Steam Boilers, Engines, Nozzles and Turbines Practice Test - Set 03

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

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