REFRIGERATION AND AIR CONDITIONING QUIZ

Which of the following cycles uses air as the refrigerant?

Bell Coleman

Ericson

Stirling

Carnot

TRUE ANSWER : ?
YOUR ANSWER : ?

In S.J. unit, one ton of refrigeration is equal to

420 kJ/ min

21 kJ/ min

840 kJ/ min

210 kJ/ min

TRUE ANSWER : ?
YOUR ANSWER : ?

Ammonia absorption refrigeration cycle requires

Very little work input

Maximum work input

Zero work input

Nearly same work input as for vapour compression cycle

TRUE ANSWER : ?
YOUR ANSWER : ?

A standard ice point temperature corresponds to the temperature of

Ice at 4°C

Water at 0°C

Solid and dry ice

Mixture of ice and water under equilibrium conditions

TRUE ANSWER : ?
YOUR ANSWER : ?

The heat rejection factor (HRF) is given by

1 - C.O.P.

1 + (1/C.O.P)

1 + C.O.P

1 - (1/C.O.P)

TRUE ANSWER : ?
YOUR ANSWER : ?

An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by

1/e₁ + 1/e₂

(e₁ + e₂)/ e₁ + e₂ - e₁e₂

e₁e₂

e₁ + e₂

TRUE ANSWER : ?
YOUR ANSWER : ?

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

1/ B.P.F.

P.F. - 1

1 + B.P.F.

1 - B.P.F.

TRUE ANSWER : ?
YOUR ANSWER : ?

In aircraft, air refrigeration Cycle is used because of

Higher coefficient of performance

Low weight per tonne of refrigeration

High heat transfer rate

Low temperature at high altitudes

TRUE ANSWER : ?
YOUR ANSWER : ?

The C.O.P. of an absorption type refrigerator is given by (where T₁ = Temperature at which the working substance receives heat, T₂ = Temperature of cooling water, and T₃ = Evaporator temperature)

[T₃ (T₂ - T₃)] / [T₁ (T₁ - T₂)]

[T₃ (T₁ - T₂)]/ [T₁ (T₂ - T₃)]

[T₁ (T₂ - T₃)] / [T₃ (T₁ - T₂)]

[T₁ (T₁ - T₂)] / [T₃ (T₂ - T₃)]

TRUE ANSWER : ?
YOUR ANSWER : ?

Air refrigerator works on

Reversed Carnot cycle

None of these

Both (A) and (B)

Bell Coleman cycle

TRUE ANSWER : ?
YOUR ANSWER : ?

↑