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 →
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)
The Fourier Transform of a continuous-time Dirac Delta function delta(t) is equal to:
A1
B0
C2 * pi
D1 / s
The maximum theoretical conversion efficiency of a Class B push-pull power amplifier is approximately:
A50.0%
B25.0%
C90.0%
D78.5%
Common Mode Rejection Ratio (CMRR) of an ideal Op-Amp is:
AUnity
BInfinite
CZero
D100
The voltage gain of an inverting operational amplifier circuit with feedback resistor R_f and input resistor R_in is:
A-R_f / R_in
B-R_in / R_f
C1 + (R_f / R_in)
DR_in / R_f
The standard secondary current rating for a Current Transformer (CT) used in power system protection is usually:
A0.1 A or 0.5 A
B1 A or 5 A
C10 A or 20 A
D100 A