MCQs on Transformer - MCQ on Single Phase Transformer
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Electrical Engineering Multiple Choice Questions and Answers-MCQs Preparation for Engineering Competitive Exams.
- none of the above
- is safe to human beings
- avoids core saturation and high voltage induction
- protects the primary circuit
Question 1: The secondary of a current transformer is always short-circuited under operating conditions because it?
Answers: avoids core saturation and high voltage induction
- near full-load
- 10% overload
- half-load
- no-load
Question 2: Power transformers are generally designed to have maximum efficiency around?
Answers: near full-load
- ratings
- leakage reactance
- efficiencies
- per unit impedance
Question 3: Two transformers operating in parallel will share the load depending upon their?
Answers: per unit impedance
- no load
- nearly full load
- 70% full load
- 50% full load
Question 4: Power transformers are designed to have maximum efficiency at?
Answers: nearly full load
- delta/delta
- delta/star
- star/star
- star/delta
Question 5: Which of the following 3-phase connections of transformer create disturbances in communication systems?
Answers: star/star
- high hysteresis
- high resistance
- low permeability
- low resistance
Question 6: In high frequency transformer ferrite cores are used because a ferrite core has?
Answers: low resistance
- Potential transformer
- Current transformer
- Step-up transformer
- Step-down transformer
Question 7: The secondary winding of which of the following transformers is always kept closed?
Answers: Current transformer
- delta/star connections
- delta/delta connections
- star/star connections
- star/delta connections
Question 8: Delta-delta power transformer is protected by current transformer having ?
Answers: star/star connections
- insulate the core
- none of the above
- lubricate the core
- insulate the coils
Question 9: ln large transformers, oil is invariably used in order to ?
Answers: insulate the core
- leads the flux inducing it by 90º
- lags the flux inducing it by 180º
- leads the flux inducing it by 180º
- the flux inducing it by 90°
Question 10: A sinusoidal EMF ?
Answers: the flux inducing it by 90°
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Total Questions Attempted: 0
Correct: 0 Wrong: 0
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