If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called
A. absorptive power
B. emissive power
C. emissivity
D. none of the above
Answer B
The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called
A. wet bulb temperature
B. dry bulb temperature
C. dew point temperature
Answer A
R-12 is generally preferred over R-22 in deep freezers since
A. it has low operating pressures
B. it gives higher coefficient of performance
C. it is miscible with oil over large range of temperatures
D. all of the above
Answer C
The evaporator used in house-hold refrigerators is
A. frosting evaporator
B. non-frosting evaporator
C. defrosting evaporator
The pressure at the outlet of a refrigerant compressor is called
A. suction pressure
B. discharge pressure
C. critical pressure
D. back pressure
