IPRC Refrigeration & Air-Conditioning Technician Paper 2018

ISRO Propulsion Complex Mahendragiri Refrigeration & Air-Conditioning Technician Paper 2018
Date of Exam – 22nd April 2018
Duration of Exam – 1 Hour 30 Minutes
No. of questions – 60 Nos.

Thermostat function by sensing __________
(a) Pressure
(b) Temperature
(c) Flow
(d) Speed

Which one of the following is a CFC refrigerant?
(a) R744
(b) R290
(c) R502
(d) R718

Coomonly used refrigerant in commercial ice plant is ___________
(a) CO2
(b) Freon 12
(c) Ammonia
(d) Air

An air washer can work as ____________
(a) Humidifier
(b) Dehumidifier
(c) Filter
(d) All of the above

In sensible cooling process, the moisture content __________
(a) Decreases
(b) Increases
(c) Remains constant
(d) None of the above

Sling psychrometer is used to measure ______
(a) Only dry bulb temperature
(b) Only wet bulb temperature
(c) Dry and wet bulb temperature
(d) Relative humidity

Latent heat of fusion of ice is _______
(a) 335 kJ/kg
(b) 835 kJ/kg
(c) 555 kJ/kg
(d) All of the above

Process of changing solid into vapour state without passing through liquid state is ___________
(a) Boiling
(b) Sublimation
(c) Sub cooling
(d) Freezing

Amount of heat required to raise the temperature of unit quantity of substance through one degree is called
(a) C.T.U
(b) B.T.U
(c) Calorie
(d) Specific heat

The process in winter air conditioning is _________
(a) Dehumidification
(b) Heating and humidification
(c) Humidification
(d) Cooling and dehumidification