Explore topic-wise MCQs in Electrical Engineering.

This section includes 57 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.

51.

What will happen if the transformers working in parallel are not connected with regard to polarity ?

A. The power factor of the two trans-formers will be different from the power factor of common load
B. Incorrect polarity will result in dead short circuit
C. The transformers will not share load in proportion to their kVA ratings
D. none of the above
Answer» C. The transformers will not share load in proportion to their kVA ratings
Discussion
52.

Where D.C. motor of H.P. 12 or more requires frequent starting, stopping,reversing and speed control

A. drum type controller is used
B. three point starter is used
C. four point starter is used
D. all above can be used
Answer» B. three point starter is used
Discussion
53.

The mechanical power developed by a shunt motor will be maximum when theratio of back e.m.f. to applied voltage is

A. 4.0
B. 2.0
C. 1.0
D. 0.5
Answer» E.
Discussion
54.

If R2 is the resistance of secondary winding of the transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be

A. R2/VK
B. R2IK2
C. R22!K2
D. R22/K
Answer» C. R22!K2
Discussion
55.

While conducting short-circuit test on a transformer the following side is short circuited

A. High voltage side
B. Low voltage side
C. Primary side
D. Secondary side
Answer» C. Primary side
Discussion
56.

In a given transformer for given applied voltage, losses which remainconstant irrespective of load changes are

A. friction and windage losses
B. copper losses
C. hysteresis and eddy current losses
D. none of the above
Answer» D. none of the above
Discussion
57.

The no load current in a transformer lags behind the appliedvoltage by an angle of about

A. 180
B. 120"
C. 90
D. 75
Answer» E.
Discussion