Transformer MCQ Question and Answer - Set 08 - ObjectiveBooks

Transformer MCQ Question and Answer - Set 08

Practice Test: Question Set - 08

1. The degree of mechanical vibrations produced by the laminations of a transformer depends on
    (A) Tightness of clamping
    (B) Gauge of laminations
    (C) Size of laminations
    (D) All of the above

2. The primary winding of a power transformer should always be
    (A) Open
    (B) Shorted
    (C) Switched
    (D) Fused

3. Which of the following does not change in a transformer?
    (A) Current
    (B) Voltage
    (C) Frequency
    (D) All of the above

4. The purpose of providing an iron core in a transformer is to
    (A) Provide support to windings
    (B) Reduce hysteresis loss
    (C) Decrease the reluctance of the magnetic path
    (D) Reduce eddy current losses

5. A common method of cooling a power transformer is
    (A) Natural air cooling
    (B) Air blast cooling
    (C) Oil cooling
    (D) Any of the above

6. How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?
    (A) 9 V
    (B) 90 V
    (C) 900 V
    (D) 0.9 V

7. The power transformer is a constant
    (A) Voltage device
    (B) Current device
    (C) Power device
    (D) Main flux device

8. The transformer ratings are usually expressed in terms of
    (A) Volts
    (B) Amperes
    (C) kW
    (D) kVA

9. Which of the following property is not necessarily desirable in the material for transformer core?
    (A) Mechanical strength
    (B) Low hysteresis loss
    (C) High thermal conductivity
    (D) High permeability

10. The path of the magnetic flux in transformer should have
    (A) High reluctance
    (B) Low reactance
    (C) High resistance
    (D) Low resistance

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