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