Practice Test: Question Set - 09
1. Which of the following substance will have same percentage in both proximate and ultimate analysis?
- (A) Ash
- (B) Volatile matter
- (C) Moisture
- (D) Hydrogen
2. The steam enters the nozzle at a
- (A) High
pressure and a low velocity
- (B) High
pressure and a high velocity
- (C) Low
pressure and a low velocity
- (D) Low
pressure and a high velocity
3. By compounding the expansion of steam in two or more cylinders, the length of stroke
- (A) Does
not change
- (B) Increases
- (C) Decreases
- (D) None
of these
4. The diameters of fire tubes and superheater tubes in locomotive boiler are
- (A) 47.5 mm, 130 mm
- (B) 32.5 mm, 180 mm
- (C) 65.5 mm, 210 mm
- (D) 24.5 mm, 65 mm
5. The effect of friction on the flow of steam through a nozzle is to
- (A) Decrease
the mass flow rate and to increase the wetness of steam
- (B) Increase
the mass flow rate and to increase the exit temperature
- (C) Decrease
the mass flow rate and to decrease the wetness of steam
- (D) Increase
the exit temperature without any effect on mass flow rate
6. Throttle governing of steam engines is a method of controlling the engine output by varying
- (A) Volume
of intake steam
- (B) Pressure
of intake steam
- (C) Temperature
of intake steam
- (D) All of these
7. With increase in load, convection superheater has
- (A) Drooping
characteristic
- (B) Linear characteristic
- (C) Rising characteristic
- (D) Flat characteristic
8. In order to reduce the rotor speed of an impulse turbine, the method employed is
- (A) Velocity
compounding
- (B) Pressure
compounding
- (C) Pressure-velocity
compounding
- (D) All of these
9. In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the atmospheric pressure.
- (A) Equal to
- (B) Lower than
- (C) Higher than
- (D) None of
these
10. 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
11. Which of the following statement is correct?
- (A) The
efficiency of steam turbines is greater than steam engines
- (B) A flywheel
is a must for steam turbine
- (C) The turbine
blades do not change the direction of steam issuing from the nozzle
- (D) The pressure
of steam, in reaction turbines, is increased in fixed blades as well as in
moving blades
12. By compounding the expansion of steam in two or more cylinders, the ratio of expansion
- (A) Does
not change
- (B) Increases
- (C) Decreases
- (D) None of
these
13. The proximate analysis of fuel lists
- (A) Various chemical constituents, carbon,
hydrogen, oxygen etc, plus ash as percents by volume
- (B) Various chemical constituents, carbon,
hydrogen, oxygen, etc, plus ash as percents by weight
- (C) Fuel constituents as
percents by volume of moisture, volatile, fixed carbon and ash
- (D) Fuel constituents as
percents by weight of moisture, volatile, fixed carbon and ash
14. A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as
- (A) Back
pressure turbine
- (B) Pass
out turbine
- (C) Low
pressure turbine
- (D) Impulse
turbine
15. Willian's law states that the steam consumption per hour provided with a throttled governor is proportional to (where I.P. = Indicated power)
- (A) 1/(I.P)
- (B) 1/(I.P)²
- (C) I.P.
- (D) (I.P.)²
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