Transformer MCQ TEST Part-03

#1. The voltage ratio in a transformer is directly proportional to:

A) The number of turns in the primary winding

B) The number of turns in the secondary winding

C) The square of the number of turns

D) The number of turns in the primary and secondary windings

#2. If the number of turns in the secondary coil is greater than the number of turns in the primary coil, the transformer is called:

A) Step-up transformer

B) Step-down transformer

C) Isolation transformer

D) Autotransformer

#3. Dy1 means ………?

A) primary is delta and secondary is star connected, secondary leads primary by 30°

B) primary is delta and secondary is star connected, primary leads secondary by 30°

C) primary is delta and secondary is is star connected, secondary leads primary by 90°

D) primary is delta and secondary is is star connected, primary leads secondary by 90°

#4. which of the following is not an example of transformer connection?

A) Open delta-Y

B) Y-Y

C) Y-∆

D) ∆-∆

#5. practically in open circuit test of a transformer the wattmeter measures

A) Copper loss

B) Core Loss

C) A slight Copper loss

D) Both a & b

#6. In open circuit test of a transformer power supply is given in….

A) Low Voltage side

B) High Voltage side

C) Both a & b

D) None of these

#7. In an ideal transformer, the power on the primary side is equal to:

A) The power on the secondary side

B) Half of the power on the secondary side

C) Twice the power on the secondary side

D) The sum of power on both sides

#8. A transformer’s efficiency is primarily determined by:

A) Input voltage

B) Output voltage

C) Losses in the transformer

D) Frequency

#9. The core of a transformer is typically made of:

A) Copper

B) Silicon steel

C) Aluminum

D) Iron oxide

#10. If a transformer operates at full load, the primary and secondary currents are related as:

A) Ip=Is

B) Ip=Ns/Np

C) Ip=Np/Ns

D) Ip⋅Vp=Is⋅Vs