Test Your Knowledge - Free MCQ PRACTICE
by Saksham Chaudhry : Paschim Vihar, New Delhi 110063 T: 1142316457, 9810570740
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A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.
For each of the following multiple choice questions, choose the most appropriate answer :

1. What is used to take diversion from the main line either to the switch points at light points?
A. Couplers 
B. Elbow 
C. Bends 
D. Tees 

2. Permanent magnet are manufactured by
A. Copper sulphate 
B. Iron and cobalt 
C. Cobalt and nickel 
D. ALNICO 

3. A repulsion start induction run motor runs as a squirrel-cage motor only when :
A. Compensating winding is short circuited through the brushes 
B. Cummutator is short circuited 
C. Squirrel cage winding is provided 
D. Slip rings are short circuited 

4. In which method will the phase or line conductor be looped at the switch box and neutral conductors at the point outlets
A. Looping in method using 2 plate ceiling roses and switches 
B. Looping back method  
C. Joint box method 
D. Looping in method using 2 plate ceiling roses and switches 

5. In the commutation process in a dc machine, which of the following quantity reverses?
A. Both voltage and current 
B. Voltage 
C. Current 
D. None of these 

6. An SCR is made of ………….
A. Germanium 
B. Silicon 
C. Carbon 
D. None of these 

7. Epoxy compound used with underground cable does not need :
A. Heating 
B. Cooling 
C. Stirring 
D. Mixing 

8. All rotation electrical machines have
A. Rotating armature and fixed field 
B. Rotating field and fixed armature 
C. A and B 
D. None of these 

9. Which of the following power plants is the most reliable ?
A. Diesel 
B. Hydro-electric 
C. Steam 
D. Tidal 

10. Which particles act as a current carrier in a metallic conductor?
A. Electrons and ions 
B. Ions and defect electrons 
C. Electrons and defect electrons 
D. Only electrons 

11. When an alternator is connected to infinite bus bar, change in excitation for alternator will
A. Neither terminal voltage will get affected nor power factor 
B. Change the terminal voltage and power factor both 
C. Affect only power factor and terminal voltage remains unaffected 
D. Affect only terminal voltage and power factor remains unaffected 

12. Selection of the type of conduit depends upon the :
A. Type of location, outdoor or indoor 
B. Type of atmosphere and estimated cost 
C. Expected working temperature & allowable weight of conduit runs 
D. All these 

13. Effect of armature flux on the main flux in a DC motor is that
A. It makes distribution of the flux density across both sections unequal 
B. It inclines lines of force through the air gap such that they do not remain radial 
C. A and B 
D. None of these 

14. CAT 5 is used for :
A. LAN 
B. Internet 
C. Current 
D. Voltage 

15. When SCR is OFF, the current in the circuit is …………….
A. Exactly zero 
B. Small leakage current 
C. Large leakage current 
D. None of these 

16. Location of a surge tank in a hydroelectric power station is near :
A. Turbine 
B. Tail race 
C. Reservoir 
D. Dam 

17. Slip ring induction motor has
A. Low starting torque 
B. Medium starting torque 
C. High starting torque 
D. None of these 

18. If a 3 phase alternator is short circuited at its terminal, then the initial value of short circuit current will be limited by
A. Synchronous reactance 
B. Transient reactance 
C. Sub transient reactance 
D. All of the above 

19. The basic elements of an electric drive are :
A. Electric motor ,the transmission and control system 
B. The transmission and control system 
C. Electric motor and conversion equipment 
D. Electric motor and the transmission system 

20. Which of the following wiring systems is commonly used for light/fan load in domestic and commercial buildings?
A. Casing capping wiring 
B. TRS wiring 
C. Lead sheathed wiring 
D. PVC wiring 

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