A. increases
B. decreases
C. remains constant
D. may increase or decrease depending upon the method of storage
E. none of the above
Related Mcqs:
- Heating wet steam at constant temperature is heating it at constant_________________?
A. volume
B. pressure
C. entropy
D. enthalpy
E. none of the above - Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value ___________________?
A. (1- moisture content)
B. (1 + moisture content)
C. 1 + moisture content
D. 1 – moisture content - Calorific value of coal is of the order of _______________________?
A. 200-400 kcal/kg
B. 800-1200 kcal/kg
C. 2000-4000 kcal/kg
D. 5000-8000 kcal/kg
E. 8000-10,000 kcal/kg - Heating of dry steam above saturation temperature is known as_____________________?
A. enthalpy
B. superheating
C. supersaturation
D. latent heat
E. super tempering - The relative heat absorption for successively added equal areas of boiler convection heating surfaces____________________?
A. increases
B. decreases
C. remains unaffected
D. first increases and then decreases
E. first decreases and then increases - The alloy used for making electrical resistances and heating elements is____________________?
A. nichrome
B. invar
C. magnin
D. elinvar
E. peiminvar - The coal requirement per kW hour generation in the thermal power plant is of the order of__________________?
A. 0.1 to 0.2 kg
B. 0.2 to 0.4 kg
C. 0.6 to 0.8 kg
D. 1.0 to 1.5 kg
E. 1.5 to 2 kg - Which is not the correct statement about moisture in coal ______________________?
A. inherent moisture and surface mois¬ture are different things
B. in some coals moisture may be present upto 40%
C. some moisture in coal helps in better burning which is not possible with completely dry coal
D. it increases thermal efficiency
E. moisture in coal is removed before firing by heating it with hot air - Green coal, in order to be burnt, must be____________________?
A. heated sufficiently
B. burnt in excess air
C. heated to its ignition point
D. burnt as powder
E. burnt as lumps - Sulphur in coal results in___________________?
A. causing clinkering and slagging
B. corroding air heaters
C. spontaneous combustion during coal storage
D. facilitating ash precipitation
E. all of the above
