Online Mechanical Engineering Test - Heat Transfer, Refrigeration and Air Conditioning Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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A refrigeration system

removes heat from a low temperature body and delivers it to a high temperature body

removes heat from a high temperature body and delivers it to a low temperature body

rejects energy to a low temperature body

none of the above

[#]

The condition of refrigerant after leaving the compressor and before entering the condenser is superheated vapour.

Yes

[#]

The automobile radiator is a heat exchanger of

parallel flow type

counter flow type

cross flow type

regenerator type

[#]

In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

parallel flow

counter flow

cross flow

all of these

[#]

Which of the following statement is correct for ammonia as a refrigerant?

It is toxic to mucous membranes.

it requires large displacement per TR compared to fluoro carbons.

It reacts with copper and its alloys.

all of these

[#]

The superheated vapour region, in a pressure enthalpy chart, is represented by the space

to the left of saturated liquid line

to the right of saturated liquid line

between the saturated liquid line and saturated vapour line

none of the above

[#]

The specific humidity during heating and humidification process.

remains constant

increases

decreases

[#]

The index which corelates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as

mean radiant temperature

effective temperature

dew point temperature

none of these

[#]

The alignment circle is marked on the psychrometric chart at

20°C DBT and 50% RH

26°C DBT and 50% RH

20°C DBT and 60% RH

26°C DBT and 60% RH

[#]

10.

The rato of energy transferred by convection to that by conduction is called

Stanton number

Nusselt number

Biot number

Peclet number

[#]

11.

A thermostatic expansion valve in a refrigeration system

ensures the evaporator completely filled with refrigerant of the load

is suitable only for constant load systems

maintains different temperatures in evaporator in proportion to load

none of the above

[#]

12.

The space between the two walls of a thermos flask is evacuated because vacuum is a __________ conductor of heat.

good

bad

[#]

13.

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

saturated liquid

wet vapour

dry saturated vapour

superheated vapour

[#]

14.

The humidification process, on the psychrometric chart is shown by

horizontal line

vertical line

inclined line

curved line

[#]

15.

A device used for transfering heat from one fluid to another is called heat exchanger.

True

False

[#]

16.

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

(C.O.P.)_P = (C.O.P.)_R + 2

(C.O.P.)_P = (C.O.P.)_R + 1

(C.O.P)_P = (C.O.P)_R - 1

(C.O.P)_P = (C.O.P)_R

[#]

17.

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

5°C

8°C

14°C

22°C

[#]

18.

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

same as

lower than

higher than

[#]

19.

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

horizontal Sine

vertical line

inclined line

curved line

[#]

20.

A condenser is used in the __________ pressure side of a refrigerating system.

low

high

[#]

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Online Mechanical Engineering Test - Heat Transfer, Refrigeration and Air Conditioning Test

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