Engineering
Engineering MCQs With Answers
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When measuring power in a 3-phase 3-wire system using the two-wattmeter method, both wattmeters read equal positive values when load power factor is:
AUnity (1.0)
BZero
C0.866 leading
D0.5 lagging
The active power consumed by a pure inductor connected across an AC voltage source is:
AV * I Watts
BZero Watts
CI^2 * X_L Watts
DV^2 / X_L Watts
The RMS value of a pure sinusoidal voltage wave with peak value V_m is:
AV_m / 2
BV_m / pi
CV_m / sqrt(2)
D2 * V_m / pi
For a closed-loop control system to be stable, both Gain Margin (GM) and Phase Margin (PM) expressed in dB and degrees must be:
AEqual to infinity
BZero
CNegative
DPositive
In Norton’s equivalent circuit, the equivalent current source I_N is determined by finding the:
AShort-circuit current between output terminals
BCurrent flowing when supply voltage is zero
COpen-circuit voltage between output terminals
DMaximum load current under unity power factor
In Routh-Hurwitz stability criterion, the number of roots of the characteristic equation lying in the right half of the s-plane equals:
ANumber of sign changes in the first column of Routh array
BNumber of zero elements in second column
CNumber of rows in Routh array
DTotal degree of characteristic polynomial plus one
In a Bode magnitude plot, a single pole located at the origin contributes a constant slope of:
A+20 dB/decade
B-6 dB/decade
C-20 dB/decade
D-40 dB/decade
The Laplace transform of a unit step function u(t) is given by:
As
B1 / s
C1
D1 / s^2
Transfer function of a system is defined as the ratio of Laplace transform of output to Laplace transform of input under which condition?
AAll initial conditions set to zero
BInput voltage set to zero
CSystem operates at resonance
DFrequency is equal to zero
According to Shannon-Hartley theorem, the channel capacity C in bits per second is expressed as:
AC = 2 * B * log2(SNR)
BC = B / log2(1 + SNR)
CC = B * log2(1 + SNR)
DC = B * log10(1 + SNR)