Mechanical Engineering MCQs [Quiz 27]

Q1. With increase in load, radiant superheater has
(a) drooping characteristic
(b) lihear characterisstic
(c) rising characteristic
(d) flat characteristic
(e) none of the above.

Q2. With increase in load, convection superheater has
(a) drooping characteristic
(b) linear characterisstic
(c) rising characteristic
(d) flat characteristic
(c) none of the above.

Q3. The diameter of fire tubes in Cochran boiler is of the order of
(a) 2 cm
(b) 6 Cm 
(C) 8 cm
(d) 12 cm
(e) 15 cm.

Q4. In a recuperative air preheater, the heat is transferred
(a) from a metal wall from one medium to another
(b) from heating an itermediate material and then heating the air from this material
(c) by direct mixing ,
(d) heat is transferred by bleeding some gases from furnace
(e) none of the above.

Q5. A safety valve in a locomotive starts leaking. The leaking medium will be
(a) water
(b) dry steam
(c) wet steam
(d) super heated steam
(e) supersaturated steam.

Q6. The temperature of flue gases at air heater outlet should be
(a) 100°C
(b) above dew-point temperature of flue gases
(c) below dew-point temperature of flue gases
(d) less than wet bulb temperature of flue gases
(e) above wet bulb temperature of flue gases.

Q7. In regenerative air preheater, the heat is transferred
(a) from a metal wall from one medium to another
(b) from heating an intermediateanaterial and then heating the air from this material
(c) by direct mixing
(d) heat is transferred by bleeding some gas from furnace
(e) none of the above.

Q8. In designing air preheater, the important design consideration is that
(a) approach temperature should be as low as possible
(b) handling and maintenance should be easier
(c) heat transfer area should be optimum
(d) stack gases should not be cooled to the dew point
(e) none of the above.

Q9. The pressure of reheat steam after passing through reheater compared to inlet condition is
(a) more
(b) less
(c) equal
(d) may be more or less depending on capacity of reheater
(e) none of the above.

Q10. The function of injector used in small capacity boilers is to
(a) create vacuum
(b) inject chemical solution in feed pump
(c) pump water, similar to boiler feed pump
(d) add make up water in the system
(e) none of the above

Updated: 26th July 2019 — 9:42 PM

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