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
Next Tests: