If p1, is the pressure of air entering the L.P. cylinder and p2 is the pressure of air leaving the L.P. cylinder (or inter-cooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D1 = Diameter of L.P. cylinder and D2 = Diameter of H.P. cylinder)

If p₁, is the pressure of air entering the L.P. cylinder and p₂ is the pressure of air leaving the L.P. cylinder (or inter-cooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D₁ = Dia. of L.P. cylinder, and D₂ = Dia. of H.P. cylinder)

A

D₁/D₂ = p₁ p₂

B

D₁/D₂ = p₁/p₂

C

D₁/D₂ = p₂/p₁

D

None of these

If p₁ is the pressure of air entering the L.P, cylinder and p₃ is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by

A

D₁/D₂ = (p₁ p₃)1/2

B

D₁/D₂ = (p₁/p₃)1/4

C

D₁/D₂ = (p₁ p₃)1/4

D

D₁/D₂ = (p₃/p₁)1/4

If p₁ is the pressure of air entering the L.P. cylinder and p₃ is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by

A

$$\frac{{{{\text{D}}_1}}}{{{{\text{D}}_2}}} = {\left( {{{\text{p}}_1}{{\text{p}}_3}} \right)^{\frac{1}{2}}}$$

B

$$\frac{{{{\text{D}}_1}}}{{{{\text{D}}_2}}} = {\left( {\frac{{{{\text{p}}_1}}}{{{{\text{p}}_3}}}} \right)^{\frac{1}{4}}}$$

C

$$\frac{{{{\text{D}}_1}}}{{{{\text{D}}_2}}} = {\left( {{{\text{p}}_1}{{\text{p}}_3}} \right)^{\frac{1}{4}}}$$

D

$$\frac{{{{\text{D}}_1}}}{{{{\text{D}}_2}}} = {\left( {\frac{{{{\text{p}}_3}}}{{{{\text{p}}_1}}}} \right)^{\frac{1}{4}}}$$

When the temperature of air leaving the inter-cooler, in a two stage compression with inter-cooler, is ________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.

A

Equal to

B

Less than

C

More than

D

None of these

For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p₂ is given by

A

p₂ = (p₁ + p₃)/2

B

p₂ = p₁. p₃

C

P₂ = Pa × p₃/p₁

D

p₂ = Pa p₃/p₁

For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is p_a, then the intermediate pressure p₂ is given by

A

$${{\text{p}}_2} = \frac{{{{\text{p}}_1} + {{\text{p}}_3}}}{2}$$

B

$${{\text{p}}_2} = \sqrt {{{\text{p}}_1}{{\text{p}}_3}} $$

C

$${{\text{p}}_2} = {{\text{p}}_{\text{a}}} \times \frac{{{{\text{p}}_3}}}{{{{\text{p}}_1}}}$$

D

$${{\text{p}}_2} = {{\text{p}}_{\text{a}}}\sqrt {\frac{{{{\text{p}}_3}}}{{{{\text{p}}_1}}}} $$

In a single stage, single acting reciprocating air compressor, without clearance, the work-done on the air during isentropic compression is ________ the heat required to raise the temperature of air from T₁ to T₂ at a constant pressure.

A

Equal to

B

Less than

C

Greater than

D

None of these

In a single stage, single acting reciprocating air compressor, without clearance, the work-done on the air during isentropic compression is ________ the heat required to raise the temperature of air from T₁ to T₂ at a constant pressure.

A

Equal to

B

Less than

C

Greater than

D

None of these

The inter-cooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Inter-cooler pressure, and p₃ = Delivery pressure of air)

A

p₂ = p₁ × p₃

B

p₂ = p₁/p₃

C

p₂ = p₁ × p₂

D

p₂ = p₃/p₁

The inter-cooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Inter-cooler pressure and p₃ = Delivery pressure of air)

A

$${{\text{p}}_2} = {{\text{p}}_1} \times {{\text{p}}_3}$$

B

$${{\text{p}}_2} = \frac{{{{\text{p}}_1}}}{{{{\text{p}}_3}}}$$

C

$${{\text{p}}_2} = \sqrt {{{\text{p}}_1} \times {{\text{p}}_2}} $$

D

$${{\text{p}}_2} = \frac{{{{\text{p}}_3}}}{{{{\text{p}}_1}}}$$

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