Process Control and Instrumentation MCQs

Question 1

Starting temperature of optical radiation pyrometer is __________ °C.

Accepted Answer

800

Answer

400

Answer

1200

Answer

1500

Question 2

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

Accepted Answer

U-tube

Answer

Bellows

Answer

Diaphragm

Answer

Bourdon tube

Question 3

The transfer function of a pure dead time system with dead time $${	au _{	ext{d}}}$$ is

Accepted Answer

$${{	ext{e}}^{ - {	au _{	ext{d}}}{	ext{s}}}}$$

Answer

$$\frac{1}{{{	au _{	ext{d}}}{	ext{s}} + 1}}$$

Answer

$${	au _{	ext{d}}}{	ext{s}} + 1$$

Answer

$${{	ext{e}}^{{	au _{	ext{d}}}{	ext{s}}}}$$

Question 4

Which of the following fluid flow measuring devices can measure the largest flow rate?

Accepted Answer

Weir

Answer

V-notch

Answer

Rotameter

Answer

Orificemeter

Question 5

The open loop transfer function of a control system is $$\frac{{{	ext{KR}}}}{{1 + {	ext{TS}}}}.$$ This represents

Accepted Answer

A first order system

Answer

Dead time system

Answer

A first order time lag

Answer

A second order system

Question 6

Radiation thermometer can not measure the temperature

Accepted Answer

Of liquid oxygen

Answer

Inside a pressure vessel

Answer

Of an object without coming in contact with it

Answer

Of moving objects at high temperature

Question 7

Load cells are used for the measurement of

Accepted Answer

Weight

Answer

Stress

Answer

Strain

Answer

Velocity

Question 8

Reset rate is the another term used for __________ time.

Accepted Answer

Integral

Answer

Dead

Answer

Derivative

Answer

None of these

Question 9

Which of the following flow-metering instruments is an area meter?

Accepted Answer

Rotameter

Answer

Venturimeter

Answer

Pitot tube

Answer

Hot wire anemometer