NEA LokSewa Test/quiz Question set - 3 || Model question set 3

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Model question set 3

Multiple Choice Question
Each question has equal 1 mark.

1. Earth conductivity is affected by:
moisture content in the soil
chemical composition
concentration of salts in the soil
all of the above
2. Emulsifier protection is associated with:
grounding protection
dielectric strength protection of cables and conductors
lightning protection
fire protection
3. For 66 KV lines the total no of insulator discs used are
3
5
8
12
4. Ten discs usually suggest that the transmission line voltage is
11 KV
33 KV
66 KV
132 KV
5. A CT is connected in ___ with the line.
series
across
both a & b
none
6. A PT is connected in ___ with the line.
series
across
both a & b
none
7. The contact resistance is least affected by:
shape of the contact faces
ambient temperature
mechanical forces applied
amount of surface commutation
8. Arc chutes are used in:
OCB
VCB
SF6
ACB
9. Tapping of step down transformers are provided at
high voltage side
low voltage side
both a & b
none
10. The oil used in transformer serves as
coolant
insulator
both a & b
none
11. The slip speed of the induction motor depends upon:
armature current
supply voltage
mechanical load
eddy currents
12. The starting torque of the simple type of squirrel-cage motor is:
low
increases as rotor current rises
decreases as rotor current rises
high
13. The power factor of a 3-phase induction motor at no load is approximately
0.2
0.7
0.85
1
14. The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is
60 Hz
50 Hz
25 Hz
16.67 Hz
15. Which material is for core construction of DC machines?
silicon steel
nickel steel
carbon steel
any

Answer sheet for all questions

1. Earth conductivity is affected by:
all of the above
2. Emulsifier protection is associated with:
fire protection
3. For 66 KV lines the number of insulator discs used are
5
4. Ten discs usually suggest that the transmission line voltage is
132 KV
5. A CT is connected in ___ with the line.
series
6. A PT is connected in ___ with the line.
across
7. The contact resistance is least affected by:
ambient temperature
8. Arc chutes are used in:
ACB
9. Tapping of step down transformers are provided at
high voltage side
10. The oil used in transformer serves as
both a & b
11. The slip speed of an induction motor depends upon:
mechanical load
12. The starting torque of a simple squirrel-cage motor is:
low
13. The power factor of a 3-phase induction motor at no load is approximately
0.2
14. The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is
16.67 Hz
15. Which material is for core construction of DC machines?
silicon steel