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

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

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

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 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 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

During base load operation, the best method of controlling compressor is ___________________?

A. Start-stop motor
B. Constant speed unloader
C. Relief valve
D. Variable speed

The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________?

A. 0.1%
B. 0.5%
C. 1.0%
D. 5%

In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to ____________________?

A. N.t.p. conditions
B. Intake temperature and pressure conditions
C. 0°c and 1 kg/cm2
D. 20°c and 1 kg/cm2

The advantage of multistage compression over single stage compression is ________________?

A. lower power consumption per unit of air delivered
B. higher volumetric efficiency
C. decreased discharge temperature
D. mositure free air