Steam Engines objective questions with answers part7

Q1. 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

Q2. 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

Q3. 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

Q4. 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

Q5. 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

Q6. 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

Q7. 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

Q8. The safety valve at super heater as compared to drum safety valve setting is set at
(A) higher value
(B) lower value
(C) same value
(D) any value

Q9. The height of chimney in a power plant is governed by
(A) the draft to be created
(B) limitation of construction facilities
(C) control of pollution
(D) quantity of flue gases to be handled

Q10. Steam exhaust from high pressure turbine is reheated in
(A) boiler drum
(B) super heater tubes
(C) a separate coil
(D) a separate coil located in convection path

Q11. Vacuum for reciprocating steam engines compared to steam turbines is
(A) more
(B) equal
(C) less
(D) could be more or less depending on the size of plant

Q12. Expanding steam to a very low prseeure (high vacuum) in steam engines is
(A) desirable
(B) economical
(C) essential
(D) uneconomical

Q13. In locomotives, the draught is produced by
(A) chimney
(B) induced draft fan
(C) both combined and
(D) steam jet draught

Q14. Reheating of steam under ideal conditions takes place at constant
(A) entropy
(B) enthalpy
(C) pressure
(D) temperature

Q15. The maximum discharge through a chimney occurs when the height of chimney is
(A) infinitely long
(B) around 200 meters
(C) equal to the height of the hot gas column producing draught
(D) outside temperature is very low

Q16. Proximate analysis of fuel is determination of percentage of
(A) carbon, hydrogen, nitrogen, sulphur, moisture
(B) fixed carbon, ash, volatile matter, moisture
(C) higher calorific value
(D) lower calorific value

Q17. Which device is used in thermal power plants to reduce level of pollution
(A) induced draft fan
(B) smoke meter
(C) chimney
(D) precipitator

Q18. Bomb calorimeter is used to determine
(A) Higher calorific value at constant volume
(B) Lower calorific value at constant volume ,
(C) Higher calorific value at constant pressure
(D) Lower calorific value at constant pressure

Q19. Ultimate analysis of fuel is determination of percentage of
(A) carbon, hydrogen, nitrogen, sulphur, moisture
(B) fixed carbon, ash, volatile matter, moisture
(C) higher calorific value
(D) lower calorific value

Q20. For combustion of a fuel, following is essential
(A) correct fuel air ratio
(B) proper ignition temperature
(C) 02 to support combustion
(D) all the three above