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 the percentage of carbon in plain carbon steel?
A. 60 to 80%
B. Less than 1.7%
C. Less than 7%
D. None of the above
2. Varnish coating is done on winding in order to :
A. Increase insulation of windings
B. Make windings vibration less
C. Provide an additional insulation layer on the windings
D. All these
3. An SCR can be used
A. as static conductor
B. for power control
C. for speed control of dc shunt motor
D. all of these
4. Which conduit wiring system done inside the concrete plaster or wall?
A. Surface
B. Concealed
C. Recessed
D. B and C
5. In dc generators, brushes remain in contact with the conductors which lie
A. under south pole
B. under north pole
C. arbitrarily
D. in the interpolar region
6. The modulus of elasticity is dimensionally equivalent to
A. Strain
B. Stress
C. Surface tension
D. Poissons ratio
7. Most suitable way of providing electric supply to a multistorey building is by means of :
A. Rising main
B. Overhead line
C. Paper insulated cable
D. PVC insulated armoured cable
8. The highest transmission voltage in india is ?
A. 750 KV
B. 400 KV
C. 220 KV
D. 132 KV
9. The curve between V and I of SCR when anode is positive w.r.t cathode and when anode is negative w.r.t cathode are known as
A. both as forward characteristics
B. both as reverse characteristics
C. former as forward characteristics and later as reverse characteristics
D. former as reverse characteristics and later as forward characteristics
10. Four point in DC motor is used
A. To increase the field current
B. Not to affect the current through hold on coil even if any change in field current takes place
C. To increase the field current
D. None of these
11. Minimum number of 2-input NAND gates required to implement the function F = (x + y) (Z + W) is ..
A. 3
B. 4
C. 5
D. 6
12. Transformer is used ?
A. to step-up the voltage
B. to step-down the voltage
C. on DC
D. to step-up or step-down the voltage
13. 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
14. The basic elements of an electric drive are :
A. electric motor and the transmission system
B. electric motor ,the transmission and control system
C. the transmission and control system
D. electric motor and conversion equipment
15. In which method, joints are made wherever tapping must be taken from cable
A. Looping back method
B. Looping in method using 2 plate ceiling roses and switches
C. Looping in method using 2 plate ceiling roses and switches
D. Joint box method
16. For equal capacity, a shell type transformer as compared to core type transfer will have :
A. Low copper loss
B. Low iron loss
C. Low copper and iron loss
D. High copper and iron loss
17. For avoiding hard and long shadows,
A. Large number of small luminaries mounted at a height of less than 2.5 m can be used
B. Large number of small luminaries mounted at a height of not less than 2.5 m can be used
C. Small number of small luminaries mounted at a height of less than 2.5 m can be used
D. Small number of large luminaries mounted at a height of not less than 2.5 m can be used
18. Charge on an electron is ?
A. 1.602 * 10-19 C
B. 1.602 * 10-19 ΅C
C. 9.107 * 10-31 C
D. 9.107 * 10-25 C
19. An SCR behaves as a . switch
A. Unidirectional
B. Bidirectional
C. Mechanical
D. None of these
20. An SCR has .. semiconductor layers
A. Two
B. Three
C. Four
D. None of these
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