Vikram Sarabhai Space Centre MR&AC Technician Paper 2017
VSSC Technician Exam 2023 will be conducted on 20th Aug 2023 for the post Technician. If you are the aspirants of the said exam, then you must read this question paper for your practice.
For a domestic refrigerator the COP is
(a) More than 1
(b) Less than 1
(c) Equal to 1
(d) Unpredictable
According to Charle’s Law for a perfect Gas P=Pressure, V=Volume, T=Temperature, m=mass, R=gas constant, J= Joule’s coefficient, Cp=specific heat at constant pressure, Cv=specific heat at constant volume, C & n= Constant.
(a) V1T2=V2T1, if P is kept constant
(b) P1T2=T1P2, if V is kept constant
(c) P1V1=P2V2, if T is kept constant
(d) None of the above
How is the capacity of a refrigerating machine expressed?
(a) Inside volume of the cabinet
(b) Lowest temperature attained
(c) Rate of abstraction of heat from the space being cooled
(d) Gross weight of machine in tonnes
The critical pressure of a liquid is
(a) The pressure above which a liquid will explode
(b) The pressure above which a liquid will always convert into a vapour
(c) The pressure above which a liquid will remain a liquid
(d) The pressure below which a liquid will always be a vapour form
The highest temperature of refrigerant in a mechanical refrigeration system occurs
(a) Before expansion valve
(b) In evaporator
(c) Between evaportator and condenser
(d) Between compressor and condenser
What does the refrigerant exist as saturated liquid in a vapour compression cycle?
(a) After passing through the expansion valve
(b) After passing through the condesner
(c) Before passing through the condenser
(d) Before entering through the compressor
According to Dalton’s law, the total pressure of the mixture of gases is equal to
(a) Sum of the partial pressures of all divided by average molecular weight
(b) Sum of the partial pressure of all
(c) greater of the partial pressure of all
(d) average of the partial pressure of all
In a refrigeration cycle, a capillary tube is used
(a) to produce cooling effect
(b) to control the temperature of refrigerated space
(c) to convert refrigerant from liquid to vapour state
(d) to control the flow the refrigerant
Ammonia is preferred as refrigerant in large commercial installations because
(a) it has low latent heat
(b) it is non-toxic
(c) it is relatively cheap
(d) it has low working pressure
In order to obtain high C.O.P, pressure range of compressor should be
(a) low
(b) high
(c) optimum
(d) any value
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