Home
Current Affairs January 2024

What is the correct answer?

4

During dehumidification process, the relative humidity

A. Remains constant

B. Increases

C. Decreases

D. None of these

Correct Answer :

C. Decreases


Related Questions

What is the correct answer?

4

The higher temperature in vapour compression cycle occurs at

A. Receiver

B. Expansion valve

C. Evaporator

D. Compressor discharge

What is the correct answer?

4

The difference between dry bulb temperature and dew point temperature, is called

A. Dry bulb depression

B. Wet bulb depression

C. Dew point depression

D. Degree of saturation

What is the correct answer?

4

Ammonia is

A. Non-toxic

B. Non-inflammable

C. Toxic and non-inflammable

D. Highly toxic and inflammable

What is the correct answer?

4

The optimum effective temperature for human comfort is

A. Higher in winter than in summer

B. Lower in winter than in summer

C. Same in winter and summer

D. Not dependent on season

What is the correct answer?

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

What is the correct answer?

4

Chaperon equation is applicable for registration at

A. Saturation point of vapour

B. Saturation point of liquid

C. Sublimation temperature

D. Triple point

What is the correct answer?

4

In aircraft, air refrigeration Cycle is used because of

A. Low weight per tonne of refrigeration

B. High heat transfer rate

C. Low temperature at high altitudes

D. Higher coefficient of performance

What is the correct answer?

4

The wet bulb depression indicates _________ humidity of the air.

A. Absolute

B. Relative

C. Specific

D. None of these

What is the correct answer?

4

Vertical lines on pressure-enthalpy chart show constant

A. Pressure lines

B. Temperature lines

C. Total heat lines

D. Entropy lines

What is the correct answer?

4

The coefficient of performance of a domestic refrigerator is ________ as compared to a domestic air-conditioner.

A. Same

B. Less

C. More

D. None of these

What is the correct answer?

4

The bypass factor of a cooling coil decreases with

A. Decrease in fin spacing and increase in number of rows

B. Increase in fin spacing and increase in number of rows

C. Increase in fin spacing and decrease in number of rows

D. Decrease in fin spacing and decrease in number of rows

What is the correct answer?

4

During adiabatic saturation process on unsaturated air __________ remains constant.

A. Relative humidity

B. Dew point temperature

C. Dry bulb temperature

D. Wet bulb temperature

What is the correct answer?

4

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

A. CO₂

B. Ammonia

C. R-12

D. All of these

What is the correct answer?

4

The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil, and td₃ = Dry bulb temperature of heating coil)

A. (td₂ - td₃)/(td₃ - td₁)

B. (td₃ - td₂)/(td₃ - td₁)

C. (td₃ - td₁)/(td₂ - td₃)

D. (td₃ - td₁)/(td₃ - td₂)

What is the correct answer?

4

One of the purposes of sub cooling the liquid refrigerant is to

A. Reduce compressor overheating

B. Reduce compressor discharge temperature

C. Increase cooling effect

D. Ensure that only liquid and not the vapour enters the expansion (throttling) valve

What is the correct answer?

4

Most of the domestic refrigerators work on the following refrigeration system

A. Vapour compression

B. Vapour absorption

C. Carnot cycle

D. Electrolux refrigerator

What is the correct answer?

4

During humidification process, dry bulb temperature

A. Remains constant

B. Increases

C. Decreases

D. None of these

What is the correct answer?

4

Mass flow ratio of NH₃ in comparison to Freon12 for same refrigeration load and same temperature limits is of the order of

A. 1 : 1

B. 1 : 9

C. 9 : 1

D. 1 : 3

What is the correct answer?

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

What is the correct answer?

4

Which of the following refrigerant has the lowest freezing point?

A. R-11

B. R-12

C. R-22

D. Ammonia

What is the correct answer?

4

During cooling and dehumidification, dry bulb temperature

A. Remains constant

B. Increases

C. Decreases

D. None of these

What is the correct answer?

4

Which of the following refrigerant is highly toxic and flammable?

A. Ammonia

B. Carbon dioxide

C. Sulphur dioxide

D. R-12

What is the correct answer?

4

As relative humidity decreases, the dew point temperature will be ________ wet bulb temperature.

A. Same as

B. Lower than

C. Higher than

D. None of these

What is the correct answer?

4

It is desired to condition the outside air from 70% relative humidity and 45° C dry bulb temperature to 50% relative humidity and 25° C dry bulb temperature (room condition). The practical arrangement will be

A. Dehumidification

B. Cooling and humidification

C. Cooling and dehumidification

D. Dehumidification and pure sensible cooling

What is the correct answer?

4

The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by

A. (C.O.P.)P = (C.O.P.)R + 2

B. (C.O.P.)P = (C.O.P.)R + 1

C. (C.O.P)P = (C.O.P)R - 1

D. (C.O.P)P = (C.O.P)R

What is the correct answer?

4

Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

A. These react with water vapour and cause acid rain

B. These react with plants and cause greenhouse effect

C. These react with oxygen and cause its depletion

D. These react with ozone layer

What is the correct answer?

4

During sensible cooling of air, specific humidity

A. Remains constant

B. Increases

C. Decreases

D. None of these

What is the correct answer?

4

Carbon dioxide is

A. Colourless

B. Odourless

C. Non-flammable

D. All of these

What is the correct answer?

4

The humidity ratio or specific humidity is the mass of water vapour present in

A. 1 m3 of wet air

B. 1 m3 of dry air

C. 1 kg of wet air

D. 1 kg of dry air

What is the correct answer?

4

The specific humidity during heating and humidification process.

A. Remains constant

B. Increases

C. Decreases

D. None of these