Principle of Operation - MCQs with Answers

Principle of Operation - MCQs with Answers

Q1. In a step-up transformer when the voltage delivered is higher than that received, the current delivered is

a. Higher than that received
b. Lower than that received
c. Equal to that received
d. Equal to half of that received

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Q2. What happens if dc supply is given to the transformer?

a. Transformer will work more efficiently
b. It will work less efficiently
c. It will work same as with ac supply
d. Not work at all

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Q3. For a transformer, permeability and hysteresis loss should be

a. Low, low
b. Low, high
c. High, low
d. High, high

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Q4. During starting, the magnetic field produced in a transformer is

a. 1.5 times the maximum
b. Equal to the maximum
c. 0.5 times of the maximum
d. Equal to zero

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Q5. For transformers ratings are always given in kVA, not in kW because

a. It is conventional
b. Power factor of load is not known
c. For higher efficiency
d. To make calculation simple

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