Test Your Knowledge - Free MCQ PRACTICE
by Saksham Chaudhry : Paschim Vihar, New Delhi 110063 T: 1142316457, 9810570740
electrician
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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. On removing cores of transformer, the production of magnetic flux :
A. Is reduced 
B. Is increased 
C. Remains the same 
D. None of these 

2. The objective of earthing or grounding is :
A. To provide as low resistance as possible to the ground 
B. To provide as high resistance as possible to the ground 
C. To provide flow of positive, negative, and zero sequence currents 
D. None of these 

3. A closed loop control system is basically different from open loop control system due to ?
A. Feedback 
B. Servomechanism 
C. Actuating signal 
D. Error signal 

4. Check list for Job Safety Analysis (JSA) consists of
A. Men, machine, material, tools 
B. Work area, material, machine, tools 
C. Men, machine, work area, tools 
D. Men, work area; Material, tools 

5. Armature winding of a series motor is excited
A. Resistively 
B. Conductively 
C. Inductively 
D. None of these 

6. Lux is the unit of
A. Luminous flux 
B. Luminous intensity 
C. Illumination 
D. Luminance 

7. The control element of an SCR is ………….
A. Cathode 
B. Anode 
C. Anode supply 
D. Gate 

8. Torque-speed characteristic of a series motor is
A. Parabola 
B. Rectangular hyperbola 
C. Linear 
D. None of these 

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

10. Load torque decreases with increase in speed in case of :
A. Lathes, boring machines, milling machines 
B. Hoist winches machine toolfeed mechanism 
C. Blowers, fans,centrifugal pumps 
D. A and B 

11. An amplifier can work as oscillator when its loop gain becomes :
A. Infinity 
B. Zero 
C. -1 
D. +1 

12. Lamp is provided with a relector in order to :
A. Avoid glare 
B. Provide better illumination 
C. Protect the lamp 
D. All these 

13. A wire suspended vertically from one of its ends is stretched by attaching a weight of 100N to its lower end; What is the elastic potential energy stored in the wire, if the weight stretches the wire by 1.5 mm?
A. 5 Χ 10-2 J 
B. 10-3 J 
C. 2.5 Χ 10-3 J 
D. 7.5 Χ 10-2 J 

14. What gives a diversion of 90 degree in the turn of a conduit?
A. Couplers 
B. Elbow 
C. Bends 
D. Tees 

15. Any physical system which does not automatically correct for variation in its output, is called ?
A. Open loop system 
B. Closed loop system 
C. Unstable system 
D. None of these 

16. For induction motors
A. Should be essentially a constant speed motor 
B. Its speed reduces to some extent with increase in load 
C. Does not need to be synchronized 
D. All of these 

17. 7BF16 = __________ 2
A. 0111 1011 1110 
B. 0111 1011 1111 
C. 0111 1011 0111 
D. 0111 1011 0011 

18. The flux under the unshaded pole of shaded pole induction motor
A. Is in equal phase of flux under the shaded pole 
B. Lags the flux under the shaded pole 
C. Leads the flux under the shaded pole 
D. None of these 

19. Increase in the number of commutator segments of dc machine results in
A. Decrease in the total output power 
B. Smoothening of the shape of output dc wave 
C. Increase in the magnitude of output voltage 
D. Increase in the total output power 

20. The following is indirect cost of accident
A. Money paid for treatment of worker 
B. Compensation paid to worker 
C. Cost of lost time of injured worker 
D. All these 

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