Transformers Archives - MCQ and Quiz for Exams

1. Delta/star transformer works satisfactorily when

load is balanced only

load is unbalanced only

on balanced as well as unbalanced loads

none of the above

Detailed SolutionDelta/star transformer works satisfactorily when

2. In case of a double cage induction motor, the inner cage has

high inductance arid low resistance

low inductance and high resistance

low inductance and low resistance

high inductance and high resistance

Detailed SolutionIn case of a double cage induction motor, the inner cage has

3. Which of the following does not change in a transformer?

Current

Voltage

Frequency

All of the above

Detailed SolutionWhich of the following does not change in a transformer?

4. Which of the following does not change in an ordinary transformer?

Frequency

Voltage

Current

Any of the above

Detailed SolutionWhich of the following does not change in an ordinary transformer?

5. A no-load test is performed on a transformer to determine

core loss

copper loss

efficiency

magnetising current E. magnetising current and loss

Detailed SolutionA no-load test is performed on a transformer to determine

6. The secondary winding of which of the following transformers is always kept closed?

Step-up transformer

Step-down transformer

Potential transformer

Current transformer

Detailed SolutionThe secondary winding of which of the following transformers is always kept closed?

7. A transformer transforms

voltage

current

power

frequency

Detailed SolutionA transformer transforms

8. The transformer ratings are usually expressed in terms of

volts

amperes

kW

kVA

Detailed SolutionThe transformer ratings are usually expressed in terms of

9. The starting torque of a squirrel-cage induction motor is

low

negligible

same as full-load torque

slightly more than full-load torque

Detailed SolutionThe starting torque of a squirrel-cage induction motor is

10. The path of the magnetic flux in transformer should have

high reluctance

low reactance

high resistance

low resistance

Detailed SolutionThe path of the magnetic flux in transformer should have

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