Electrical Engineering
Electrical Engineering MCQs with Answers
Electrical engineering MCQs with answers and detailed explanations for PEC, NTS, WAPDA and engineering job tests. Machines, circuits and power systems. Take a scored quiz instead →
Race-around condition occurs in a JK flip-flop when:
AJ = 1, K = 1 and clock pulse width is greater than propagation delay
BJ = 0, K = 0 with high clock
CJ = 1, K = 0 with low clock
DClock pulse width is zero
De Morgan’s First Law states that (A + B)’ is equivalent to:
AA' + B'
B(A * B)'
CA * B
DA' * B'
Barkhausen criterion for sustained oscillations requires loop gain |A*beta| to be equal to 1 and phase shift to be:
A90 degrees
B0 degrees (or multiples of 360 degrees)
C45 degrees
D180 degrees
A Class-B push-pull power amplifier has a theoretical maximum power efficiency of:
A90%
B25%
C50%
D78.5%
In an insulated-gate bipolar transistor (IGBT), the control gate terminal is insulated from channel similar to a:
ASCR
BMOSFET
CBJT
DDIAC
A Buck-Boost DC-DC converter produces an output voltage that is:
AAlways less than input voltage with same polarity
BAC sinusoidal waveform
CInverted in polarity relative to input voltage
DAlways greater than input voltage with same polarity
The ideal voltage gain of an operational amplifier (Op-Amp) is:
A1000
BInfinite
CZero
D1
Merz-Price circulating current scheme is a differential protection system used primarily for:
AGenerators and Transformers
BDistribution radial feeders
CLong transmission lines only
DLow voltage circuit breakers
A TRIAC is equivalent to two Silicon Controlled Rectifiers (SCRs) connected in:
AAnti-parallel (inverse-parallel) with a common gate
BSeries back-to-back
CBridge configuration
DParallel with same polarity