Mechanical Engineering MCQs [Quiz 28]

Q1. 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
(e) all of the above.

Q2. Steam exhaust from high pressure turbine is reheated in
(a) boiler drum
(b) superheater tubes
(c) economiser
(d) a separate coil
(e) a separate coil located in convection path.

Q3. 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
(e) none of the above.

Q4. Expanding steam to a very low prseeure (high vacuum) in steam engines is
(a) desirable
(b) economical
(c) essential
(d) optional
(e) uneconomical.

Q5. In locomotives, the draught is produced by
(a) chimney
(b) induced draft fan
(c) both combined (a) and (b)
(d) steam jet draught
(e) none of the above.

Q6. Reheating of steam under ideal conditions takes place at constant
(a) entropy
(b) enthaply
(c) pressure
(d) temperature
(e) all of the above.

Q7. 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
(e) more than the tallest building nearby.

Q8. 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
(e) rough analysis.

Q9. Which device is used in thermal power plants to reduce level of pollution
(a) induced draft fan
(b) smoke meter
(c) chimney
(d) precipitator
(e) pulveriser.

Q10. 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
(e) None of the above.

Updated: 28th July 2019 — 1:51 PM

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