Expanding steam to a very low pressure (high vacuum) in steam engines is :
A. desirable
B. economical
C. essential
D. optional
E. uneconomical
Steam exhaust from high pressure turbine is reheated in :
A. boiler drum
B. superheater tubes
C. economiser
D. a separate coil
E. a separate coil located in convection path
The safety valve at superheater as compared to drum safety valve setting is set at :
A. higher value
B. lower value
C. same value
D. any value
E. none of the above
The pressure of reheat steam after passing through reheater compared to inlet condition is :
A. more
B. less
C. equal
D. may be more or less depending on capacity of reheater
E. none of the above
A safety valve in a locomotive starts leaking. The leaking medium will be :
A. water
B. dry steam
C. wet steam
D. super heated steam
E. supersaturated steam
The diameter of fire tubes in Cochran boiler is of the order of :
A. 2 cm
B. 6 Cm ,
C. 8 cm
D. 12 cm
E. 15 cm
With increase in load, radiant super heater has :
A. drooping characteristic
B. linear characteristic
C. rising characteristic
D. flat characteristic
E. none of the above
The major axis of elliptical manholes on the shell should be provided :
A. longitudinally
B. circumferentially
C. on dished end
D. anywhere
E. vertically
Size of boiler tubes is specified by :
A. mean diameter and thickness
B. inside diameter and thickness
C. outside diameter and thickness
D. outside diameter and inside diameter
E. outside diameter alone
Boiler stays are used to :
A. prevent flat surfaces under pressure from tearing apart
B. take care of failure in shear
C. take care of failure in compression
D. provide support for boiler
E. provide foundation of boiler
