26. 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. dew point temperature
C. dry bulb temperature
D. None of these
Read Also- Metrology, Basic definitions
27. If the energy radiated per second per sq. cm. of the surface for wavelengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called –
A. emissive power
B. emissivity
C. absorptive power
D. None of these
28. For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is –
A. 20
B. 25
C. 50
D. 100