Steam Boilers, Engines, Turbines Online Test - Set 09

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
    (C) I.P.
    (D) (I.P.

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