Steam Boilers MCQ Practice Tests - Set 04

Practice Test: Question Set - 04


1. The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.
    (A) More
    (B) Less
    (C) Same
    (D) None of these

2. A condenser in a steam power plant
    (A) Increases expansion ratio of steam
    (B) Reduces back pressure of steam
    (C) Reduces temperature of exhaust steam
    (D) All of these

3. An impulse turbine as compared to a reaction turbine, for a given power has _________ row of blades.
    (A) Equal
    (B) Less
    (C) More
    (D) None of these

4. For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be
    (A) One-half the height of chimney
    (B) Equal to the height of chimney
    (C) Two times the height of chimney
    (D) Four times the height of chimney

5. The steam temperature with increase in load in case of a boiler fitted with radiation superheater
    (A) Increases
    (B) Decreases
    (C) Remain unaffected
    (D) First increases and then decreases

6. The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.
    (A) Remains same
    (B) Decreases
    (C) Increases
    (D) None of these

7. The object of producing draught in a boiler is
    (A) To provide an adequate supply of air for the fuel combustion
    (B) To exhaust the gases of combustion from the combustion chamber
    (C) To discharge the gases of combustion to the atmosphere through the chimney
    (D) All of the above

8. Feed water conditioning in thermal power plants in done to
    (A) Reduce hardness and for removal of solids
    (B) Increase efficiency of thermal power plant
    (C) Increase heat transfer rate
    (D) Increase steam parameters

9. A regenerative steam cycle renders
    (A) Increased work output per unit mass of steam
    (B) Decreased work output per unit mass of steam
    (C) Increased thermal efficiency
    (D) Decreased work output per unit mass of steam as well as increased thermal efficiency

10. The fire tubes in a Cochran boiler are
    (A) Horizontal
    (B) Vertical
    (C) Inclined
    (D) None of these

11. For water, at pressures below atmospheric;
    (A) Melting point rises slightly and boiling point drops markedly
    (B) Melting point rises markedly and boiling point drops markedly
    (C) Melting point drops slightly and boiling point drops markedly
    (D) Melting point drops slightly and boiling point drops slightly

12. The action of steam in a steam turbine is
    (A) Static
    (B) Dynamic
    (C) Static and dynamic
    (D) Neither static nor dynamic

13. The efficiency of the plant __________ with the mechanical draught.
    (A) Increases
    (B) Decreases
    (C) Remains constant
    (D) None of these

14. The latent heat of steam with increase of pressure
    (A) Remain same
    (B) Increases
    (C) Decreases
    (D) Behaves unpredictably

15. When the cross-section of a nozzle increases continuously from entrance to exit, it is called a
    (A) Divergent nozzle
    (B) Convergent nozzle
    (C) Convergent-divergent nozzle
    (D) None of these

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