the right option 8 The frequency of rotor current in a 50 Hz three phase induction motor is about 2 Hz The frequency of rotor current will be at slip frequency and considering slip of 4%, the frequency will be 2 Hz 9 A 60 Hz, 3 φ 750/400 is connected with 50 Hz 3 φ 400 V supply, what is the output voltage 213 Lower frequency will not effect the transformation ouput unless the flux produces goes to saturation but will effect hysteresis and eddy losses 10 How fire retardant property is achieved? by adding hydroxide material 11 Color rendering Index is the term used in illumination engineering to represent the appearance of true color when light falls on the object 12 This is not a methods to turn off a SCR are reverse biasing of gate 13 Transmission at High voltage is chosen To reduce transmission losses 14 Magnetising current in a transformer lags the voltage by about 90 degree Magnetising current is produced by the inductance of the transformer and therefore the current lags near to 90 degree 15 RCD detects the difference of current between phase and neutral It measures the difference of current between phase and neutral; and if there is a difference means, the current has leaked into earth. 16 A resister value prescribed is 100Ωplus/minus 5%, what value will be taken for the purpose of calculating the protection towards heating 105 Higher resistance will give higher heating effect thus protection to be considered for worst condition
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Question 1 of 16
1. Question
Three AC voltage source of 15∠00, 12∠350 and 22∠-640 are connected in series, what the resultant voltage?
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Question 2 of 16
2. Question
A 6A of current can also be written as
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Question 3 of 16
3. Question
Unit of Specific Resistivity is
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Question 4 of 16
4. Question
Time constant of RL circuit is given by
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Question 5 of 16
5. Question
Piezoresistive sensors are used to detect
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Question 6 of 16
6. Question
What is hydro power potential of a Water failing from a reservoir at the rate of 5 meter cube/sec from a height of 20 meters at an efficiency of 80%?
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Question 7 of 16
7. Question
High Specific Gravity battery has the disadvantage of
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Question 8 of 16
8. Question
The frequency of rotor current in a 50 Hz three phase induction motor is about
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Question 9 of 16
9. Question
A 60 Hz, 3 phase 750/400 V transformer is connected with 50 Hz 3 phase 400 V supply, what is the output voltage
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Question 10 of 16
10. Question
How fire retardant property is achieved?
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Question 11 of 16
11. Question
Color rendering Index is the term used in illumination engineering to represent the
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Question 12 of 16
12. Question
This is not a methods to turn off a SCR are
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Question 13 of 16
13. Question
Transmission at High voltage is chosen
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Question 14 of 16
14. Question
Magnetising current in a transformer
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Question 15 of 16
15. Question
RCD detects the difference of
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Question 16 of 16
16. Question
A resister value prescribed is 100½plus/minus 5%, what value will be taken for the purpose of calculating the protection towards heating
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