Transformers MCQ Quiz - Multiple Choice Questions & Answers

1. When AC supply is given to the transformer, the flux will depend on

1. current
2. voltage
3. frequency
4. both voltage and frequency

2. In transformer, humming sound occurs due to

1. oil
2. load
3. magnetostriction
4. none of above

3. As compared the transformer with AC machines it is more efficient because

1. it does not have mechanical losses
2. it does not have copper losses
3. core losses negligible
4. none of above

4. The primary and secondary winding of transformer are linked each other by

1. conduction
2. mutual induction
3. not linked at all
4. self induction

5. Which parameter does not change during transformation action in transformer?

1. Voltage
2. Frequency
3. Current
4. None of these

6. Secondary current of a step down transformer is

1. lower than primary current
2. higher than primary current
3. equal to primary current
4. double than primary current

7. The core of transformer must have

1. low reluctance
2. high resistance
3. high reluctance
4. low resistance

8. The working principle of transformer depends upon

1. Ohms Law
2. Lenz Law
3. Flemings left hand rule
4. Faradays law of electromagnetic induction

9. An ideal transformer is one which has

1. no winding resistance
2. no leakage reactance
3. no losses
4. all of above

10. In an ideal transformer the magnetizing current lags behind applied primary voltage by an angle

1. 90 degree
2. 75 degree
3. -90 degree
4. 45 degree