Practice Test: Question Set - 03
1. In a reaction turbine, when steam flows through the fixed blades,
- (A) Pressure
increases while velocity decreases
- (B) Pressure
decreases while velocity increases
- (C) Pressure
and velocity both decreases
- (D) Pressure
and velocity both increases
2. The relative efficiency is defined as the
- (A) Ratio
of thermal efficiency to Rankine efficiency
- (B) Ratio
of brake power to the indicated power
- (C) Ratio
of heat equivalent to indicated power to the energy supplied in steam
- (D) Product
of thermal efficiency and Rankine efficiency
3. Which of the following is a fire tube boiler?
- (A) Locomotive boiler
- (B) Babcock and Wilcox
boiler
- (C) Stirling boiler
- (D) All of the above
4. The purpose of governing in steam turbines is to
- (A) Maintain
the speed of the turbine
- (B) Reduce
the effective heat drop
- (C) Reheat
the steam and improve its quality
- (D) Completely
balance against end thrust
5. The performance of a boiler is measured by the
- (A) Amount
of water evaporated per hour
- (B) Steam
produced in kg/h
- (C) Steam
produced in kg/kg of fuel burnt
- (D) All of these
6. Which of the following boilers is best suited to meet fluctuating demands?
- (A) Babcock and Wilcox
- (B) Locomotive
- (C) Lancashire
- (D) Cochran
7. The ratio of the work-done on the blades per kg of steam to the total energy supplied per stage per kg of steam is called
- (A) Blading
efficiency
- (B) Nozzle
efficiency
- (C) Stage
efficiency
- (D) Mechanical
efficiency
8. The artificial draught is produced by
- (A) Steam jet
- (B) Centrifugal
fan
- (C) Chimney
- (D) Both (A) and
(B)
9. With increase in load, radiant superheater has
- (A) Drooping
characteristic
- (B) Linear characteristic
- (C) Rising characteristic
- (D) Flat characteristic
10. In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be
- (A) 260 kW
- (B) 282 kW
- (C) 296 kW
- (D) 302 kW
11. Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler?
- (A) Cornish
boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler
- (B) Cornish
boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler
- (C) Cornish
boiler has one flue tube whereas Lancashire boiler has two flue tubes
- (D) Cornish
boiler has two flue tubes whereas Lancashire boiler has one flue tube
12. Primary air is the air used to
- (A) Provide air around
burners for obtaining optimum combustion
- (B) Transport and dry the
coal
- (C) Convert CO (formed in lower zone of
furnace) into CO₂ at higher zone
- (D) Air delivered by
forced draft fan
13. In an ideal impulse turbine, the
- (A) Absolute
velocity at the inlet of moving blade is equal to that at the outlet
- (B) Relative
velocity at the inlet of the moving blade is equal to that at the outlet
- (C) Axial velocity
at inlet is equal to that at the outlet
- (D) Whirl
velocity at inlet is equal to that at the outlet
14. A throttle governed steam engine develops 15 kW with 280 kg per hour of steam and 35 kW with 520 kg per hour of steam. The steam consumption in kg per hour when developing 20 kW will be nearly
- (A) 150 kg/h
- (B) 210 kg/h
- (C) 280 kg/h
- (D) 340 kg/h
15. Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of
- (A) Higher effectiveness of boiler
- (B) High calorific value coal being burnt
- (C) Fouling of heat
transfer surfaces
- (D) Raising of steam
temperature
Next Tests: