# Losses in a centrifugal compressor are due to

1.  inlet losses

2.  impeller channel losses

3.  diffuser losses

4.  all of the above

4

all of the above

Explanation :
No Explanation available for this question

# The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature

1.  0.1%

2.  0.5%

3.  1%

4.  5%

4

1\%

Explanation :
No Explanation available for this question

# The indicated work per unit mass of air delivered is

1.  directly proportional to clearance volume

2.  greatly affected by clearance volume

3.  not affected by clearance volume

4.  inversely proportional to clearance volume

4

not affected by clearance volume

Explanation :
No Explanation available for this question

# For actual single stage centrifugal compressor, the maximum pressure ratio is of the order of

1.  1 : 1.2

2.  1 : 2

3.  1 : 4

4.  1 : 10

4

1 : 4

Explanation :
No Explanation available for this question

# A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury

1.  the metal piece will simply float over the mercury

2.  the metal piece will be immersed in mercury by half

3.  whole of the metal piece will be immersed with its top surface just at mercury level

4.  metal piece will sink to the bottom

4

whole of the metal piece will be immersed with its top surface just at mercury level

Explanation :
No Explanation available for this question

# The angle of contact in case of a liquid depends upon

1.  the nature of the liquid and the solid

2.  the material which exists above the free surface of the liquid

3.  both a & b

4.  any one of the above

4

both a & b

Explanation :
No Explanation available for this question

# Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

2.  force of cohesion

3.  force of friction

4.  force of diffusion

4

force of cohesion

Explanation :
No Explanation available for this question

# Rain drops are spherical because of

1.  viscosity

2.  air resistance

3.  surface tension forces

4.  atmospheric pressure

4

surface tension forces

Explanation :
No Explanation available for this question

# Surface energy per unit area of a surface is numerically equal to:

1.  atmospheric pressure

2.  surface tension

4.  force of cohesion

4

surface tension

Explanation :
No Explanation available for this question

1.  1 mm

2.  5 mm

3.  10 mm

4.  30 mm

4