Multiple Choice Questions on Electrical Engineering and Practice Test 6
Last updated on October 31st, 2014 at 02:48 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 sixth 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 copper wire of length a cm and diameter d mm is applied with a voltage V across it. The drift velocity is noted to Vd. If the diameter is increased to 2d, what will be the drift velocity? Vd Drift velocity depends on the property of the material and not any physical value. 2 What happens to the value of temperature coefficient at higher temperature? decreases If temperature coefficient is α0 and αt at 0 and t degree centigrade, than αt=α0/(1+α0*t). The temperature coefficient is always defined at a specific temperature. 3 The stored energy in an inductor is given by (½)LI2 4 The basic principle of hall effect sensor is that when current is flowing through a thin sheet of conducting material and magnetic field is applied in other direction, a electric potential is produced in the third direction 5 Unit of capacitance is Farad and given by coulomb/Volt Q=CV or C = Q/V or Coulomb/volt 6 The most important advantage of VRLA battery is No mounting condition The battery is sealed and can be mounted on any base 7 Three phase supply 200 V having an impedance 20 ohms got connected in series forming a loop. What current will flow in the loop? Nil The resultant voltage of three phase balanced voltage is zero i.e. a²+a+1=0 8 A 4 pole 50 Hz 3 phase induction motor is operating at 5% slip. What is its speed of rotation? 1425 Ns= 120*50/4= 1500 rpm; Nr= (1-s)Ns; 1425 rpm 9 ACSR stands for Aluminium conductor streel reinforced 10 Thermo setting plastic materials are those which contain polymers that cross-link together during the curing process to form an irreversible chemical bond. 11 Wheel of a traction wheel on a rail slips when tractive effort applied is more than adhesive weight 12 GTO stand for Gate turnoff thyristor 13 One unit of energy by different state is equal to consumption of one kWh or one kVAh There are states which charges based on 1 kVAh on others on the basis of 1kWh 14 Humming sound in a transformer is the result of 0 Varying nature of flux results in magnetisation and de-magnetisation of core resulting core stamping moving 15 What is Step voltage? It is the potential difference between steps of a being on the earth when fault current is flowing through it 16 1000 Kg/sec of water falling a water head of 100 meter at an efficiency of 80% will be able to produce electric power equal to 80 kW mgh is potential energy and thus 0.8*1000*100 W or 80 kW
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- Answered
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Question 1 of 16
1. Question
A copper wire of length a cm and diameter d mm is applied with a voltage V across it. The drift velocity is noted to Vd. If the diameter is increased to 2d, what will be the drift velocity?
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Question 2 of 16
2. Question
What happens to the value of temperature coefficient at higher temperature?
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Question 3 of 16
3. Question
The stored energy in an inductor is given by
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Question 4 of 16
4. Question
The basic principle of hall effect sensor is that
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Question 5 of 16
5. Question
Unit of capacitance is Farad and given by
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Question 6 of 16
6. Question
The most important advantage of VRLA battery is
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Question 7 of 16
7. Question
Three phase supply 200 V having an impedance 20 ohms got connected in series forming a loop. What current will flow in the loop?
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Question 8 of 16
8. Question
A 4 pole 50 Hz 3 phase induction motor is operating at 5% slip. What is its speed of rotation?
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Question 9 of 16
9. Question
ACSR stands for
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Question 10 of 16
10. Question
Thermo setting plastic materials are those which
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Question 11 of 16
11. Question
Wheel of a traction wheel on a rail slips when
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Question 12 of 16
12. Question
GTO stand for
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Question 13 of 16
13. Question
One unit of energy by different state is equal to consumption of
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Question 14 of 16
14. Question
Humming sound in a transformer is the result of
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Question 15 of 16
15. Question
What is Step voltage?
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Question 16 of 16
16. Question
1000 Kg/sec of water falling a water head of 100 meter at an efficiency of 80% will be able to produce electric power equal to
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