Mechanical Engineering MCQs [Quiz 25]

Q1. The number of drums in Benson steam generator is
(a) one
(b) two
(c) one steam drum and one water drum
(d) no drum
(e) none of the above.

Q2. A fusible plug is fitted in small boilers in order to
(a) avoid excessive build up of pressure
(b) avoid explosion
(c) extinguish fire if water level in the boiler falls below alarming limit
(d) control steam dome
(e) remove molten aslj.

Q3. The fusible plug in small boilers is located
(a) in the drum
(b) in the fire tubes
(c) above steam dome
(d) over the combustion chamber
(e) at the inlet of chimney.

Q4. Fusible plug for boilers is made of fusible metal containing tin, lead, and
(a) bismuth
(b) copper
(c) aluminium
(d) nickel
(e) iron.

Q5. Boiler H.P. is defined as the
(a) steam evaporation rate per kg of fuel fired
(b) work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam
(c) the evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam
(d) work done by 1 kg of steam at saturation condition
(e) heat consumed in evaporating 1 kg water at 0°C to steam at 100°C and 1.033 kg/cm pressure.

Q6. In forced recirculation 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) heating of water takes place in stages.

Q7. The ratio of heat utilised to produce steam and the heat liberated in furnace is known as
(a) boiler effectiveness
(b) boiler evaporative capacity
(c) factor of evaporation
(d) equivalent evaporation
(e) boiler efficiency.

Q9. Steam in water tube boiler as compared to fire tube boiler
(a) can be raised rapidly
(b) is raisd at slower rate
(c) is raised at same rate
(d) could be raised at fast/slow rate depending on design
(e) none of the above is true.

Q10. Thermal efficiency of well maintained boiler will be of the order
(a) 20%
(b) 40%
(c) 50%
(d) 75%
(e) 90%

Updated: 25th July 2019 — 10:18 PM

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