Process Control and Instrumentation MCQs

Question 1

Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ °C.

Accepted Answer

> 100

Answer

0-100

Answer

< 0

Answer

> 50

Question 2

Which of the following is not a variable area flow meter?

Accepted Answer

Magnetic flow meter

Answer

Piston type meter

Answer

Rotameter

Answer

Orifice and tapered plug meter

Question 3

Meleoid gauge measures the __________ pressure.

Accepted Answer

Sub-atmospheric

Answer

Positive

Answer

Very high

Answer

Atmospheric

Question 4

Identify an unbounded input from inputs whose transfer functions are given below

Accepted Answer

$$\frac{1}{{{{	ext{S}}^2}}}$$

Answer

1

Answer

$$\frac{1}{{	ext{S}}}$$

Answer

$$\frac{1}{{{{	ext{S}}^2} + 1}}$$

Question 5

Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively

Accepted Answer

0° & 80°

Answer

- 273° & 80°

Answer

32° & 460°

Answer

32° & 80°

Question 6

The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.

Accepted Answer

All of the above

Answer

Pressure

Answer

Volume

Answer

Viscosity

Question 7

The unit of 'time constant' of a system is the same as that of

Accepted Answer

Time

Answer

Velocity

Answer

(Time) -1

Answer

None of these

Question 8

The fluid used in hydraulic controller is

Accepted Answer

Oil

Answer

Water

Answer

Steam

Answer

Air

Question 9

Time constant is the

Accepted Answer

Time taken by the controlled variable to reach 63.2% of its full change

Answer

Same as transportation lag

Answer

Same as dead time

Answer

Time required by the measured variable to reach 63.2% of its ultimate change