The volumetirc efficiency of a compressor is calculated on the basis of __________________?

A. Volume of air inhaled at working conditions
B. Volume of air inhaled at n.t.p. conditions
C. Volume at 0°c and 1 kg/cm2
D. Volume at 20°c and 1 kg/cm2

For slow-speed large capacity compressor, following type of valve will be best suited________________?

A. Poppet valve
B. Mechanical valve of the corliss, sleeve, rotary or semirotary type
C. Disc or feather type
D. Any of the above

The compressor efficiecny is the__________________?

A. Isothermal h.p/indicated h.r
B. Isothermal h.p./shaft h.r
C. Total output/air input
D. Compression work/motor input

For a compressor, least work will be done if the compression is________________ ?

A. Isentropic
B. Isothermal
C. Polytropic
D. Somewhere in between isentropic and isothermal

To avoid moisture troubles, the branch connections from compressed air lines should be taken from_________________?

A. Top side of main
B. Bottom side of main
C. Left side of main
D. Right side of main

To aviod moisture troubles, the compressed air main line should __________________?

A. Rise gradually towards the point of use
B. Drop gradually towards the point of use
C. Be laid vertically
D. Be laid exactly horizontally

The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is_____________________?

A. Less
B. More
C. Same
D. More/less depending on compressor capacity

The thrust on the rotor in a centrifugal compressor is produced by________________?

A. Radial component
B. Axial component
C. Tangential component
D. Resultant component

A compressor at high altitude will draw________________?

A. More power
B. Less power
C. Same power
D. More/less power depending on other factors

A centrifugal compressor works on the principle of__________________?

A. Conversion of pressure energy into kinetic energy
B. Conversion of kinetic energy into pres¬sure energy
C. Centripetal action
D. Generating pressure directly