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4

The alignment circle is marked on the psychrometric chart at

A. 20°C DBT and 50% RH

B. 26°C DBT and 50% RH

C. 20°C DBT and 60% RH

D. 26°C DBT and 60% RH

Correct Answer :

B. 26°C DBT and 50% RH


Related Questions

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4

In a reversed Brayton cycle, the heat is absorbed by the air during

A. Isentropic compression process

B. Constant pressure cooling process

C. Isentropic expansion process

D. Constant pressure expansion process

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4

At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

A. Decreases

B. Increases

C. Remain same

D. Depends on other factors

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4

The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

A. Dry bulb temperature

B. Wet bulb temperature

C. Dew point temperature

D. Specific humidity

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4

In a vapour compression system, the condition of refrigerant before passing through the condenser is

A. Saturated liquid

B. Wet vapour

C. Dry saturated vapour

D. Superheated vapour

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4

In vapour compression cycle the condition off refrigerant is dry saturated vapour

A. After passing through the condenser

B. Before passing through the condenser

C. After passing through the expansion or throttle valve

D. Before entering the compressor

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4

Which of the following cycles uses air as the refrigerant?

A. Ericson

B. Stirling

C. Carnot

D. Bell Coleman

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4

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

A. In 1 hour

B. In 1 minute

C. In 24 hours

D. In 12 hours

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4

For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

A. Copper

B. Aluminium

C. Steel

D. Brass

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4

A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

A. Ammonia

B. Carbon dioxide

C. Freon

D. Brine

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4

The domestic refrigerator uses following type of compressor

A. Centrifugal

B. Axial

C. Miniature sealed unit

D. Piston type reciprocating

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4

Most air cooled condensers are designed to operate with a temperature difference of

A. 5°C

B. 8°C

C. 14°C

D. 22°C

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4

Pick up the wrong statement. A refrigerant should have

A. Tow specific heat of liquid

B. High boiling point

C. High latent heat of vaporisation

D. Higher critical temperature

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4

The lowest thermal diffusivity is of

A. Iron

B. Lead

C. Aluminium

D. Rubber

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4

A refrigerant compressor is used to

A. Raise the pressure of the refrigerant

B. Raise the temperature of the refrigerant

C. Circulate the refrigerant through the refrigerating system

D. All of the above

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4

Carbon dioxide is

A. Colourless

B. Odourless

C. Non-flammable

D. All of these

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4

The wet bulb temperature at 100% relative humidity is ________ dry bulb temperature.

A. Same as

B. Lower than

C. Higher than

D. None of these

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4

For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then

A. Bigger cabinet should be used

B. Smaller cabinet should be used

C. Perfectly tight vapour seal should be used

D. Refrigerant with lower evaporation temperature should be used

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4

In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)

A. B.P.F. - 1

B. 1 - B. P.F.

C. 1/ B.P.F.

D. 1 + B.P.F.

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4

Pressure of water vapour is given by

A. 0.622 Pv/ (Pb - Pv)

B. μ/[1 - (1 - μ) (Ps/Pb)]

C. [Pv (Pb - Pd)]/ [Pd (Pb - Pv)]

D. None of these

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4

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)

A. (td₁ -td₃)/( td₂ -td₃)

B. (td₂ -td₃)/( td₁ -td₃)

C. (td₃ -td₁)/( td₂ -td₃)

D. (td₃ -td₂)/( td₁ -td₃)

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4

The freezing point of R-12 is

A. -86.6°C

B. -95.2°C

C. -107.7°C

D. -135.8°C

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4

Rating of a domestic refrigerator is of the order of

A. 0.1 ton

B. 5 tons

C. 10 tons

D. 40 tons

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4

The C.O.P. of a Carnot refrigerator in winter will be _________ as compared to C.O.P. in summer.

A. Same

B. Lower

C. Higher

D. None of these

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4

One ton refrigeration corresponds to

A. 50 kcal/ min

B. 50 kcal/ hr

C. 80 kcal/ min

D. 80 kcal/ hr

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4

The temperature of ammonia after compression in a vapour compression system is

A. 20 to 50°C

B. 50 to 70°C

C. 70 to 110°C

D. None of these

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4

The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)

A. T₁ / (T₂ - T₁)

B. (T₂ - T₁)/T₁

C. (T₁ - T₂)/T₁

D. T₂/ (T₂ - T₁)

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4

A thermostatic expansion valve in a refrigeration system

A. Ensures the evaporator completely filled with refrigerant of the load

B. Is suitable only for constant load systems

C. Maintains different temperatures in evaporator in proportion to load

D. None of the above

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4

The desirable property of a refrigerant is

A. Low boiling point

B. High critical temperature

C. High latent heat of vaporisation

D. All of these

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4

The undesirable property of a refrigerant is

A. Non-toxic

B. Non-flammable

C. Non-explosive

D. High boiling point

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4

The wet bulb temperature during sensible heating of air

A. Remains constant

B. Increases

C. Decreases

D. None of these