Refrigeration Systems Mastery

Question 1

When discharge pressure of the compressor becomes excessive which one of the following operates

Accepted Answer

H.P. Cutout

Answer

L.P. Cutout

Answer

Both H.P. and L.P. Cutout

Answer

Oil pressure cutout

Question 2

The low pressure control protects the system against the following

Accepted Answer

All of these

Answer

Leak of air in the system

Answer

Extreme compression ratio

Answer

Freezing up of the evaporator

Question 3

For ice making, the ice can, after freezing are dipped in hot water, this process is known as

Accepted Answer

Thawing

Answer

Sensible heating

Answer

Sensible cooling

Answer

Cleaning of ice

Question 4

Non-ferrous metals are never used with one of the following refrigerants

Accepted Answer

$NH_3$

Answer

R-12

Answer

R-22

Answer

$CO_2$

Question 5

The butter prepared from the cream removed from the milk is stored at a temperature range of

Accepted Answer

-17.8 to $-33^\circ C$

Answer

0 to $10^\circ C$

Answer

-10.3 to $-5^\circ C$

Answer

10.5 to $15^\circ C$

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