MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 166 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
If the gain of the critical damped system is increased it will behave as |
| A. | oscillatory |
| B. | critically damped |
| C. | overdamped |
| D. | underdamped |
| Answer» E. | |
| 52. |
Amplifier: |
| A. | armature controlled fhp dc motor |
| B. | a pair of synchronous transmitter and control transformer |
| C. | tach generator |
| D. | amplidyne |
| Answer» E. | |
| 53. |
Servomotor: |
| A. | armature controlled fhp dc motor |
| B. | a pair of synchronous transmitter and control transformer |
| C. | tach generator |
| D. | amplidyne |
| Answer» C. tach generator | |
| 54. |
For two-phase AC servomotor, if the rotor’s resistance and reactance are respectively R and X, its length and diameter are respectively L and D then, |
| A. | x/r and l/d are both small |
| B. | x/r is large but l/d is small |
| C. | x/r is small but l/d is large |
| D. | x/r and l/d are both large |
| Answer» D. x/r and l/d are both large | |
| 55. |
When human being tries to approach an object, his brain acts as, |
| A. | an error measuring device |
| B. | a controller |
| C. | an actuator |
| D. | an amplifier |
| Answer» C. an actuator | |
| 56. |
Error detector: |
| A. | armature controlled fhp dc motor |
| B. | a pair of synchronous transmitter and control transformer |
| C. | tach generator |
| D. | amplidyne |
| Answer» B. a pair of synchronous transmitter and control transformer | |
| 57. |
State space analysis is applicable for non- linear systems and for multiple input and output systems. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 58. |
System transformation on function H(z) for a discrete time LTI system expressed in state variable form with zero initial condition |
| A. | -1b+d |
| B. | c(zi-a)-1 |
| C. | (zi-a)-1z |
| D. | (zi-a)-1 |
| Answer» B. c(zi-a)-1 | |
| 59. |
When the number of poles is equal to the number of zeroes, how many branches of root locus tends towards infinity? |
| A. | 1 |
| B. | 2 |
| C. | equal to number of zeroes |
| Answer» D. | |
| 60. |
The addition of open loop zero pulls the root loci towards: |
| A. | the left and therefore system becomes more stable |
| B. | the right and therefore system becomes unstable |
| C. | imaginary axis and therefore system becomes marginally stable |
| D. | the left and therefore system becomes unstable |
| Answer» B. the right and therefore system becomes unstable | |
| 61. |
If root loci plots of a particular control system do not intersect the imaginary axis at any point, then the gain margin of the system will be: |
| A. | 0 |
| B. | 0.707 |
| C. | 1 |
| D. | infinite |
| Answer» E. | |
| 62. |
If the gain of the system is reduced to a zero value, the roots of the system in the s- plane, |
| A. | coincide with zero |
| B. | move away from zero |
| C. | move away from poles |
| D. | coincide with the poles |
| Answer» E. | |
| 63. |
Which one of the following are correct? The root locus is the path of the roots of the characteristic equation traced out in the s- plane? |
| A. | as the input of the system is changed |
| B. | as the output of the system is changed |
| C. | as a system parameter is changed |
| D. | as the sensitivity is changed |
| Answer» D. as the sensitivity is changed | |
| 64. |
What is the number of the root locus segments which do not terminate on zeroes? |
| A. | the number of poles |
| B. | the number of zeroes |
| C. | the difference between the number of poles and zeroes |
| D. | the sum of the number of poles and the number of the zeroes |
| Answer» D. the sum of the number of poles and the number of the zeroes | |
| 65. |
The breakaway point calculated mathematically must always lie on the root locus. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 66. |
Which one of the following is not the property of root loci? |
| A. | the root locus is symmetrical about imaginary axis |
| B. | they start from the open loop poles and terminate at the open loop zeroes |
| C. | the breakaway points are determined from dk/ds = 0 |
| D. | segments of the real axis are the part of the root locus if and only is the total number of real poles and zeroes to their right is odd. |
| Answer» B. they start from the open loop poles and terminate at the open loop zeroes | |
| 67. |
Consider the loop transfer function K(s+6)/(s+3)(s+5) In the root locus diagram the centroid will be located at: |
| A. | -4 |
| B. | -1 |
| C. | -2 |
| D. | -3 |
| Answer» D. -3 | |
| 68. |
Which one of the following applications software’s is used to obtain an accurate root locus for? |
| A. | lisp |
| B. | matlab |
| C. | dbase |
| D. | oracle |
| Answer» C. dbase | |
| 69. |
Number of roots of characteristic equation is equal to the number of |
| A. | branches |
| B. | root |
| C. | stem |
| D. | poles |
| Answer» B. root | |
| 70. |
Consider the following statements regarding root loci: |
| A. | all root loci start from the respective poles of g(s) h(s) |
| B. | all root loci end at the respective zeros of g(s) h(s) or go to infinity |
| C. | the root loci are symmetrical about the imaginary axis of the s-plane |
| D. | all root loci start and end from the respective poles of g(s) h(s) or go to infinity |
| Answer» C. the root loci are symmetrical about the imaginary axis of the s-plane | |
| 71. |
Routh Hurwitz criterion is better than root locus. |
| A. | true |
| B. | false |
| Answer» C. | |
| 72. |
Root locus is used to calculate: |
| A. | marginal stability |
| B. | absolute stability |
| C. | conditional stability |
| D. | relative stability |
| Answer» E. | |
| 73. |
The addition of open loop poles pulls the root locus towards: |
| A. | the right and system becomes unstable |
| B. | imaginary axis and system becomes marginally stable |
| C. | the left and system becomes unstable |
| D. | the right and system becomes unstable |
| Answer» E. | |
| 74. |
While increasing the value of gain K, the system becomes |
| A. | less stable |
| B. | more stable |
| C. | unstable |
| D. | absolute stable |
| Answer» B. more stable | |
| 75. |
The main objective of drawing root locus plot is : |
| A. | to obtain a clear picture about the open loop poles and zeroes of the system |
| B. | to obtain a clear picture about the transient response of feedback system for various values of open loop gain k |
| C. | to determine sufficient condition for the value of ‘k’ that will make the feedback system unstable |
| D. | both b and c |
| Answer» E. | |
| 76. |
Root locus of s(s+2)+K(s+4) =0 is a circle. What are the coordinates of the center of this circle? |
| A. | -2,0 |
| B. | -3,0 |
| C. | -4,0 |
| D. | -5,0 |
| Answer» D. -5,0 | |
| 77. |
                       is a quantitative measure of how fast the transients die out in the system. |
| A. | absolutely stable |
| B. | conditionally stable |
| C. | unstable |
| D. | relative stability |
| Answer» E. | |
| 78. |
A linear system can be classified as : |
| A. | absolutely stable |
| B. | conditionally stable |
| C. | unstable |
| D. | all of the mentioned |
| Answer» E. | |
| 79. |
Roots on the imaginary axis makes the system : |
| A. | stable |
| B. | unstable |
| C. | marginally stable |
| D. | linear |
| Answer» D. linear | |
| 80. |
Roots with higher multiplicity on the imaginary axis makes the system : |
| A. | absolutely stable |
| B. | unstable |
| C. | linear |
| D. | stable |
| Answer» C. linear | |
| 81. |
If the roots of the have negative real parts then the response is |
| A. | stable |
| B. | unstable |
| C. | marginally stable |
| D. | bounded |
| Answer» E. | |
| 82. |
The roots of the transfer function do not have any effect on the stability of the system. |
| A. | true |
| B. | false |
| Answer» C. | |
| 83. |
For non-linear systems stability cannot be determined due to: |
| A. | possible existence of multiple equilibrium states |
| B. | no correspondence between bounded input and bounded output stability and asymptotic stability |
| C. | output may be bounded for the particular bounded input but may not be bounded for the bounded inputs |
| D. | all of the mentioned |
| Answer» E. | |
| 84. |
Bounded input and Bounded output stability notion concerns with : |
| A. | a system under influence of input |
| B. | a system not under influence of input |
| C. | a system under influence of output |
| D. | a system not under influence of output |
| Answer» B. a system not under influence of input | |
| 85. |
Lag compensator reduces |
| A. | position constant |
| B. | velocity constant |
| C. | position variable |
| D. | acceleration constant |
| Answer» C. position variable | |
| 86. |
Lead compensator increases bandwidth |
| A. | true |
| B. | false |
| Answer» B. false | |
| 87. |
Proportional controller |
| A. | decreases steady state error and improves stability |
| B. | rise time decreases |
| C. | transient response becomes poorer |
| D. | increases steady state error |
| Answer» E. | |
| 88. |
PI controller: |
| A. | decreases steady state error and improves stability |
| B. | rise time decreases |
| C. | transient response becomes poorer |
| D. | increases steady state error |
| Answer» D. increases steady state error | |
| 89. |
PID controller: |
| A. | decreases steady state error and improves stability |
| B. | rise time decreases |
| C. | transient response becomes poorer |
| D. | increases steady state error |
| Answer» B. rise time decreases | |
| 90. |
Which of the following is an effect of lag compensation? |
| A. | decrease bandwidth |
| B. | improves transient response |
| C. | increases the effect of noise |
| D. | increases stability margin |
| Answer» B. improves transient response | |
| 91. |
PD controller: |
| A. | decreases steady state error and improves stability |
| B. | rise time decreases |
| C. | transient response becomes poorer |
| D. | increases steady state error |
| Answer» C. transient response becomes poorer | |
| 92. |
An all-pass network imparts only |
| A. | negative phase to the input |
| B. | positive phase to the input |
| C. | 90 degree phase shift to the input |
| D. | 180 degree phase shift to the input |
| Answer» E. | |
| 93. |
The roots of the characteristic equation of the second order system in which real and imaginary part represents the : |
| A. | damped frequency and damping |
| B. | damping and damped frequency |
| C. | natural frequency and damping ratio |
| D. | damping ratio and natural frequency |
| Answer» C. natural frequency and damping ratio | |
| 94. |
Nichol’s chart is useful for the detailed study and analysis of: |
| A. | closed loop frequency response |
| B. | open loop frequency response |
| C. | close loop and open loop frequency responses |
| D. | open loop and close loop frequency responses |
| Answer» B. open loop frequency response | |
| 95. |
The critical value of gain for a system is 40 and gain margin is 6dB. The system is operating at a gain of: |
| A. | 20 |
| B. | 40 |
| C. | 80 d) 120 |
| Answer» B. 40 | |
| 96. |
OLTF contains one zero in right half of s- plane then |
| A. | open loop system is unstable |
| B. | close loop system is unstable |
| C. | close loop system is unstable for higher gain |
| D. | close loop system is stable |
| Answer» D. close loop system is stable | |
| 97. |
Which one of the following statements is correct? Nichol’s chart is useful for the detailed study analysis of: |
| A. | closed loop frequency response |
| B. | open loop frequency response |
| C. | close loop and open loop frequency responses |
| D. | none of the above |
| Answer» B. open loop frequency response | |
| 98. |
Frequency range of bode magnitude and phases are decided by : |
| A. | the lowest and higher important frequencies of dominant factors of the oltf |
| B. | the lowest and highest important frequencies of all the factors of the open loop transfer function |
| C. | resonant frequencies of the second factors |
| D. | none of the above |
| Answer» E. | |
| 99. |
4 DESIGN OF COMPENSATORS USING BODE PLOT |
| A. | -1 and origin |
| B. | origin and +1 c) -0.5 and 0.5 |
| C. | d) -1 and +1 |
| Answer» B. origin and +1 c) -0.5 and 0.5 | |
| 100. |
What is the value of M for the constant M circle represented by the equation 8x2+18x+8y2+9=0? |
| A. | 0.5 |
| B. | 2 |
| C. | 3 |
| D. | 8 |
| Answer» D. 8 | |