BSNL TTA ONLINE TEST - 3 Control System

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

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

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

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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BSNL TTA ONLINE TEST - 3 Control System

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Resource summary

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

Question 18

Question 19

Question 20

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30

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	Created by BSNL ACADEMY over 7 years ago

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	Copied by BSNL ACADEMY over 7 years ago