Process Control and Instrumentation MCQ Questions and answers

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Q. Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

(A) Filling nitrogen under pressure in the stem
(B) Increasing the diameter of the tube
(C) Using steel tube in place of glass tube
(D) Accounting for the tube expansion

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Q. An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall. This is the working principle of a

(A) Polarograph
(B) Chromatograph
(C) Polarimeter
(D) PH meter

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Q. A negative gain margin expressed in decibels means a/an __________ system.

(A) Stable
(B) Unstable
(C) Critically damped
(D) None of these

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Q. Which of the following is not a mechanical pressure sensing element?

(A) Bellows
(B) Diaphragm
(C) Bourdon tube
(D) U-tube

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Q. Cascade control means

(A) Feed forward control
(B) More than one feed-back loop
(C) On-off control
(D) One feed-back loop

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Q. In second order underdamped system,

(A) Decay ratio = overshoot
(B) Decay ratio = (overshoot)²
(C) Overshoot increases for increasing damping co-efficient
(D) Large damping co-efficient means smaller damping

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Q. Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

(A) Mercury thermometer
(B) Radiation pyrometer
(C) Bimetallic thermometer
(D) Thermocouple

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Q. Transfer function of transportation lag is

(A) E^Ts
(B) E^-Ts
(C) Both A & B
(D) None of these

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Q. Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the

(A) Mercury in glass thermometer
(B) Optical pyrometer
(C) Iron-constantan thermocouple
(D) Alcohol filled thermometer

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Q. Mcleoid gauge is used to measure the

(A) Point velocity
(B) Flow rate
(C) Vacuum
(D) Pressure

Process Control and Instrumentation MCQs with answers Page - 3

Q. Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

Q. An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall. This is the working principle of a

Q. A negative gain margin expressed in decibels means a/an __________ system.

Q. Which of the following is not a mechanical pressure sensing element?

Q. Cascade control means

Q. In second order underdamped system,

Q. Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

Q. Transfer function of transportation lag is

Q. Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the

Q. Mcleoid gauge is used to measure the

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