Explanation: Absolute pressure is the sum of Gauge pressure and Atmospheric pressure. Also, Atmospheric pressure is measured from the datum level and Gauge pressure starts above the Atmospheric pressure.

Explanation: 1 Tonne Rating (TR) means that the capacity is such that it can convert 1 tonne of water to ice i.e. 0C in 24 hours.

= 3.5 KJ/s.

Explanation: Generally, unit like N/mm2, N/m2, KN/mm2 and MN/mm2 etc. are used but the S.I. unit used is N/m2 i.e. Pascal.

Explanation: As for Temperature 273 K= 0 C, i.e. 0 K = -273 C from the temperature scale developed by Celsius.

= 210 KJ/min (practically taken).

Explanation: For conversion of a unit from Celsius to Kelvin, 273 is to added, i.e. 35 + 273 = 308 K (here).

Explanation: KJ/s or KW is the S.I. unit of refrigeration, which is converted to Tonnes as commercial unit.

Explanation: 1 N/mm2 is also called 1 Pascal which is a measure of pressure. Hence to measure 1 Pascal of pressure the height of mercury found out practically was 760 mm. So 1 N/mm2 = 760 mm of Hg.

Explanation: The S.I. unit of Work done is Watt, i.e. Joule/Second. That means the amount of energy required in joules for unit time.