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SSC JE ELECTRICAL
ssc MCQs with answers - Part 10
1. In induction motor If we remove one phase for instance, two terminals will have 'Y' phase and one will have 'B' phase called ?
AC dynamic Braking
plugging
cascade breaking
increasing motor torque
Answer: AC dynamic Braking
Explanation:
AC dynamic Braking
2. In a capacitor start single-phase induction motor, the capacitor is connected ?
in series with main winding
in series with auxiliary winding
in series with both the windings
in parallel with auxiliary winding
Answer: in series with auxiliary winding
Explanation:
in series with auxiliary winding
3. If running winding of a single-phase induction motor is short circuited ?
run slower
spark at light loads
draw excessive current and overheat
None of these
Answer: None of these
Explanation:
None of these
4. Short-circuiter is used in ?
repulsion induction motor
repulsion motor
repulsion start induction run motor
None of these
Answer: repulsion start induction run motor
Explanation:
repulsion start induction run motor
5. Which of the following statements regarding repulsion-start induction motor is incorrect ?
It requires more maintenance of commutator and other mechanical devices
It makes quite a bit of noise on starting
In fractional horse power motors, it has replaced the capacitor motors
It is not easily reversed
Answer: In fractional horse power motors, it has replaced the capacitor motors
Explanation:
In fractional horse power motors, it has replaced the capacitor motors
6. In a two value capacitor motor, the capacitor used for running purposes is ?
air capacitor
paper spaced oil filled type
ceramic type
a.c. electrolytic type
Answer: paper spaced oil filled type
Explanation:
paper spaced oil filled type
7. Speed control of a universal motor is achieved by ?
varying field flux with tapped field windings
connecting rheostat in series
applying variable voltage
all of these methods
Answer: all of these methods
Explanation:
all of these methods
8. In any case, where the height of transmission tower is increased ?
the line capacitance and inductance will not change
the line capacitance and inductance will decrease
the line capacitance will decrease and line inductance will increase
the line capacitance will decrease but line inductance remain unchanged
Answer: the line capacitance will decrease but line inductance remain unchanged
Explanation:
the line capacitance will decrease but line inductance remain unchanged
9. For transmission lines, steel poles are generally used because: A. It has more mechanical strength and more life B. It occupies less space and give better appearance C. It has high cost ?
Only A
Only B
Both A and B
Only C
Answer: Both A and B
Explanation:
Both A and B
10. A synchronous generator generates reactive power while working at ?
zero power factor
lagging power factor
leading power factor
Any of these
Answer: leading power factor
Explanation:
A synchronous generator generates reactive power while working at leading power factor
