REFRIGERATION AND AIR CONDITIONING QUIZ

The sensible heat factor during cooling and dehumidification process is given by (where h₁ = Enthalpy of air entering the cooling coil, h₂ = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process)

(hA - h2)/ (h1 - h2)

(hA - h1)/ (h2 - h1)

(h2 - hA)/ (h1 - h2)

(h1 - h2)/ (hA - h2)

TRUE ANSWER : ?
YOUR ANSWER : ?

A vapour absorption refrigerator uses _________ as a refrigerant.

Water

Ammonia

Aqua-ammonia

Freon

TRUE ANSWER : ?
YOUR ANSWER : ?

Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

0.25

1.25

0.8

0.5

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of sensible cooling of air, the coil efficiency is given by

P.F. - 1

1 - B.P.F.

1/ B.P.F.

1 + B.P.F.

TRUE ANSWER : ?
YOUR ANSWER : ?

If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be

More

Less

More/less depending on rating

Same

TRUE ANSWER : ?
YOUR ANSWER : ?

In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at

Low pressure side near receiver

Delivery of compressor

High pressure side close to receiver

Suction of compressor

TRUE ANSWER : ?
YOUR ANSWER : ?

Hydrogen is used in Electrolux refrigeration system so as to _________ the rate of evaporation of the liquid ammonia passing through the evaporator.

Increase

Reduce

None of these

Equalize

TRUE ANSWER : ?
YOUR ANSWER : ?

Reducing suction pressure in refrigeration cycle

Lowers evaporation temperature

Lowers compressor capacity because vapour is lighter

All of these

Increases power required per ton of refrigeration

TRUE ANSWER : ?
YOUR ANSWER : ?

Moisture in Freon refrigeration system causes

Corrosion of whole system

High power consumption

Freezing automatic regulating valve

Ineffective refrigeration

TRUE ANSWER : ?
YOUR ANSWER : ?

In a domestic vapour compression refrigerator, the refrigerant commonly used is

CO?

All of these

Ammonia

R-12

TRUE ANSWER : ?
YOUR ANSWER : ?

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