MCQ on Thermal Power Plant Engineering - Set 08 - ObjectiveBooks
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MCQ on Thermal Power Plant Engineering - Set 08

Practice Test: Question Set - 08

1. The pressure at the furnace is minimum in case of
    (A) Forced draught system
    (B) Induced draught system
    (C) Balanced draught system
    (D) Natural draught system

2. The modern steam turbines are
    (A) Impulse turbines
    (B) Reaction turbines
    (C) Impulse-reaction turbines
    (D) None of the above

3. Carnot cycle comprises of
    (A) Two isentropic processes and two constant volume processes
    (B) Two isentropic processes and two constant pressure processes
    (C) Two isothermal processes and three constant pressure processes
    (D) None of the above

4. The percentage O2 by volume in atmosphere air is
    (A) 21 %
    (B) 23 %
    (C) 77 %
    (D) 79 %

5. In a boiler installation the natural draught is produced
    (A) Due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in
    (B) Due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column
    (C) Due to the fact that at the chimney top the pressure is more than its environmental pressure
    (D) All of the above

6. The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is
    (A) 0.6
    (B) 0.578
    (C) 0.555
    (D) 0.5457

7. The cooling section in the surface condenser
    (A) Increases the quantity of vapor extracted along with air
    (B) Reduces the quantity of vapor extracted along with air
    (C) Does not affect vapor quantity extracted but reduces pump capacity of air extraction pump
    (D) None of the above

8. Economisers improve boiler efficiency by
    (A) 1 to 5 %
    (B) 4 to 10 %
    (C) 10 to 12 %
    (D) None of these

9. Travelling grate stoker can burn coals at the rates of
    (A) 50-75 kg/m per hour
    (B) 75-100 kg/m per hour
    (C) 100-150 kg/m per hour
    (D) 150-200 kg/m2 per hour

10. Parson's turbine is
    (A) Pressure compounded steam turbine
    (B) Simple single wheel, impulse steam turbine
    (C) Simple single wheel reaction steam turbine
    (D) Multi wheel reaction steam turbine

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