At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.

The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

A

More

B

Less

C

Some

D

Either more or less ; depends on the nature of vapor

Gases diffuse faster compared to liquids because of the reason that the liquid molecules

A

Are held together by stronger inter-molecular forces

B

Move faster

C

Have no definite shape

D

Are heavier

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally

A

Decreases

B

Increases

C

Remains unchanged

D

Increases exponentially

Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.

A

CO₂

B

SO₂

C

NH₃

D

None of these

Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is

A

Higher

B

Lower

C

Equal

D

Can't be compared

The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,

A

Will be higher

B

Will be lower

C

Will remain unaffected

D

May be higher or lower depending upon the nature of non-condensable gases

In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by

A

Convection

B

Radiation

C

Conduction

D

Both convection and conduction

Mr. Mamun bought 73 rolls of film. He can take 24 pictures with each roll of film. What is the total number of pictures he can take with 73 rolls of film ?

A

1,642

B

1,652

C

1,742

D

1,752

Which film has been awarded with best Environment film in 64th National film awards?

A

Kassav

B

Dashkriya

C

Ventilator

D

The tiger who crossed the line

Liquids and gases never show

A

diamagnetic property

B

paramagnetic property

C

ferromagnetic property

D

electromagnetic property

At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.

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