Transformers MCQs - Quiz 2

1. ___ steel is used in core of a transformer.
A) Cold rolled
B) Hot rolled
C) Grain oriented
D) All of above

The correct answer is D

2. Efficiency of a transformer depends on ___
A) Load
B) Power factor
C) Both A & B
D) None of above

The correct answer is C

3. A power transformer is operating at max efficiency if copper losses ___ irons losses
A) Equal to
B) Greater than
C) Smaller than
D) None of above

The correct answer is A

4. ___ are due to reversal of magnetization in the transformer core.
A) Copper losses
B) Eddy current losses
C) Hysteresis losses
D) None of above

The correct answer is C

5. Auto-transformer consists of ___
A) One winding
B) Two windings
C) Three windings
D) No windings

The correct answer is A

6. Three winding transformer consists of ___ winding
A) Primary
B) Secondary
C) Tertiary
D) All of above

The correct answer is D

7. ___ is the measure of voltage drop from no load to full load.
A) Voltage increment
B) Voltage reduction
C) Loss control
D) Voltage regulation

The correct answer is D

8. % Voltage regulation = ___ x 100
A) (V_no-load-V_full-load)/2V_full-load
B) (V_no-load+V_full-load)/V_full-load
C) 2(V_no-load-V_full-load)/V_full-load
D) (V_no-load-V_full-load)/V_full-load

The correct answer is D

9. The value of voltage regulation at capacitive load is ___
A) Zero
B) Infinity
C) Positve
D) Negative

The correct answer is D

10. Function of oil in transformer tank is ___
A) Cooling
B) Insulation
C) Both A & B
D) None of Above

The correct answer is C