On-off control which is a special case of proportional control, has a band width of about _____________ percent?

A bolometer is __________________?

A. Used for the measurement of thermal radiation

B. An element which senses optical input and delivers thermal output

C. Both A. & B.

D. Neither A. nor B.

The time constant of a first order process with resistance R and capacitance C is__________________?

A. R + C

B. R – C

C. RC

D. 1/RC

Very low pressure is expressed in microns (μ), which is equal to ____________ mm of Hg column (absolute) at 0°C?

A. 0.0001

B. 0.001

C. 0.01

D. 0.1

What is the overall transfer function (C/R) of the following block diagram if G = G1. G2. G3 and H = H1.H2 ?

A. 1/(1 + GH)

B. G/(1 + GH)

C. H/(1 + GH)

D. G/(1 – GH)

Working principle of mercury in glass thermometer is based on the ______________ of mercury with increase in temperature?

A. Increase of pressure

B. Increase of thermal conductivity

C. Volumetric expansion

D. Differential linear expansion