If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

In a single acting reciprocating air compressor, without clearance, the compression of air may be

A

Isothermal

B

Polytropic

C

Isentropic

D

Any one of these

Volumetric efficiency of a compressor without clearance volume

A

Increases with increase in compression ratio

B

Decreases with increase in compression ratio

C

Is not dependent upon compression ratio

D

May increase/decrease depending on compressor capacity

Volumetric efficiency of a compressor with clearance volume

A

Increases with increase in compression ratio

B

Decreases with increase in compression ratio

C

In not dependent upon compression ratio

D

May increase/decrease depending on compressor capacity

In a single stage, single acting reciprocating air compressor without clearance volume, the work-done is maximum during

A

Isothermal compression

B

Isentropic compression

C

Polytropic compression

D

None of these

In a single stage, single acting reciprocating air compressor, without clearance volume, the work-done is minimum during

A

Isothermal compression

B

Isentropic compression

C

Polytropic compression

D

None of these

The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank, $$\theta $$ = Angle of inclination of crank with the line of stroke and n = Ratio of the length of connecting rod to radius of crank)

A

$${\text{m}}{\omega ^2}{\text{r}}\sin \theta $$

B

$${\text{m}}{\omega ^2}{\text{r}}\cos \theta $$

C

$${\text{m}}{\omega ^2}{\text{r}}\frac{{\sin 2\theta }}{{\text{n}}}$$

D

$${\text{m}}{\omega ^2}{\text{r}}\frac{{\cos2\theta }}{{\text{n}}}$$

The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank, $$\theta $$ = Angle of inclination of crank with the line of stroke and n = Ratio of the length of connecting rod to radius of crank)

A

$${\text{m}}{\omega ^2}{\text{r}}\sin \theta $$

B

$${\text{m}}{\omega ^2}{\text{r}}\cos \theta $$

C

$${\text{m}}{\omega ^2}{\text{r}}\frac{{\sin 2\theta }}{{\text{n}}}$$

D

$${\text{m}}{\omega ^2}{\text{r}}\frac{{\cos2\theta }}{{\text{n}}}$$

The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.

A

P, Q and R

B

P and R

C

R and S

D

P, R and S

With increase in compression ratio, the volumetric efficiency of air compressor

A

Increases

B

Decreases

C

Remains same

D

May increase or decrease (depends on the suction pressure)

A large clearance volume in a reciprocating compressor results in

A

Reduced volume flow rate

B

Increased volume flow rate

C

Lower suction pressure

D

Lower delivery pressure

If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

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