Transformers MCQs (Part-10)

What is the primary purpose of insulation testing in transformers?

A Check insulation integrity
B Test voltage
C Measure resistance
D Detect faults

Which method is used to detect faults in transformers during operation?

A Insulation resistance test
B Open-circuit test
C Voltage regulation test
D Differential protection relay

What is the significance of load testing in transformers?

A Detect short circuits
B Check insulation
C Measure efficiency
D Test voltage levels

What is the main factor that affects the insulation resistance of a transformer?

A Core material
B Temperature
C Voltage
D Frequency

What does the load test of a transformer measure?

A Insulation resistance
B Voltage drop
C Output power
D Current rating

Which type of fault is most commonly detected during transformer fault analysis?

A Voltage sag
B Short circuit
C Ground fault
D Overload

What is the function of a Buchholz relay in transformer protection?

A Detect gas accumulation
B Test insulation
C Measure current
D Detect temperature rise

What does an insulation resistance test primarily check?

A Voltage regulation
B Core material integrity
C Leakage currents
D Load capacity

What is the result of low insulation resistance in a transformer?

A Reduced current flow
B Risk of electrical failure
C Increased efficiency
D Better voltage regulation

During a short-circuit test, what is primarily measured in a transformer?

A Voltage ratio
B Core loss
C Impedance
D Current flow

What is typically observed during a transformer’s open-circuit test?

A No-load current
B Voltage regulation
C Core saturation
D Short-circuit impedance

What is a common cause of transformer failure detected in fault analysis?

A Underloading
B Low voltage
C Frequency instability
D Overheating

What is the purpose of applying a high-voltage test during transformer maintenance?

A Calculate impedance
B Test voltage regulation
C Check insulation
D Measure efficiency

What is the significance of conducting a load test before installing a transformer?

A Test insulation resistance
B Verify capacity
C Check cooling system
D Assess noise level

What is the most likely consequence of not performing regular fault analysis on a transformer?

A Reduced lifespan
B Increased efficiency
C Enhanced insulation
D Better voltage regulation