Deck 4: Pneumatic Control Systems and Control Elements

Question 1

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

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

Answer 1

pressure signal to position change

Question 2

Pressure error can be measured by which of the following ?

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

Answer 2

differential bellows and straingauge

Question 3

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

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

Answer 3

synchro-resolver

Question 4

The effect of error damping is to

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

Question 5

technique gives quick transient and stability response

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

Question 6

A phase lag lead network introduces in the output

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

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

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

Question 8

can be extended to systems which are time-varying ?

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

Question 9

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

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

Question 10

Which of the following is an electromagnetically device ?

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

Question 11

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

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

Question 12

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

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

Question 13

In a control system integral error compensation _______ steady state error

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

Question 14

An amplidyne can give which of the following characteristics ?

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

Question 15

Which of the following can be measured by LVDT?

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