Clearance volume in actual reciprocating compressors is essential

A To accommodate Valves in the cylinder head
B To provide cushioning effect
C To attain high volumetric efficiency
D To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

Correct Answer: To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

Clearance volume in actual reciprocating compressors is essential To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head
Bissoy MCQ
#Mechanical Engineering #Compressors #Gas Turbines And Jet Engines

Related Questions

Centrifugal compressors compared to reciprocating compressors
A Require less space
B Have quieter operation
C Have lower operating costs
D All of the above
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 volumetric efficiency for reciprocating air compressors is about
A 10 to 40%
B 40 to 60%
C 60 to 70%
D 70 to 90%
The reciprocating refrigerant compressors are very suitable for
A Small displacements and low condensing pressures
B Large displacements and high condensing pressures
C Small displacements and high condensing pressures
D Large displacements and low condensing pressures
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
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
There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called
A Wet steam
B Saturated steam
C Superheated steam
D Cushion steam
If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by
A $$1 - {\text{K}} + {\text{K}}{\left( {\frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}}} \right)^{\frac{1}{{\text{n}}}}}$$
B $$1 + {\text{K}} - {\text{K}}{\left( {\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}} \right)^{\frac{1}{{\text{n}}}}}$$
C $$1 - {\text{K}} + {\text{K}}{\left( {\frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}}} \right)^{\frac{{{\text{n}} - 1}}{{\text{n}}}}}$$
D $$1 + {\text{K}} - {\text{K}}{\left( {\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}} \right)^{\frac{{{\text{n}} - 1}}{{\text{n}}}}}$$

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