Find real questions from previous competitive exam papers with answers and solutions.
Leave the keyword blank to browse saved questions for your selected exam, newest papers first. Add a keyword, year or topic to narrow the results.
Browse complete papersThe armature reaction in a synchronous generator primarily serves which purpose?
Improve voltage regulation
Distort the main magnetic field
Increase efficiency
Reduce copper losses
Correct answer
Improve voltage regulation
If the frequency of the incoming generator is higher than that of the bus bar, the synchroscope rotates in which direction?
Clockwise
Anticlockwise
Stays stationary
Vibrates
Correct answer
Clockwise
For achieving linear amplification, a BJT must operate in which region?
Cut-off region
Saturation region
Active region
Reverse active region
Correct answer
Cut-off region
What is the phase difference between the input and output signals in a common-emitter (CE) amplifier?
0°
90°
180°
360°
Correct answer
0°
For sustained oscillations in an oscillator circuit, the loop gain must be:
Less than unity
Greater than unity
Exactly unity with zero phase shift
Zero
Correct answer
Less than unity
The high power gain of a CE amplifier is mainly due to:
High current gain
High voltage gain
Both A and B
Low losses
Correct answer
High current gain
A MOSFET functions as an amplifier when it operates in which region?
Cut-off
Triode
Saturation
Breakdown
Correct answer
Cut-off
Differential protection is primarily used for the protection of which equipment?
Transmission lines
Feeders
Generators and transformers
Motors only
Correct answer
Transmission lines
A circuit breaker rated for a short-circuit current of 25 kA indicates which capability of the breaker?
Normal current
Peak current
Fault interrupting capacity
Load current
Correct answer
Normal current
A transformer protected by a Buchholz relay must be of which type?
Air-cooled
Oil-immersed
Dry-type
Gas-filled
Correct answer
Air-cooled