Practice Test: Question Set - 01
1. Steam turbines are used for
- (A) Large
marine propulsion
- (B) Electric
power generation
- (C) Direct
drive of fans, compressors, pumps
- (D) All
of these
2. Locomotive boiler is of the following type
- (A) Multi tubular
- (B) Horizontal
- (C) Internally fired
- (D) All of the above
3. The maximum heat loss is a boiler occurs due to
- (A) Moisture
in fuel
- (B) Dry
flue gases
- (C) Steam
formation
- (D) Unburnt
carbon
4. A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be
- (A) 79 m/s
- (B) 188 m/s
- (C) 450 m/s
- (D) 900 m/s
5. The actual vacuum in a condenser is equal to
- (A) Barometric
pressure + actual pressure
- (B) Barometric
pressure - actual pressure
- (C) Gauge
pressure + atmospheric pressure
- (D) Gauge
pressure - atmospheric pressure
6. It is required to produce large amount of steam at low pressure. Which boiler should be used?
- (A) Pulverized fuel fired
boiler
- (B) Cochran boiler
- (C) Lancashire boiler
- (D) Babcock and Wilcox
boiler
7. Reheating of steam in a turbine
- (A) Increases
the work-done through the turbine
- (B) Increases
the efficiency of the turbine
- (C) Reduces
wear on the blades
- (D) All
of these
8. The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as
- (A) Equivalent
evaporation
- (B) Factor
of evaporation
- (C) Boiler
efficiency
- (D) Power
of a boiler
9. In designing air preheaters, the important design consideration is that
- (A) Approach temperature
should be as low as possible
- (B) Handling and
maintenance should be easier
- (C) Heat transfer area
should be optimum
- (D) Stack gases should
not be cooled to the dew point
10. A steam nozzle converts
- (A) Heat
energy of steam into kinetic energy
- (B) Kinetic
energy into heat energy of steam
- (C) Heat
energy of steam into potential energy
- (D) Potential
energy into heat energy of steam
11. The number of water level indicators in a boiler are generally __________ in number.
- (A) One
- (B) Two
- (C) Three
- (D) Four
12. 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
13. The factor of evaporation for all boilers is always
- (A) Equal to
unity
- (B) Less than
unity
- (C) Greater than
unity
- (D) None
of these
14. Water and sediment in fuel oil can be removed by
- (A) Heating the oil in
the settling tanks
- (B) Cooling the oil in
the settling tanks
- (C) Burning the oil
- (D) Suspension
15. For a Parson's reaction turbine, if α₁ and α₂ are fixed blade angles at inlet and exit respectively and β₁ and β₂ are the moving blade angles at entrance and exit respectively, then
- (A) α₁ = α₂ and
β₁ = β₂
- (B) α₁ = β₁ and
α₂= β₂
- (C) α₁ < β₁ and
α₂ > β₂
- (D) α₁ = β₂ and
β₁ = α₂
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