Question 1

When the initial conditions of a system are specified to be zero it implies that the system is

Accepted Answer

A)  at rest without any energy stored in it
B)  working normally with reference input
C)  working normally with zero reference input
D)  at rest but stores energy D

Question 2

Which of the following can be measured by LVDT?

Accepted Answer

A)  displacement
B)  velocity
C)  acceleration
D)  any of the above D

Question 3

In a control system integral error compensation _______ steady state error

Accepted Answer

A)  increases
B)  minimizes
C)  does not have any effect on
D)  any of the above B

Question 4

Which of the following is an electromagnetically device ?

Accepted Answer

A)  induction relay
B)  thermocouple
C)  lvdt
D)  any of the above

Question 5

Which of the following is the non-linearity caused by servomotor ?

Accepted Answer

A)  static friction
B)  backlash
C)  saturation
D)  none of the above

Question 6

A phase lag lead network introduces in the output

Accepted Answer

A)  lag at all frequencies
B)  lag at high frequencies and lead at low frequencies
C)  lag at low frequencies and lead at high frequencies
D)  none of the above

Question 7

The effect of error damping is to

Accepted Answer

A)  provide larger settling lime
B)  delay the response
C)  reduce steady state error
D)  any of the above

Question 8

A differentiator is usually not a part of a control system because it

Accepted Answer

A)  reduces damping
B)  reduces the gain margin
C)  increases input noise
D)  increases error

Question 9

An amplidyne can give which of the following characteristics ?

Accepted Answer

A)  constant current
B)  constant voltage
C)  constant current as well as constant voltage
D)  constant current, constant voltage and constant power

Question 10

If the gain of the critical damped system is increased it will behave as

Accepted Answer

A)  oscillatory
B)  critically damped
C)  overdamped
D)  underdamped

Question 11

In pneumatic control systems the control valve used as final control element converts

Accepted Answer

A)  pressure signal to electric signal
B)  pressure signal to position change
C)  electric signal to pressure signal
D)  position change to pressure signal

Question 12

Pressure error can be measured by which of the following ?

Accepted Answer

A)  differential bellows and straingauge
B)  selsyn
C)  strain gauge
D)  strain gauge and potentiometer

Question 13

Which of the following devices is used for conversion of co-ordinates ?

Accepted Answer

A)  microsyn
B)  selsyn
C)  synchro-resolver
D)  synchro-transformer

Question 14

technique gives quick transient and stability response

Accepted Answer

A)  root locus
B)  bode
C)  nyquist
D)  nichols

Question 15

can be extended to systems which are time-varying ?

Accepted Answer

A)  bode-nyquist stability methods
B)  transfer functions
C)  root locus design
D)  state model representatives

Exam 4: Pneumatic Control Systems and Control Elements