# 1 m of air at atmospheric condition weighs approximately

1.  0.5 kg

2.  1.0 kg

3.  1.3 kg

4.  2.2 kg

4

1.3 kg

Explanation :
No Explanation available for this question

# Adiabatic compression is one in which

1.  temperature during compression remains constant

2.  no heat leaves or enters the compressor cylinder during compression

3.  temperature rise follows a linear relationship

4.  work done is maximum

4

no heat leaves or enters the compressor cylinder during compression

Explanation :
No Explanation available for this question

# The capacity of a compressor is 5 m /min refers to

1.  standard air

2.  free air

3.  compressed air

4.  compressed air at delivery pressure

4

free air

Explanation :
No Explanation available for this question

# The overall isothermal efficiency of compressor is defined as the ratio of

1.  isothermal h.p. to the BHP of motor

2.  isothermal h.p. to adiabatic h.p.

3.  power to drive compressor to isothermal h.p.

4.  work to compress air isothermally to work for actual compression

4

isothermal h.p. to the BHP of motor

Explanation :
No Explanation available for this question

# The most efficient method of compressing air is to compress it

1.  isothermally

3.  isentropically

4.  isochronically

4

isothermally

Explanation :
No Explanation available for this question

# Maximum work is done in compressing air when the compression is

1.  isothermal

3.  polytropic

4.  any one of the above

4

Explanation :
No Explanation available for this question

# The pressure and temperature conditions of air at the suction of compressor are

1.  atmospheric

2.  slightly more than atmospheric

3.  slightly less than atmospheric

4.   pressure slightly less than atmospheric and temperature slightly more than atmospheric

4

pressure slightly less than atmospheric and temperature slightly more than atmospheric

Explanation :
No Explanation available for this question

# Isothermal compression efficiency can be attained by running the compressor

1.  at very high speed

2.  at very slow speed

3.  at average speed

4.  at zero speed

4

at very slow speed

Explanation :
No Explanation available for this question

# The compressor capacity with decrease in suction temperature

1.  increases

2.  decreases

3.  remains unaffected

4.  may increase or decrease depending on compressor capacity

4

increases

Explanation :
No Explanation available for this question

# Isothermal compression efficiency, even when running at high speed, can be approached by using

1.  multi-stage compression

2.  cold water spray

3.  both(a) and(b) above

4.  fully insulating the cylinder

4