A. heat transfer takes place across cylinder walls
B. work is done
C. steam may be wet, dry or superheated after expansion
D. all of the above
E. none of the above
Related Mcqs:
- In a throttling process_________________?
A. heat transfer takes place
B. work is done by the expanding steam
C. internal energy of steam changes
D. all of the above
E. none of the above - During storage, the heating value of coal __________________?
A. increases
B. decreases
C. remains constant
D. may increase or decrease depending upon the method of storage
E. none of the above - During the opening of a valve in a pipe line, the flow is_________________?
A. steady
B. unsteady
C. uniform
D. laminar
E. free vortex type - At very low temperature, the melting and boiling temperatures become equal. This temperature is____________________?
A. 373°K
B. 273.16°K
C. 303°K
D. 0°K.
E. 300°K - A wet vapour can be completely specified by__________________?
A. pressure only
B. temperature only
C. dryness fraction only
D. specific volume only
E. pressure and dryness fraction - In natural circulation type boiler _______________?
A. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
B. water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture of water and steam
C. feed pump is employed to supplement natural circulation in water wall type furnace
D. water is converted into steam in one . pass without any recirculation
E. water is fed at atmospheric pressure - Mechanical equivalent of heat for 1 kcal or Joule’s equivalent is equal to_________________?
A. 421 kgm
B. 421 kgm
C. 539 kgm
D. 102 kgm
E. 75 kgm - 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 - 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 - An economiser in a boiler______________________?
A. increases steam pressure
B. increases steam flow
C. decreases fuel consumption
D. decreases steam pressure
E. increases life of boiler
