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

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

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

Change of angle of refraction with composition comprises the working principle of a___________________?

A. Polarimeter

B. Polarograph

C. Spectrometer

D. Refractometer