Explore topic-wise MCQs in Electronics & Communication Engineering.

This section includes 519 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.

501.

Assertion (A): If f(t) = 1 - e-t, Reason (R):

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. R is correct but A is wrong
Answer» C. A is correct but R is wrong
Discussion
502.

For the control system in the given figure, the value of K for critical damping is

A. 1
B. 5.125
C. 6.831
D. 10
Answer» C. 6.831
Discussion
503.

Lag compensation increases bandwidth of the system.

A. 1
B.
C. Both A and R are correct and R is correct explanation of A
D. Both A and R are correct but R is not correct explanation of A
Answer» C. Both A and R are correct and R is correct explanation of A
Discussion
504.

Assertion (A): If points at infinity are included, G(s) has same number of poles and zeros.Reason (R): The function has a zero at s = - 2.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. R is correct but A is wrong
Answer» C. A is correct but R is wrong
Discussion
505.

First column elements of Routh's tabulation are 3, 5, , 2. It means that there

A. is one root in left half s plane
B. are two roots in left half s plane
C. are two roots in right half s plane
D. is one root in right half s plane
Answer» D. is one root in right half s plane
Discussion
506.

In Bode diagram (log magnitude plot) the factor in the transfer function gives a line having slope

A. -20 dB per octave
B. -10 dB per octave
C. -6 dB per octave
D. -2 dB per octave
Answer» D. -2 dB per octave
Discussion
507.

For the system in the given figure. The transfer function C(s)/R(s) is

A. G1 + G2 + 1
B. G1 G2 + 1
C. G1 G2 + G2 + 1
D. G1 G2 + G1 + 1
Answer» D. G1 G2 + G1 + 1
Discussion
508.

The system in the given figure, has

A. good gain and phase margin
B. poor gain and phase margin
C. good gain margin but poor phase margin
D. poor gain margin but good phase margin
Answer» E.
Discussion
509.

Consider the following systemsSystem I, System II, where C(s) is the output and R(s) is the input of these systems

A. System I has larger bandwidth and faster speed of response than System II
B. System II has larger bandwidth and faster speed of response than System I
C. System I has larger bandwidth but System II has faster speed of response
D. System II has larger bandwidth but System I has faster speed of response
Answer» B. System II has larger bandwidth and faster speed of response than System I
Discussion
510.

The first column of a Routh array isHow many roots of the corresponding characteristic equation are in left half s-plane?

A. 2
B. 3
C. 4
D. 5
Answer» C. 4
Discussion
511.

If error voltage is e(t), integral square error =

A. e2(t) dt
B.
Answer» C.
Discussion
512.

Which of the following is used to obtain output position in a position control system?

A. Strain gauge
B. Load cell
C. Synchro
D. Thermistor
Answer» C. Synchro
Discussion
513.

Examine the following statements Air and gases are compressible.Air, gases and some liquids are compressible.Oil can function as hydraulic fluid as well as lubricator. Which of the above statements are correct?

A. 3 only
B. 2 and 3 only
C. 1 and 3 only
D. 2 only
Answer» D. 2 only
Discussion
514.

Consider the systems with following open loop transfer functions If unity feedback is used, the increasing order of time taken for unit step response to settle is

A. 1, 2, 3
B. 3, 1, 2
C. 2, 3, 1
D. 3, 2, 1
Answer» D. 3, 2, 1
Discussion
515.

If a zero is added to a second order underdamped system

A. the peak overshoot is increased
B. the peak overshoot is decreased
C. the peak overshoot remains unchanged
D. either (a) or (b)
Answer» B. the peak overshoot is decreased
Discussion
516.

Whether a linear system is stable or unstable that it

A. is a property of the system only
B. depends on the input function only
C. both (a) and (b)
D. either (a) or (b)
Answer» B. depends on the input function only
Discussion
517.

For a second order system with 0 < ξ < 1, the angle which poles make with negative real axis is

A. sin-1 ξ
B. cos-1 ξ
C. tan-1 ξ
D. cot-1 ξ
Answer» C. tan-1 Œæ
Discussion
518.

In the given figure the input frequency is such that R

A. v0 lags vi by 90°
B. v0 leads vi by 90°
C. v0 and vi are in phase
D. either (b) or (c)
Answer» B. v0 leads vi by 90¬∞
Discussion
519.

For the system in the given figure the characteristic equation is

A.
B.
Answer» B.
Discussion