Govt Exams Mock Test FREE | Online Quiz Competition

Q1. In d.c. generator, if P is number of poles, N the rpm of rotor, then the frequency of magnetic reversals is

NP/2

NP/60

NP/120

NP/3600

Q2. Which of the following machine is best suited for constant speed application.

DC series motor

3-φ induction motor

Synchronous motor

1-φ induction motor

Q3. What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:

Eddy Current and Hysteresis losses will be excessive

Current will be too much high

Transformer may start to smoke and burn

No effect

Q4. The ideal commutation is not possible because each coil has

resistance

inductance

capacitance

None of the above

Q5. part of DC machine sharing overall more percentage of eddy current loss.

commutator

armature

field poles

yoke

Q6. Which of the following tests can be conducted on other than shunt machines?

swinburne test

field test

retardation test

back to back test

Q7. If P is the number of poles of a generator and N is the armature speed in rpm then frequency f of magnetic reversal is

\(f=\frac{NP}{120}\)

\(f=\frac{PN}{60}\)

\(f=\frac{NP}{240}\)

\(f=\frac{PN}{30}\)

Q8. For parallel operation of two alternators, they must have same________.

KVA rating

Voltage rating

Speed

All of the above

Q9. Damping winding is used in a synchronous motor for

power factor improvement

efficiency improvement

eliminating hunting of the rotor

minimising temperature rise

Q10. The minimum value of insulation resistance permissible for an induction motor is

0.5 MΩ/kV

\(1.0 M\Omega/kV\)

\(2.5 M\Omega/kV\)

\(5.0 M\Omega/kV\)

Quiz

Year 2024

August
Week # 2 Quiz 3

Q1. In d.c. generator, if P is number of poles, N the rpm of rotor, then the frequency of magnetic reversals is

Q2. Which of the following machine is best suited for constant speed application.

Q3. What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:

Q4. The ideal commutation is not possible because each coil has

Q5. part of DC machine sharing overall more percentage of eddy current loss.

Q6. Which of the following tests can be conducted on other than shunt machines?

Q7. If P is the number of poles of a generator and N is the armature speed in rpm then frequency f of magnetic reversal is

Q8. For parallel operation of two alternators, they must have same________.

Q9. Damping winding is used in a synchronous motor for

Q10. The minimum value of insulation resistance permissible for an induction motor is

Quiz

Year 2024

August Week # 4 Expire on 21 Sep 2024

September Week # 1 Expire on 30 Sep 2024

September Week # 2 Expire on 07 Oct 2024

September Week # 3 Expire on 14 Oct 2024

August Week # 2 Quiz 3

Q1. In d.c. generator, if P is number of poles, N the rpm of rotor, then the frequency of magnetic reversals is

Q2. Which of the following machine is best suited for constant speed application.

Q3. What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:

Q4. The ideal commutation is not possible because each coil has

Q5. part of DC machine sharing overall more percentage of eddy current loss.

Q6. Which of the following tests can be conducted on other than shunt machines?

Q7. If P is the number of poles of a generator and N is the armature speed in rpm then frequency f of magnetic reversal is

Q8. For parallel operation of two alternators, they must have same________.

Q9. Damping winding is used in a synchronous motor for

Q10. The minimum value of insulation resistance permissible for an induction motor is

Record & Track Your Performance

August
Week # 2 Quiz 3