Electrical Online Test 27

Attempt Free Electrical Online Test 27 Here. Read The Important Electrical MCQ From Below.

1) Transfer function of a system is used to calculate which of the following ?

a. The order of the system
b. The time constant
c. The output for any given input
d. The steady state gain
Ans. c. The output for any given input

2) The transient response, with feedback system,

a. Rises slowly
b. Rises quickly
c. Decays slowly
d. Decays quickly
Ans. d. Decays quickly

3) The position and velocity errors of a type-2 system are

a. Constant, constant
b. Constant, infinity
c. Zero, constant
d. Zero, zero
Ans. c. Zero, constant

4) technique is not applicable to nonlinear system ?

a. Nyquist Criterion
b. Quasi linearization
c. Functional analysis
d. Phase-plane representation
Ans. a. Nyquist Criterion

5) Addition of zeros in transfer function causes which of the following ?

a. Lead-compensation
b. Lag-compensation
c. Lead-lag compensation
d. None of the these
Ans. b. Lag-compensation

Electrical Online Test 27

6) A controller, essentially, is a

a. Sensor
b. Clipper
c. Comparator
d. Amplifier
Ans. c. Comparator

7) Which of the following is the best method for determining the stability and transient response ?

a. Root locus
b. Bode plot
c. Nyquist plot
d. None of these
Ans. a. Root locus

8) From which of the following transfer function can be obtained ?

a. Signal flow graph
b. Analogous table
c. Output-input ratio
d. Standard block system
Ans. a. Signal flow graph

9) The capacitance, in force-current analogy, is analogous to

a. Momentum
b. Velocity
c. Displacement
d. Mass
Ans. d. Mass

10) An increase in gain, in most systems, leads to

a. Smaller damping ratio
b. Larger damping ratio
c. Constant damping ratio
d. All of these
Ans. a. Smaller damping ratio

Electrical Online Test 27

11) The frequency and time domain are related through which of the following?

a. Laplace Transform and Fourier Integral
b. Laplace Transform
c. Fourier Integral
d. Either of Laplace or Fourier
Ans. a. Laplace Transform and Fourier Integral

12) With feedback _____ increases

a. System stability
b. Sensitivity
c. Gain
d. Effects of disturbing signals
Ans. a. System stability

13) The transfer function is applicable to which of the following ?

a. Linear and time-in variant systems
b. Linear and time-variant systems
c. Linear systems
d. Non-linear systems
Ans. a. Linear and time-in variant systems

14) If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is

a. Not necessarily stable
b. Stable
c. Unstable
d. Always unstable
Ans. a. Not necessarily stable

Electrical Online Test 27

15) By which of the following the system response can be tested better ?

a. Ramp input signal
b. Sinusoidal input signal
c. Unit impulse input signal
d. Exponentially decaying signal
Ans. c. Unit impulse input signal

16) In a control system the output of the controller is given to

a. Final control element
b. Amplifier
c. Comparator
d. Sensor
Ans. a. Final control element

17) Velocity error constant of a system is measured when the input to the system is unit _______ function.

a. Parabolic
b. Ramp
c. Impulse
d. Step
Ans. b. Ramp

18) Phase margin of a system is used to specify which of the following ?

a. Frequency response
b. Absolute stability
c. Relative stability
d. Time response
Ans. c. Relative stability

19) In an automatic control system which of the following elements is not used ?

a. Error detector
b. Final control element
c. Sensor
d. Oscillator
Ans. d. Oscillator

Electrical Online Test 27

20) In order to increase the damping of a badly underdamped system which of following compensators may be used ?

a. Phase-lead
b. Phase-lag
c. Both phage lead and phage lag
d. Either phage lead or phage lag
Ans. a. Phase-lead

21) A conditionally stable system exhibits poor stability at

a. Low frequencies
b. Reduced values of open loop gain
c. Increased values of open loop gain
d. None of the these
Ans. b. Reduced values of open loop gain

22) The type 2 system has at the origin.

a. No net pole
b. Net pole
c. Simple pole
d. Two poles
Ans. d. Two poles

23) Spring constant in force-voltage analogy is analogous to

a. Capacitance
b. Reciprocal of capacitance
c. Current
d. Resistance
Ans. b. Reciprocal of capacitance

Electrical Online Test 27

24) In case of type-1 system steady state acceleration is

a. Unity
b. Infinity
c. Zero
d. 10
Ans. b. Infinity

25) Static error co-efficients are used as a measure of the effectiveness of closed loop systems for specified ________ input signal.

a. Acceleration
b. Velocity
c. Position
d. All of these
Ans. d. All of these

Electrical Online Test 27