VSSC Technician MR and AC Paper 2019

Vikram Sarabhai Space Centre Technician MR and AC Paper 2019

The insulation ability of an insulator with the presence of moisture would
(a) increase
(b) remain unaffected
(c) decrease
(d) may increase or decrease depending on temperature and thickness of insulation

Freon group of regrigerants are
(a) Toxic and polluting
(b) Non-toxic and non-inflammable
(c) Toxic, but not polluting
(d) Highly inflammable and highly polluting

In a refrigeration system the expansion device is connected between
(a) Receiver and evaporator
(b) Evaporatior and compressor
(c) Compressor and Condenser
(d) Condenser and receiver

The cycle of operation in a vapour compression refrigerator is
(a) Reversed carnot
(b) Reveresed Rankine
(c) Carnot
(d) Rankine

A domestic refrigerator uses the following type of device for expansion
(a) Thermostatic Valve
(b) Capillary tube
(c) Throttling Valve
(d) Pitot tube

Freon leak can be detected by
(a) Smelling
(b) Lighted match stick
(c) Sulphur Stick
(d) Halide torch

In an office room of 200 sq ft floor area with 4 persons and 4 computers, the capacity of air conditioner required is minimum
(a) 0.5 T
(b) 1 T
(c) 2 T
(d) 5 T

When the door of a domestic refrigerator is left open for a long time, what will happen?
(a) Room will get cooler
(b) Room will get hotter
(c) No change in room temperature
(d) More ice will form and Refrigerator will stop working

The full form of CFC is
(a) Chemically Freezing Carbides
(b) Cholor Fluro Carbons
(c) Carburyls and Freon Compounds
(d) Chlorinated Freon Compounds

The operation of a solenoid valve is by _______
(a) Pneumatically
(b) Oil pressure
(c) Electricity
(d) Permanent magnet

A reciprocating compressor in a refrigeration system has the following type of valve
(a) Poppet valve
(b) Solenoid valve
(c) Butterfly valve
(d) Globe valve or Rotary valve