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.Management Sciences
Category: Steam Boilers, Engines, Nozzles and Turbines
Which of the following is steam dbal?
A. non-coking bituminous coal
B. brown coal
C. pulverised coal
D. coking bituminous coal
E. none of the above
The latent heat of steam with increase of pressure__________________?
A. remains same
B. increases
C. decreases
D. behaves unpredictably
E. none of the above
The specific heat of superheated steam in kcal/kg is generally of the order of___________________?
A. 0.1
B. 0.3
C. 0.5
D. 0.8
E. 1.0
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
Thermal efficiency of a thermal power plant is of the order of___________________?
A. 15%
B. 20%
C. 30%
D. 45%
E. 60%.
Water at pressure of 4 kg/cm2 and 160°C temperature when exposed to atmosphere will_________________?
A. boil
B. flash i.e. get converted into steam
C. remain as it was
D. cool down
E. none of the above
Pulverized fuel is used for___________________?
A. better burning
B. more calorific value
C. less radiation loss
D. medium sized units
E. stoker fired boilers
Which of the following boilers is best suited to meet fluctuating demands___________________?
A. babcock and wilcox
B. locomotive
C. lancashire
D. cochran
E. comish
Sublimation region is the region where__________________?
A. solid and vapour phases are in equi-librium
B. solid and liquid phases are in equilibrium
C. liquid and vapour phases are in equilibrium
D. solid, liquid and vapour phases are in equilibrium
E. none of the above
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
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