Practice Pakistan's most useful MCQs for competitive exams

The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter D. and shape & number of corrugations. Its deflection is proportional to_______________?

• (A)  d
• (B)  d2
• (C)  d3
• (D)  d4

Answer

Submitted By :Ali Uppal

Configuration of Bourdon spring tube is never made of _____________ shape?

• (A)  Circular
• (B)  Semi-circular
• (C)  Helical
• (D)  Spiral

Answer

Submitted By :Ali Uppal

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

• (A)  Piston type meter
• (B)  Rotameter
• (C)  Magnetic flow meter
• (D)  Orifice and tapered plug meter

Answer

Submitted By :Ali Uppal

The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by ____________________?

• (A)  Reducing value of Kc
• (B)  Introducing integral control
• (C)  Introducing derivative control
• (D)  None of the above

Answer

Submitted By :Ali Uppal

The experimental response of the controlled variable y(t) for a step change of magnitude ‘P’ in the manipulated variable x(t) is shown below: The appropriate transfer function of the process is_________________?

• (A)  (Q/P) e-(Q/R)S/(TdS + 1)
• (B)  (Q/R) e-TdS/(Q/P) (S + 1)
• (C)  (Q/P) e-TdS/(Q/R) (S + 1)
• (D)  (Q/R) e-(P/Q)S/(TdS + 1)

Answer

Submitted By :Ali Uppal

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

• (A)  Polarograph
• (B)  Thermal conductivity meter
• (C)  Photo electric cell
• (D)  Chromatograph

Answer

Submitted By :Ali Uppal

Measurement of sub-zero Celsius temperature in industry is done most commonly by __________________?

• (A)  Thermocouples
• (B)  Resistance thermometers
• (C)  Gas thermometers
• (D)  Bi-metallic thermometers

Answer

Submitted By :Ali Uppal

Which of the following is not the triple point of water ?

• (A)  32°R
• (B)  273°K
• (C)  492°R
• (D)  32°F

Answer

Submitted By :Ali Uppal

Flow rate through an orifice is _____________ the pressure differential?

• (A)  Proportional to
• (B)  Inversely proportional to the square root of
• (C)  Proportional to the square root of
• (D)  Inversely proportional to the square of

Answer

Submitted By :Ali Uppal

What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ?

• (A)  1
• (B)  > 1
• (C)  < 1
• (D)  None of these

Answer

Submitted By :Ali Uppal