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SSC JE ELECTRICAL
ssc MCQs with answers - Part 5
1. Determine the secondary voltage (in V) of a potential transformer when the value of the system voltage is 11,000 V, the turns ratio of the potential transformer is 102 and the percentage voltage error of the transformer is 3 % ?
102.5
104.6
108.8
109.4
Answer: 104.6
Explanation:
104.6
2. In dc machine iron losses cause ?
heating in core
loss in efficiency
rise in temperature of ventilating air
all of the mentioned
Answer: heating in core
Explanation:
heating in core
3. Armature current at starting can be reduced by keeping ?
Rf maximum and Ra minimum
Ra maximum and Rf maximum
Ra minimum and Rf minimum
Ra maximum and Rf minimum
Answer: Ra maximum and Rf minimum
Explanation:
Ra maximum and Rf minimum
4. In dc motors, under leading pole tips flux density will ?
increase
decrease
either increase or decrease
None of these
Answer: decrease
Explanation:
decrease
5. The field winding will be drawn at what degree ?
60 degree
30 degree
90 degree
180 degree
Answer: 90 degree
Explanation:
90 degree
6. Compensating winding is placed in the ?
pole shoe
armature core
main field
all option are correct
Answer: pole shoe
Explanation:
pole shoe
7. stepped cores are used in transformers in order to reduce ?
volume of iron
volume of copper
iron loss
reluctance of core
Answer: volume of copper
Explanation:
volume of copper
8. In a transformer the resistance between its primary and secondary is ?
zero
1 ohm
1000 ohms
infinite
Answer: infinite
Explanation:
infinite
9. In a transformer zero voltage regulation is achieved at a load power factor which is ?
zero
leading
lagging
Unity
Answer: leading
Explanation:
leading
10. In the induction motors the torque is directly proportional to the ?
slip^1/3
higher slip values
Voltage Slip
lower slip values
Answer: higher slip values
Explanation:
higher slip values
