Which of the following can be used to create a flow of gas, where no significant compression is required?

The density of a gas 'X' is twice that of another gas 'Y'. If the molecular weight of gas 'Y' is 'M'; then the molecular weight of the gas 'X' will be

A

2M

B

$$\frac{{\text{M}}}{2}$$

C

M

D

$$\frac{{\text{M}}}{4}$$

দুটি এক-পরমাণুক আদর্শ গ্যাস পরস্পরের সাথে তাপীয় সাম্যাবস্থায় আছে। A গ্যাস m ভরের অণু দ্বারা গঠিত, এবং B গ্যাস 4m ভরের অণু দ্বারা গঠিত। A গ্যাসের আয়তন ৪ গ্যাসের আয়তনের দ্বিগুণ। এদের চাপের অনুপাত PA / PB কত? (Two monoatomic ideal gases are in thermal equilibrium with each other. Gas A is composed of molecules with mass m while gas B is composed of molecules with mass 4m. The volume of gas A is twice that of gas B. What it the ratio of their pressures PA / PB ?)

A

1/4

B

1/2

C

1

D

2

With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop

A

Decreases

B

Remains unchanged

C

Increases

D

Decreases exponentially

Highest useful compression ratio (HUCR) is the highest compression ratio at which the

A

Engine can run

B

Engine gives maximum output

C

Engine is most efficient

D

Fuel can be used in a test engine without knocking

The work done in isothermal compression compared to that in adiabatic compression will be

A

Less

B

More

C

Same

D

More or less depending upon the extent of work done

Ratio of permissible stress in direct compression and bending compression is

A

Less than 1

B

Between 1 and 1.5

C

Between 1.5 and 2.0

D

Greater than 2

The advantage of multistage compression over single stage compression is

A

Lower power consumption per unit of air delivered

B

Higher volumetric efficiency

C

Decreased discharge temperature

D

All of the above

For minimum work in multistage compression, assuming same index of compression in all stages

A

Work done in first stage should be more

B

Work done in subsequent stages should increase

C

Work done in subsequent stages should decrease

D

Work done in all stages should be equal

For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

A

Increase

B

Decrease

C

Remain unaffected

D

Other factors control it

The temperature of ammonia after compression in a vapour compression system is

A

20 to 50°C

B

50 to 70°C

C

70 to 110°C

D

None of these

Which of the following can be used to create a flow of gas, where no significant compression is required?

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