191. 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
E. any location

192. 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
E. none of the above

193. 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
E. none Of the above

194. 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
E. none of the above

195. 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
E. none of the above

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