REFRIGERATION AND AIR CONDITIONING QUIZ

Refrigeration in aeroplanes usually employs the following refrigerant

Air

Freon-22

Freon-11

CO2

TRUE ANSWER : ?
YOUR ANSWER : ?

The optimum effective temperature for human comfort is

Not dependent on season

Higher in winter than in summer

Same in winter and summer

Lower in winter than in summer

TRUE ANSWER : ?
YOUR ANSWER : ?

The dehumidification process, on the psychrometric chart, is shown by

Curved line

Horizontal line

Inclined line

Vertical line

TRUE ANSWER : ?
YOUR ANSWER : ?

During cooling and dehumidification, dry bulb temperature

Remains constant

None of these

Increases

Decreases

TRUE ANSWER : ?
YOUR ANSWER : ?

The bypass factor, in case of sensible cooling of air, is given by (where td₁ = Dry bulb temperature of air entering the cooling coil, td₂ = Dry bulb temperature of air leaving the cooling coil, and td₃ = Dry bulb temperature of the cooling coil)

(td₂ -td₃)/( td₁ -td₃)

(td₁ -td₃)/( td₂ -td₃)

(td₃ -td₁)/( td₂ -td₃)

(td₃ -td₂)/( td₁ -td₃)

TRUE ANSWER : ?
YOUR ANSWER : ?

In a refrigerating machine, heat rejected is _________ heat absorbed.

Equal to

None of these

Less than

Greater than

TRUE ANSWER : ?
YOUR ANSWER : ?

The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will

Remain unaffected

Decrease

May increase or decrease depending on the type of refrigerant used

Increase

TRUE ANSWER : ?
YOUR ANSWER : ?

The vapour compression refrigerator employs the following cycle

Carnot

Reversed Rankine

Reversed Carnot

Rankine

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One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice

In 12 hours

In 24 hours

In 1 minute

In 1 hour

TRUE ANSWER : ?
YOUR ANSWER : ?

A one tonne refrigerating machine means that

One tonne of ice when melts from and at 0° C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min

One tonne is the total mass of machine

One tonne refrigerant is used

One tonne of water can be converted into ice

TRUE ANSWER : ?
YOUR ANSWER : ?