VSSC MR & AC Technician Paper 2016

Vikram Sarabhai Space Center MR & AC Technician Paper 2016

If the rate of heat transfer is constant, it is known as
(a) steady- state heat transfer
(b) unsteady-state heat transfer
(c) uniform heat transfer
(d) non-uniform heat transfer

Which of the following refrigerant has the lowest freezing point?
(a) R-11
(b) R-12
(c) R-22
(d) Ammonia

The heat transfer by radiation takes place by means of
(a) Electromagnetic waves
(b) molecular energy interchanges
(c) flow of electrons
(d) flow of fluid

A body which absorbs all the radiations falling on it is called
(a) opaque body
(b) white body
(c) black body
(d) transparent body

Heat is absorbed by a refrigerant, during a refrigeration cycle in a
(a) condenser
(b) evaporator
(c) compressor
(d) throttle valve

In a vapor compression refrigeration cycle, the lowest temperature occurs in
(a) condenser
(b) evaporator
(c) Compressor
(d) throttle valve

The co-efficient of performance (COP) is defined as
(a) workdone on the system/ heat absorbed from the system
(b) Heat absorbed from the system/ work done on the system
(c) Heat absorbed-work done/ work done on the system
(d) Work done on the system/ heat absorbed-work done

The capacity of a refrigerator is 1 TR. This means that the heat removing capacity (on refrigeration effect) of the refrigerator is
(a) 1000 kcal/hr
(b) 2000 kcal/hr
(c) 3000 kcal/hr
(d) 4000 kcal/hr

In Electrolux refrigerator
(a) Hydrogen evaporates in ammonia
(b) Ammonia evaporates in hydrogen
(c) ammonia is absorbed in hydrogen
(d) ammonia is absorbed in water

critical temperature is the temperature above which
(a) a gas will immediately liquefy
(b) a gas will never liquefy
(c) water will evaporate
(d) None of the above