1. The path followed in a vapour power cycle is
A)
Boiler-Condenser-Turbine-Pump B) Boiler-Turbine-Condenser-Pump
C)
Boiler-Turbine-Pump-Condenser D)
Boiler-Pump-Turbine-Condenser
2. For a vapour power cycle,
A) Net Heat Input Is Converted Into Net Work Output
B)
Q1-Q2 = Wt -Wp
C) Efficiency = 1 – (Q2/Q1)
D)
All of the Mentioned
3. For a Rankine cycle, which of
the following is true?
A) A
Reversible Constant Pressure Heating Process Happens In Steam Boiler
B) Reversible
Adiabatic Expansion Of Steam In Turbine
C) Reversible
Constant Pressure Heat Rejection In Condenser
D) All of the Mentioned
4. The work ratio is defined as
the ratio of
A)
Positive Work Output to Net Work Output
B) Net Work Output to Positive Work Output
C) Heat
Input to Work Output
D) None
of the Mentioned
5. Heat rate is given by (in kJ/kWh)
A) Cycle Efficiency B)
3600 / Cycle Efficiency
C)
Cycle Efficiency / 3600 D)
Cycle Efficiency x 3600
6. Which of the following
statement is true?
A) During
Compression, Specific Volume of the Fluid Should Be Kept Small
B) During
Expansion, Specific Volume of the Fluid Should Be Kept Large
C)
Both of the Mentioned
D) None of the Mentioned
7. The liquid water handled by
pump is
A) Incompressible
B) With
Increase in Pressure, There Is A Little Change in Density or Specific Volume
C) Both of the Mentioned
D) None of the Mentioned
8. For a fluid undergoing cycle
process,
A) There
Is No Net Change in Its Internal Energy
B) Energy
Transfer As Heat Is Equal to the Energy Transfer as Work
C)
Both of the Mentioned
D) None of the Mentioned
9. Work output of turbine is ____
the work input to the pump.
A) Much Larger
B)
Much Smaller
|
C) Equal to |
D)
None of the Mentioned
10. The thermal efficiency of the
cycle is
A) Q2 / Wnet B) Wnet / Q2 C) Wnet / Q1 D) Q1 / Wnet
11. Which of the following losses
occur in a cycle?
|
A) Piping Losses |
|
B) Pump Losses |
|
C)
Turbine Losses 12. The important piping losses include |
|
D) All of the Mentioned |
|
A) Pressure Drop Due To Friction |
|
B) Heat Loss To Surroundings |
|
C) Both of the Mentioned 13. The losses in boiler include |
|
D) None of the Mentioned |
|
A) Pressure Drop from Pump to Boiler |
|
B) Pressure Drop in Boiler |
|
C) Both of the Mentioned 14. The main losses in turbine include |
|
D) None of the Mentioned |
|
A) Heat Loss to Surroundings |
|
B) Friction Losses |
|
C) Both of the Mentioned 15. The losses in
condenser are ____ |
|
D) None of the Mentioned |
|
A) Small |
|
B) Large |
|
C)
Always Constant 16. The condenser losses include |
|
D) None of the Mentioned |
|
A) Loss of Pressure |
|
B) Cooling
of Condensate Below Saturation Temperature |
|
C)
Both of the Mentioned |
|
D) None of the Mentioned |
17. The efficiency of Carnot
cycle is ____ the efficiency of Rankine cycle.
A) Less than B) Greater than C) Equal to D) None of the Mentioned
18. The only process which is
different in Carnot and Rankine cycle is
A)
Compression in Pump B)
Expansion In Turbine
C)
Heat Rejection Process D) Heat Addition Process
19. In the Rankine cycle, heat is
added reversibly at
A) Constant Pressure and Constant Temperature
B) Constant Pressure and Infinite Temperature
C) Infinite Pressure and Constant Temperature
D) Infinite Pressure and
Infinite Temperature
20. The efficiency of Rankine
cycle is given by
A) 1 – (Q1/Q2)
B) 1 – (Tmean/T2)
C) 1 – (T2/Tmean)
D)
None of the Mentioned
21. Which of the following
statement is true?
A) For
Given Tmean, Lower Is The T2, Higher Will Be The
Efficiency of Rankine Cycle
B) The
Lowest Possible Temperature of Heat Rejection Is The Surroundings Temperature
C) Higher Is The Mean Temperature of Heat Addition, Higher Will Be The Efficiency
D) All of the Mentioned
22. If we ____ the superheat at constant pressure
then the cycle efficiency ____
A)
Decrease, Increases B)
Increase, Decreases
C) Increase, Increases D)
Decrease, Decreases
23. To prevent erosion of blades,
quality should not fall below
A) 85% B) 90% C) 95% D) 100%
24. To fix the maximum steam
pressure at the inlet of turbine we need to first fix
A) The
Maximum Steam Temperature at Turbine Inlet
B) Minimum
Temperature of Heat Rejection
C) The
Minimum Quality of Steam at Turbine Exhaust
D) All of the Mentioned
25. Which of the following is
true about a reheat cycle?
A) Used
To Limit The Quality At Turbine Exhaust At 0.85 When Steam Pressure Is Higher
Than (P1)Max
B) After
Partial Expansion In Turbine, Steam Is Brought Back To Boiler
C) The
Steam Is Reheated By Combustion Gases
D) All of the Mentioned
26. The correct sequence of
expansion in a reheat cycle is
A) HP Turbine – LP Turbine – Constant Pressure In Boiler
B) HP
Turbine – Constant Pressure In Boiler – LP Turbine
C) LP
Turbine – Constant Pressure In Boiler – HP Turbine
D) LP
Turbine – HP Turbine – Constant Pressure In Boiler
27. Why is steam not allowed to
expand deep into two-phase region before being taken for reheating?
A) To
Protect the Reheater Tubes
B) To
Prevent Solid Deposits Being Left Behind While Evaporating
C)
Both of the Mentioned
D) None of the Mentioned
28. Why should the reheat
pressure be optimized?
A) A
Low Reheat Pressure Brings Down the Mean Temperature of Heat Addition and Hence
the Cycle Efficiency
B) A
High Reheat Pressure Increases the Moisture Content at Turbine Exhaust
C)
Both of the Mentioned
D) None of the Mentioned
29. The optimum reheat pressure
is ____ times that of the initial steam pressure.
A) 0.2
B) 0.23
C) 0.25
D) All of the Mentioned
30. With the use of reheat,
A) The
Net Work Output of The Plant Increases
B) There
Is Only a Marginal Increase in Cycle Efficiency
C) The
Quality of Steam at Turbine Exhaust Is Kept Within a Limit
D) All of the Mentioned
31. The mean temperature of heat
addition can be increased by
A) Increasing
the Amount of Heat Supplied at High Temperatures
B) Decreasing
the Amount of Heat Added At Low Temperatures
C)
Both of the Mentioned
D) None of the Mentioned
32. The efficiency of an ideal
regenerative cycle is given by
A)
1 – (T1/T2) B) 1 – (T2/T1)
C)
1 – (Q1/Q2) D)
None of the Mentioned
33. The efficiency of an ideal
regenerative cycle is ____ the Carnot cycle efficiency.
A)
Greater than B) Equal to
C)
Less than D)
None of the Mentioned
34. When compared with the
Rankine cycle, the ideal regenerative cycle has
A)
Less Net Work Output B)
More Steam Rate
C) More Efficient D)
All of the Mentioned
35. The ideal regenerative cycle is not practicable because
A) Reversible
Heat Transfer Can’t Be Obtained In Finite Time
B) Heat
Exchanger In Turbine Is Mechanically Impracticable
C) There
Is High Moisture Content of Steam In The Turbine
D) All of the Mentioned
36. The efficiency of
regenerative cycle will be ____ the efficiency of the Rankine cycle.
A)
Greater than B) Equal to
C)
Less than D)
None of the Mentioned
37. Which of the following is an
assumption for heaters?
A) They Are Adequately Insulated
B) There Is No Heat Gain From or Heat Loss to the Surroundings
C) Both of the Mentioned
D)
None of the Mentioned
38. The reheating of steam is
used when the vaporization pressure is ____.
A) Low B) High C) Both When Low or High D) Always
39. Why both reheating and
regeneration is used together?
A) The
Effect of Reheat Alone On Efficiency Is Very Small
B) Regeneration
Has a Marked Effect on Efficiency
C)
Both of the Mentioned
D) None of the Mentioned
40. How many types of feed water
heaters are present?
A) One B) Two C) Three D) Four
41. The temperature of feed water
leaving a heater is ____ the saturation temperature at steam extraction
pressure.
A)
Less than B) Equal to
C)
More than D)
None of the Mentioned
42. Which of the following
statement is true?
A) Open
Heater Is Also Known As Contact-Type Heater
B) In
An Open Type Heater The Extracted Or Bled Steam Is Allowed To Mix With The Feed
water
C) In A Closed Heater, The Fluids Are Not Allowed To Mix Together
D) All of the Mentioned
43. Which of the following is
true for an open heater?
A)
It Is Simple, Has Low Cost and Low Heat Transfer Capacity
B) A Pump Is Required At Each Heater
C) Both
of the Mentioned
D) None
of the Mentioned
44. Which of the following is
true for a closed heater?
A) It
Requires a Single Pump Regardless of the Number of Heaters
B) It
Is Costly
C)
Both of the Mentioned
D) None of the Mentioned
45. The higher the number of
heaters used, the ____ will be the cycle efficiency.
A) Lower
B)
Higher
C) Efficiency Does Not Depend On Number of Heaters
D) None of the Mentioned
46. The thermal irreversibility
should be ____ to improve the performance.
A) Reduced B)
Increased
C)
Kept Constant D)
None of the Mentioned
47. The working fluid should have
____ critical temperature.
A) Low
B)
High
C)
It Does Not Matter D)
None of the Mentioned
48. The saturation pressure at
heat rejection temperature should be ____ atmospheric pressure.
A)
Equal To B)
Below
C) Above D)
None of the Mentioned
49. Why is superheat desired?
A)
To Reduce Piping Losses B)
To Improve Efficiency
C) Both of the Mentioned D)
None of the Mentioned
50. Which of the following fluid
can be used in place of water?
A)
Diphenyl Ether B)
Aluminum Bromide
C) Mercury D)
All of the Mentioned
51. Which of the following
statement is true?
A) Only
Mercury Has Been Used In Place Of Water
B) Diphenyl
Ether Decomposes At High Temperatures
C)
Both of the Mentioned
D) None of the Mentioned
52. Why is mercury unsuitable at
low temperatures?
A) Its
Saturation Pressure Becomes Very High
B) Its
Specific Volume Is Very Low At Such a High Pressure
C) Both
of the Mentioned
D) None of the Mentioned
53. In a binary cycle, ____
cycles with ____ working fluid are coupled.
A) Two, Same B)
Two, Different
C)
Three, Same D)
Three, Different
54. When mercury cycle is added
to the steam cycle,
A) The
Mean Temperature Of Heat Addition Increases
B) Efficiency
Decreases
C) Maximum
Pressure Is High
D) All
of the Mentioned
55. In a mercury-steam cycle,
mercury cycle is called ____ and steam cycle is called ____
A) Bottoming Cycle, Topping Cycle
B) Topping Cycle, Bottoming Cycle
C) Both Are Called Bottoming Cycle
D)
Both Are Called Topping Cycle
56. Rankine cycle efficiency of a
good Steam Power Plant may be in the range of?
A) 15 To 20%
B) 35 To 45%
C) 70 To 80%
D)
90 To 95%
57. Which of these is sometimes
neglected?
A) Turbine Work
B) Pump Work
C) Condenser Heat
D)
Boiler Heat
58. Efficiency of a Rankine Cycle is also
expressed as__________
A) Capacity Ratio
B) Heat Rate
C) Heat Ratio
D)
Steam Rate
59. Steam Power Plants are more
popular in electric power generation because
A) Work Output Of Turbine Is Very Large Than
Work Input To The Pump
B) Work
Output Of Turbine Is Very Small Than Work Input To The Pump
C) Work
Output Of Turbine Is Equal To Work Input To The Pump
D) None
of the Mentioned.
60. In Rankine Cycle, water is
converted to saturated liquid in ___________
A) Evaporator
B) Economizer
C) Superheater
D)
Preheater
Composed
By:
R.Satheesh, M.E., Asso.Prof.,
************
