Process Control And Instrumentation Mcqs
Q.1: Pick out the one which is a first order instrument ?4
A. Mercury in glass thermometer (without any covering or air gap)>
B. Bare metallic thermometer
C. Bare vapor pressure thermometer
D. All , and
Q.2: Pick out the first order system from among the following ?:
A. Damped vibrator
B. Mercury in glass thermometer kept in boiling water2
C. Interacting system of two tanks in series)
D. Non-interacting system of two tanks in series-
Q.3: Select the correct statement from the following?0
A. The frequency response of a pure capacity process is unbounded>
B. The phase lag of a pure time delay system decreases with increasing frequencyM
C. The amplitude ratio of a pure capacity process is inversely proportional to frequencyU
D. The amplitude ratio of a pure time delay system increases with frequencyH
Q.4: Pick out the wrong statement ?
A. Proportional controller is normally used for level control in industrial applicationsU
B. CSTR can be considered as a distributed parameter system8
C. Distributed parameter approach gives partial differential equationB
D. Non-linear behaviour is exemplified by an on-off controller;
Q.5: Pick out the wrong statement?
A. There is no transfer lag for a single first order system8
B. Stirred tank with a water jacket exemplifies an interacting systemB
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 decreases8
Q.6: The time taken for a radioactive element to reduce to 50% of its original weight is _____________ years, if its half life period is 12 years?
A. 24
B. 18
C. 6
D. 36
Q.7: The frequency at which maximum amplitude ratio is attained is called the ______________ frequency?b
A. Corner
B. Resonant
C. Cross-over
D. Natural
Q.8: Thermocouple is suitable for measuring_________________?8
A. Liquid temperatures only
B. Very high temperatures only
C. Very low temperatures only
D. Both high and low temperatures
Q.9: For the time domain function f(t) = t, the Laplace transform of 0 t f(t) dt is given by___________________?n
A. 1/2 S3
B. 2/S3
C. 1/S3
D. 2/S2
Q.10: Phase margin is equal to_______________?(
A. 180 phase lag
B. Phase lag 180
C. Phase lag + 180
D. Phase lag + 90

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