Question 1
Question
The transfer function for tachometer E(S)/θ(S) is
Question 2
Question
Which of the following id the electrical analogous element for displacement in forcevoltage 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 forcecurrent 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?
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 ?
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 dashpot 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
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) = tet + 2 et (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

LeadLag

Laglead
Question 19
Question
A linear time invariant system, initially at rest when subjected to a unit step input gave response c(t) = tet (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
Question 24
Question
Type and order of transfer function G ( s ) = K / {s( s + 2 )}
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?
Question 28
Question
Transfer function of a control system depends on
Question 29
Question
Negative feedback in a closed loop control system
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