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.Management Sciences
Category: Steam Boilers, Engines, Nozzles and Turbines
The lenght of Cornish boiler is of the order of _________________?
A. 2-4 m
B. 3-5 m
C. 5-7.5 m
D. 7-9 m
E. 9-11 m
Water and sediment in fuel oil can be removed by _______________________?
A. heating the oil in the settling tanks
B. cooling the oil in the settling tanks
C. burning the oil
D. suspension
E. filtering
While steam expands in turbines, theoretically the entropy________________?
A. remains constant
B. increases
C. decreases
D. behaves unpredictably
E. none of the above
Film boling occurs at _______________________?
A. very low pressure
B. atmospheric pressures
C. medium pressures
D. very high pressures
E. none of the above
The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________?
A. wet
B. superheated
C. remain dry satruated
D. dry
E. none of the above
The diameter of cylindrical shell of the Lancashire boiler is of the order of__________________?
A. 1 tp 1.25m
B. 1 to 1.75 m
C. 2 to 4 m
D. 1.75 to 2.75 m
E. 2.25 to 4.5 m
At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?
A. maximum
B. minimum
C. zero
D. depends on temperature also
E. none of the above
Expanding steam to a very low pressure (high vacuum) in steam engines is _________________?
A. desirable
B. economical
C. essential
D. optional
E. uneconomical
The diameter of internal flue tubes in a Lancashire boiler compared to its shell is_________________?
A. one-half
B. one-third
C. one-fourth
D. one-fifth
E. two-fifth
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
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