More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than

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

In an axial flow compressor, the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as

A

Work factor

B

Slip factor

C

Degree of reaction

D

Pressure coefficient

The minimum work required for a three stage reciprocating air compressor is ________ the work required for each stage.

A

Equal to

B

Double

C

Three times

D

Six times

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 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

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

In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in ________ of the piston.

A

One stroke

B

Two strokes

C

Three strokes

D

Four strokes

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

In a high pressure compressor, the delivery pressure is

A

1 to 5 bar

B

5 to 8 bar

C

8 to 10 bar

D

10 to 15 bar

More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than

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