Q1. It is required to produce large amount of steam at low pressure. Which boiler should be used ?
(a) pulverised fuel fired boiler
(b) cochran boiler
(c) lancashire boiler
(d) babcock and wilcox boiler
(e) stoker fired boiler.
Q2. The overall efficiency of thermal power plant is
(a) boiler efficiency, turhine efficiecny, generator efficiency
(b) all the three above plus gas cycle efficiency
(c) carnot cycle efficiency
(d) regenerative cycle efficiency
(e) rankine cycle efficiency.
Q3. Which type of boiler can meet rapid changes of load
(a) vertical fire tube type
(b) horizontal fire tube type
(c) horizontal water tube type
(d) vertical water tube type
(e) forced circulation type.
Q4. In forced 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 drum and through down-comers located in atmospheric condition 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 heated in a large number of tubes.
Q5. 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.
Q6. The radius of a dished head is taken approximately as
Q7. 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.
Q8. The heat loss in a boiler takes place in the form of
(a) heat carried away by flue gases
(b) heat carried away by ash
(c) moisture present in fuel and steam formed by combustion of hydrogen in fuel
(e) all of the above.
Q9. The major axis of elliptical manholes on the shell should be provided
(c) on dished end
Q10. In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine
(a) lancashire boiler
(b) locomotive boiler
(c) babcock and wilcox boiler
(d) cochran boiler
(e) benson boiler