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Day 2- Chemical Engineering Principles > Instrumentation and Process Control (IPC) > Flashcards

Instrumentation and Process Control (IPC) Flashcards

1
Q

Which of the following is an undesirable dynamic characteristic of an instrument?

A. Reproducibility
B. Dead zone
C. Time lag
D. Static error

A

C. Time lag

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2
Q

Pick out the one which is a first-order instrument

A. Mercury in glass thermometer (w/o any covering or air gap)
B. Bare metallic thermometer
C. Bare vapor pressure thermometer
D. All of the above

A

D. All of the above

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3
Q

Load cells are used for the measurement of

A

Weight

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4
Q

Which of the following is the dynamic characteristics of an instrument?

A. Reproducibility
B. Sensitivity
C. Dead zone
D. Fidelity

A

D. Fidelity

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5
Q

The ____ of a vapor pressure thermometer is a functioning element.

A

Pointer

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6
Q

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

A

Unstable

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7
Q

Thermistor has a high temperature coefficient of resistivity which is used as the sensing element in resistance thermometer. It is a/an

A

Solid semiconductor

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8
Q

Flapper nozzle is used in a/an _____ controller.

A

Pneumatic

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9
Q

Working principle of radiation pyrometer is based on the

A

Stefan-Boltzmann Law

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10
Q

Which of the following relates the emf generated in a single homogeneous wire to the temperature difference?

A. Peltier effect
B. Thomson effect
C. Seebeck effect
D. None of these

A

B. Thomson effect

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11
Q

Dilute wine was initially used as a thermometric liquid to develop temperature scale. The first empirical temperature scale developed was the ______ scale.

A

Fahrenheit

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12
Q

Which of the following is a desirable characteristic of an instrument?

A. High drift
B. High fidelity
C. High measuring lag
D. Poor reproducibility

A

B. High fidelity

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13
Q

The operation of a rotameter is based on

A

Variable flow area

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14
Q

The temperature of tempering oil baths maintained at 400 deg C during heat treatment of steel is measured by a/an _______ thermocouple.

A

Iron-constantan

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15
Q

Instrumentation in a plant offers the advantage of

A. Greater safety of operation
B. Better quality of product
C. Greater operation economy
D. All of these

A

D. All of these

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16
Q

Need not touch the object whose temperature is being measured

A

Radiation/infrared pyrometer

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17
Q

Thermal conductivity measurement comprises the working principle of a

A

CO2 analyzer

18
Q

Response of a system to a sinusoidal input is called _____ response.

A

Frequency

19
Q

The closed loop pole of a stable second order system could be

A

Both real and negative

20
Q

Smoke density of the flue gas going out of the chimney is measured by a

A

Photo electric cell

21
Q

Temperature measuring instruments are standardized mostly with ____ points of pure substances.

A. Melting
B. Boiling
C. Both a and b
D. Neither a and b

A

C. Both a and b

22
Q

Pick out the first-order system from among the following

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

B. Mercury in glass thermometer kept in boiling water

23
Q

The maximum service temperature for fibre glass used as thermocouple wire insulation material is _____ deg C.

A

500

24
Q

Which of the following controllers has the least maximum deviation?

A. P controller
B. P-I controller
C. P-I-D controller
D. P-D controller

A

D. P-D controller

25
Q

Volumetric expansion is the working principle of the ____ thermometers.

A

Mercury in glass

26
Q

Which of the following measurements can be made by the measurement of emf?

A. pH value
B. Degree of hydrolysis
C. Composition of complex ions
D. All of the above

A

D. All of the above

27
Q

A magnetic flowmeter is

A. Based on the principle of Faraday’s law
B. Capable if measuring the flow rate of slurries and electrolytes
C. Based on the linear rekationship between the fluid flow rate and the induced voltage
D. All of the above

A

D. All of the above

28
Q

Zirconia probe is used for the continuous measurement of _________ flue gases going out of the furnace.

A

Oxygen in

29
Q

Strain gage pressure transducers are used to measure ______ pressures.

A. Gage as well as vacuum
B. Absolute as well as differential
C. Both a and b
D. Neither a and b

A

C. Both a and b

30
Q

Compositional analysis of ______ is done using mass spectrometer.

A

An isotope

31
Q

The function of a transducer is to

A

Convert the primary signal into a more useful quantity, usually an electric impulse

32
Q

Which of the ff thermocouples will give yhe highest output for the same value of hot and cold junction temperature?

A. Platinum-platinum + rhodium
B. Iron-constantan
C. Chromel-constantan
D. All will give the same output

A

C. Chromel-constantan

33
Q

______ is undesirable in thermocouples used in industries.

A

Non-linear relation of emf to temperature

34
Q

Select the correct statement from the following

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 decreases with increasing frequency.

A

C. The amplitude ratio of a pure capacity process is inversely proportional to frequency

34
Q

Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a

A

Thermocouple

35
Q

The ____ of a vapor pressures thermometer is a secondary element.

A

Bourbon tube

36
Q

Emf develiped by a thermocouple while meaduring a temperature of 600 deg C is about 5.5 mV. The type of thermocouple used is

A

Platinum-platinum+rhodium

37
Q

Relates the absorption and evolution of heat at the junctions of a thermocouple to the current flow in the circuit

A

Peltier effect

38
Q

In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the _______ variable.

A

Manipulated

39
Q

Typical specifications for design stipulates the gain margin and phase margin to be respectively

A

> 1.7 and >30°

Day 2- Chemical Engineering Principles (9 decks)

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