Practice Test: Question Set - 12
1. On Millier chart, the constant pressure lines
- (A) Diverge from left to right
- (B) Diverge from right to
left
- (C) Are equally spaced
throughout
- (D) First rise up and
then fall
2. The reheat factor depends upon
- (A) Initial pressure
and superheat
- (B) Exit
pressure
- (C) Turbine
stage efficiency
- (D) All
of these
3. In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be
- (A) 56 %
- (B) 63 %
- (C) 74 %
- (D) 78 %
4. The state of vapor under saturation condition is described by
- (A) Pressure alone
- (B) Temperature alone
- (C) Pressure and temperature
- (D) Pressure and dryness
fraction
5. The diagram efficiency is the ratio of
- (A) Workdone
on the blades to the energy supplied to the blades
- (B) Workdone
on the blades per kg of steam to the total energy supplied per stage per kg of
steam
- (C) Energy
supplied to the blades per kg of steam to the total energy supplied per stage
per kg of steam
- (D) None of the
above
6. Locomotive boiler is a
- (A) Single
tube, horizontal, internally fired and stationary boiler
- (B) Single
tube, vertical, externally fired and stationary boiler
- (C) Multi-tubular,
horizontal, internally fired and mobile boiler
- (D) Multi-tubular,
horizontal, externally fired and stationary boiler
7. 100% efficiency of a thermal cycle cannot be achieved because of
- (A) Frictional losses
- (B) It is not possible to
achieve 0°K temperature
- (C) Leakage
- (D) Non availability of
ideal substance
8. In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,
- (A) Velocity
increases
- (B) Velocity
decreases
- (C) Velocity
remains constant
- (D) Pressure
remains constant
9. Cut-off governing as compared to throttle governing is
- (A) Less
efficient and less economical
- (B) Less
efficient and more economical
- (C) More
efficient and less economical
- (D) More
efficient and more economical
10. Which of the following coals has the highest calorific value?
- (A) Anthracite coal
- (B) Bituminous coal
- (C) Lignite
- (D) Peat
11. In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be
- (A) 160/3 m/s
- (B) 320/3 m/s
- (C) 640/3 m/s
- (D) 640 m/s
12. The main object of a boiler trial is
- (A) To
determine the generating capacity of the boiler
- (B) To
determine the thermal efficiency of the boiler when working at a definite
pressure
- (C) To prepare
heat balance sheet for the boiler
- (D) All of the
above
13. Hard coke is used in
- (A) Cement industry
- (B) Thermal power plant
- (C) Blast furnace
- (D) Domestic use
14. The velocity of whirl at outlet for an axial discharge turbine is
- (A) Minimum
- (B) Maximum
- (C) Zero
- (D) None of
these
15. The ratio of the volume at cut-off to the swept volume is called
- (A) Cut-off
ratio
- (B) Expansion
ratio
- (C) Clearance
ratio
- (D) None of
these
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