Steam Boilers, Engines, Nozzles and Turbines - Set 01

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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