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Nichols chart can be used to determine
A) Steady state response

B) Closed loop frequency response

C) Time response

D) Open loop frequency response

State variable approach is applicable to
A) Linear time invariant systems
C) Non linear systems

If gain margin of a system is 0 dB, then the
A) Stable
C) Conditionally stable

The root locus originates from
A) Open loop zeros
C) Open loop poles

129/22

B) Linear time variant systems
D) All the above systems

system ‏5ا‎
‎B) Marginally stable
D) Unstable

B) Closed loop zeros
D) Closed loop poles

Alcohol is pumped through a pipe of 10 cm diameter at 4 m/s flow velocity. Find the

volume flow rate.
A) 0.0314 m3/s
C) 0.0016 m/s

8( 8
D) 314 5

The standard measuring range of a sensor is 4—20 mA. If we have a set point value
of 13 mA and a measurement of 12.5 mA, calculate the percent of span error.

A) 3.125
௦) 25

Controller with maximum stabilising time
A) P B) Pl

8) -3.125
ഉ) _ 2.5
‏مم ره‎ D) PID

In a proportional controller offset can be decreased by

A) Larger differential gain
C) Larger proportional gain

B) Smaller proportional gain
D) Smaller differential gain

Which of the following statements are true regarding flashing ?
A) Valve outlet pressure is greater than the vapour pressure of the process liquid
B) Valve outlet pressure is less than or equal to the vapour pressure of the

process liquid
C) Independent of vapour pressure
D) None of the above