Transformers Mcqs Start Creating PDF

MCQ: Which of the following does not change in a transformer ?

1. Current
2. Voltage
3. Frequency
4. All of the above

MCQ: In a transformer the energy is conveyed from primary to secondary_________?

1. through cooling coil
2. through air
3. by the flux
4. none of the above

MCQ: A transformer core is laminated to__________?

1. reduce hysteresis loss
2. reduce eddy current losses
3. reduce copper losses
4. reduce all above losses

MCQ: The degree of mechanical vibrations produced by the laminations of a transformer depends on____________?

1. tightness of clamping
2. gauge of laminations
3. size of laminations
4. all of the above

MCQ: The no-load current drawn by transformer is usually what per cent of the full-load current ?

1. 0.2 to 0.5 per cent
2. 2 to 5 per cent
3. 12 to 15 per cent
4. 20 to 30 per cent

MCQ: The path of a magnetic flux in a transformer should have______________?

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

MCQ: No-load on a transformer is carried out to determine______________?

1. copper loss
2. magnetising current
3. magnetising current and loss
4. efficiency of the transformer

MCQ: The dielectric strength of transformer oil is expected to be______________?

1. lkV
2. 33 kV
3. 100 kV
4. 330 kV

MCQ: Sumpner’s test is conducted on transformers to determine_____________?

1. temperature
2. stray losses
3. all-day efficiency
4. none of the above

MCQ: The permissible flux density in case of cold rolled grain oriented steel is around__________?

1. 1.7 Wb/m2
2. 2.7 Wb/m2
3. 3.7 Wb/m2
4. 4.7 Wb/m2