Engineering
Engineering MCQs With Answers
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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
The surge impedance of a typical overhead transmission line is in the range of:
A1 to 10 ohms
B4000 to 5000 ohms
C40 to 50 ohms
D400 to 500 ohms