# Practice Test: Question Set - 17

1. The temperature of flue gases at air heater outlet should be
(A) 100°C
(B) Above dew point temperature of flue gases
(C) Below dew point temperature of flue gases
(D) Less than wet bulb temperature of flue gases

2. The critical pressure ratio for initially wet steam is
(A) 0.546
(B) 0.577
(C) 0.582
(D) 0.601

3. The function of a cross-head is to guide motion of the _________ and to prevent it from bending.
(A) Piston rod
(B) Connecting rod
(C) Eccentric rod
(D) Valve rod

4. An economiser in a boiler
(A) Increases steam pressure
(B) Increases steam flow
(C) Decreases fuel consumption
(D) Decreases steam pressure

5. Multi-stage steam turbines are of the
(A) Velocity compounded type
(B) Reaction type
(C) Pressure compounded type
(D) All of these

6. A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly
(A) 1.05
(B) 2.86
(C) 6.65
(D) 10.05

7. Which is not correct statement about pulverized fuel firing?
(A) High burning rate is possible
(B) Heat release can be easily controlled
(C) Fuel burns economically
(D) It is the best technique for burning high ash content fuel having low fusion ash

8. The flow of steam is supersonic
(A) At the entrance to the nozzle
(B) At the throat of the nozzle
(C) In the convergent portion of the nozzle
(D) In the divergent portion of the nozzle

9. The diagram factor is the ratio of the
(A) Area of the actual indicator diagram to the area of theoretical indicator diagram
(B) Actual workdone per stroke to the theoretical workdone per stroke
(C) Actual mean effective pressure to the theoretical mean effective pressure
(D) Any one of the above

10. Relative percentage of heat absorbed through the heat transfer of
(i) Furnace water wall
(ii) Boiler tank
(iii) Superheater
(iv) Economizer
(v) Air-heater of a typical boiler of 200 MW capacity would be of the order of
(A) 48 : 20 : 15 : 7 : 10
(B) 10 : 7 : 15 : 20 : 48
(C) 20 : 48 : 7 : 15 : 10
(D) 7 : 15 : 20 : 10 : 48

11. The process of maintaining the speed of the turbine constant for various load conditions, is known as
(A) Bleeding
(B) Reheating
(C) Governing
(D) None of these

12. Expansion ratio is the ratio of
(A) Swept volume to the volume at cut-off
(B) Clearance volume to the swept volume
(C) Volume at cut-off to the swept volume
(D) Swept volume to the clearance volume

13. Superheating of steam is done at
(A) Constant volume
(B) Constant temperature
(C) Constant pressure
(D) Constant entropy

14. When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.
(A) Increases
(B) Decreases
(C) Remain same
(D) None of these

15. In a receiver type compound engine, the high pressure and low pressure cylinders
(A) Have common piston rod
(B) Are set at 90°
(C) Have separate piston rods
(D) Are set in V-arrangement

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