Process Control and Instrumentation

A. Mercury in glass thermometer (without any covering or air gap)
B. Bare metallic thermometer
C. Bare vapor pressure thermometer
D. All A., B. and C.

A. Damped vibrator
B. Mercury in glass thermometer kept in boiling water
C. Interacting system of two tanks in series
D. Non-interacting system of two tanks in series

A. The frequency response of a pure capacity process is unbounded
B. The phase lag of a pure time delay system decreases with increasing frequency
C. The amplitude ratio of a pure capacity process is inversely proportional to frequency
D. The amplitude ratio of a pure time delay system increases with frequency

A. Proportional controller is normally used for level control in industrial applications
B. CSTR can be considered as a distributed parameter system
C. Distributed parameter approach gives partial differential equation
D. Non-linear behaviour is exemplified by an on-off controller

A. There is no transfer lag for a single first order system
B. Stirred tank with a water jacket exemplifies an interacting system
C. Transfer lag is a characteristic of all higher order systems (other than first order systems)
D. Transfer lag decreases as the number of stages decreases

A. 24
B. 18
C. 6
D. 36

A. Corner
B. Resonant
C. Cross-over
D. Natural

A. Liquid temperatures only
B. Very high temperatures only
C. Very low temperatures only
D. Both high and low temperatures

A. 1/2 S3
B. 2/S3
C. 1/S3
D. 2/S2

A. 180° – phase lag
B. Phase lag – 180°
C. Phase lag + 180°
D. Phase lag + 90°