A. chimney
B. induced draft fan
C. both combined A. and B.
D. steam jet draught
E. none of the above
Related Mcqs:
- In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine__________________?
A. lancashire boiler
B. locomotive boiler
C. babcock and wilcox boiler
D. cochran boiler
E. benson boiler - Efficiency of rankine cycle can be increased by_________________?
A. decreasing initial steam pressure and temperature
B. increasing exhaust pressure
C. decreasing exhaust pressure
D. increasing the expansion ratio
E. increasing number of regenerative heaters - Ignition timing of a multicylider petrol engine can be adjusted by_________________?
A. rotating the crank
B. adjusting the spark plug gap
C. adjusting ignition coil position
D. rotating the distributor
E. delaying the spark by increasing capacitor in ignition circuit - Recrystallisation temperature can belowered by_________________?
A. purification of metal
B. grain refinement
C. working at lower temperature
D. all of the above
E. none of the above - Coke is produced by__________________?
A. pulverising coal in inert atmosphere
B. heating wood in a limited supply of air at temperatures below 300GC
C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
D. binding the pulverised coal into brick-etts
E. enriching carbon in the coal - Hard coke is produced by carborisation of coal at_______________?
A. atmospheric temperature
B. 500-600°C
C. 70O-850°C
D. 95O-1100°C
E. 120O-1500°C - For water, at pressures below atmospheric___________________?
A. melting point rises slightly and boiling point drops markedly
B. melting point rises markedly and boiling point drops markedly
C. melting point drops slightly and boiling point drops markedly
D. melting point drops slightly and boiling point drops slightly
E. none of the above - Lancashire boiler is of____________________?
A. stationary<fire tube-type
B. horizontal type
C. natural cirulation type
D. internally fired type
E. all of the above - The ultimate analysis of fuel lists _____________________?
A. various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume
B. various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
C. fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
D. fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
E. moisture and ash free heating value - Gardually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of__________________?
A. higher effectiveness of boiler
B. high calorific value coal being burnt
C. fouling of heat transfer surfaces
D. raising of steam temperature
E. leakage of air
