BSNL TTA ONLINE TEST - 3 Control System

BSNL ACADEMY
Quiz by BSNL ACADEMY, updated more than 1 year ago
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Subject : Control System Instruction: Time limit for the exam: 25 Minutes Total number of questions : 30 Q Each question carry 1 mark, no negative marks. DO NOT refresh the page. All the best by BSNL ACADEMY If U Like Our Test series than Share with your friends and Rate Our Tests.
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Question 1

Question
The transfer function for tachometer E(S)/θ(S) is
Answer
  • K
  • KS
  • K/S
  • KS²

Question 2

Question
Which of the following id the electrical analogous element for displacement in force-voltage analogy?
Answer
  • flux
  • voltage
  • charge
  • current

Question 3

Question
Which of the following is/are the characteristics of negative feedback control system?
Answer
  • Low sensitivity to parameter variations
  • Reduction in gain at the expense of better stability
  • Rejection of disturbance signals
  • all of the above

Question 4

Question
Which of the following combinations is/are correct electrical analogous elements in force-current analogy?
Answer
  • Velocity (v) ----------------- Voltage (V)
  • Force (f) --------------------- Current (i)
  • Spring element (K) --------- Inverse inductance (1/L)
  • all of the above

Question 5

Question
Lowest critical frequency is due to pole and it may be present origin or nearer to origin, then it is which type of network?
Answer
  • LC
  • RL
  • RC
  • RLC

Question 6

Question
Lowest critical frequency is due to zero and it may be present origin or nearer to origin, then it is which type of network ?
Answer
  • LC
  • RC
  • RLC
  • RL

Question 7

Question
Poles and zeros are arranged alternatively on negative real axis, then type of network is/are
Answer
  • LC network
  • RC network
  • RL network
  • RL & RC

Question 8

Question
Advantages of open loop system is/are?
Answer
  • simple and economical
  • accurate
  • reliable
  • all of the above

Question 9

Question
Which of the following are the disadvantages of a closed loop control system?
Answer
  • reduces the overall gain
  • complex and costly
  • oscillatory response
  • all of the above

Question 10

Question
Force balancing equation of a dash-pot elements is ( where x = displacement)
Answer
  • B d²x/dt²
  • B dx/dt
  • B *x
  • none of the above

Question 11

Question
What is the order of closed loop system for the plant transfer function G(s) = k/s²(1+Ts) and with unity feedback
Answer
  • 3
  • 2
  • 1
  • 0

Question 12

Question
A second order control system is defined by the following equation: 4 d²c(t)/dt² + 8 dc(t)/dt + 16 c(t) = 16 u(t) The damping ratio and natural frequency for this system are respectively
Answer
  • 0.25 and 2 rad/s
  • 0.25 and 4 rad/s
  • 0.50 and 2 rad/s
  • 0.50 and 4 rad/s

Question 13

Question
The steady state error due to ramp input for a type two system is equal to
Answer
  • zero
  • infinite
  • non zero number
  • constant

Question 14

Question
Differentiation of parabolic response is a -------------- response?
Answer
  • parabolic
  • ramp
  • step
  • impulse

Question 15

Question
Weighting function is in terms of -----------------
Answer
  • Laplace transforms of step response
  • Laplace transforms of ramp response
  • Laplace transforms of parabolic response
  • Laplace transforms of impulse response

Question 16

Question
The impulse response of a system is c(t) = -te-t + 2 e-t (t>0). Its closed loop transfer function is
Answer
  • (2s+1)/s²
  • (2s+1)/(s+1)²
  • (2s+2)/(s+1)²
  • (2s+2)/s²

Question 17

Question
Lead compensator is used to improve ------------------
Answer
  • transient response
  • steady state response
  • both 1 and 2
  • none of the above

Question 18

Question
Adding a pole to a system transfer function in terms of compensator represents a --------------- compensator ?
Answer
  • Lead
  • Lag
  • Lead-Lag
  • Lag-lead

Question 19

Question
A linear time invariant system, initially at rest when subjected to a unit step input gave response c(t) = te-t (t ≥ 0). The transfer function of the system is
Answer
  • 1/s(s+1)²
  • (s+1)²/s
  • s/(s+1)
  • s/(s+1)²

Question 20

Question
Given the transfer function G(s) = 121/(s² + 13.2s + 121) of a system. Which of the following characteristics does it have?
Answer
  • Over damped
  • Critical damped
  • Under damped
  • any of the above

Question 21

Question
For type 1 system with parabolic input, the steady state error is
Answer
  • zero
  • finite constant
  • infinite
  • indeterminate

Question 22

Question
Time taken for the response to raise from zero to 100 % for very first time is called
Answer
  • rise time.
  • settling time.
  • delay time.
  • peak time.

Question 23

Question
Lead network is used to improve
Answer
  • improve transient response.
  • increase bandwidth.
  • improve steady state response.
  • both A and B.

Question 24

Question
Type and order of transfer function G ( s ) = K / {s( s + 2 )}
Answer
  • 1, 2.
  • 2, 1.
  • 0, 2.
  • 1, 1.

Question 25

Question
The magnitude condition for root locus is ............
Answer
  • |G(s)H(s)| = 0
  • |G(s)H(s)| = 2
  • |G(s)H(s)| = 1
  • |G(s)H(s)| = ∞

Question 26

Question
The angle condition is used for checking whether any point lies on root locus or not is...........
Answer
  • ± (2q + 1) 180°
  • ± (2q) 180°
  • ± (2q + 1) 360°
  • ± (2q) 360°

Question 27

Question
Which of the following statements is/are true?
Answer
  • Centroid may be a part of root locus
  • Centroid may not be a part of root locus
  • both 1 and 2
  • nether 1 nor 2

Question 28

Question
Transfer function of a control system depends on
Answer
  • initial conditions of input and output
  • system parameters alone
  • nature of output
  • nature of input

Question 29

Question
Negative feedback in a closed loop control system
Answer
  • reduce gain
  • improves disturbance rejection
  • reduce sensitivity to parameter variation
  • all of the above

Question 30

Question
The magnitude of a transfer function G(jω)H(jω) at gain cross over frequency is
Answer
  • 0
  • 1
  • infinity
  • any of the above
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