PIPE ELEMENTS

1. Is the most common dryer used which consist of rotating cylinder inside which the materials flow while getting in contact with hot gas?

a. Tower dryer

b. Centrifugal dryer

c. Trey dryer

d. Rotary dryer

d. Rotary dryer

2. Is the ratio of the mass of water-vapor in air and the mass of air if it is saturated is called:

a. Humidity ratio

b. Mass ratio

c. Vapor ratio

d. Relative humidity

d. Relative humidity

3. The output power available and delivered to the switchboard is:

a. brake power

b. combined power

c. indicated power

d. net power

b. combined power

4. Which of the following is NOT a type of water cooled condenser in refrigeration?

a. double pipe

b. double shell

c. shell and coil

d. shell and tube

b. double shell

5. Component of absorption refrigeration system in which the solution is cooled by cooling water:

a. rectifier

b. generator

c. evaporator

d. absorber

d. absorber

6. Cascade refrigeration cycle is often used in industrial process where objects must be cooled to temperature below:

a. -46°C

b. -56°C

c. -66°C

d. -76°C

a. -46°C

7. Type of refrigerant control designed to maintain a pressure difference while the compressor is operating:

a. Thermostatic expansion valve

b. Capillary tube

c. Automatic expansion valve

d. none of the above

b. Capillary tube

8. Modern way of detecting air compressor leak is by using:

a. Soap and water

b. Air leak detector

c. Acoustic leak detector

d. Ammonia leak detector

c. Acoustic leak detector

9. For foundation of stacks, the maximum pressure on the soil is equal to the pressure due to the weight and the ___________.

a. soil movement

b. wind movement

c. ground movement

d. engine movement

b. wind movement

10. For multi stage compression of an ideal Brayton cycle, the back ratio will

a. increase

b. decrease

c. remain the same

d. none of these

b. decrease

11. Type of turbine that has a specific speed below 5:

a. impulse turbine

b. propeller turbine

c. francis turbine

d. deriaz turbine

a. impulse turbine

12. A high discharge type of turbine:

a. impulse turbine

b. propeller turbine

c. francis turbine

d. deriaz turbine

c. francis turbine

13. Use to minimize the speed rise due to a sudden load rejection:

a. needle valve

b. wicket gate shut-off

c. shut-off valve

d. jet deflector

d. jet deflector

14. Is the speed of a turbine when the head on the turbine is one meter?

a. specific speed

b. rated speed

c. utilized speed

d. unit speed

d. unit speed

15. Is a fluid property which refers to the intermolecular attraction by which the separate particles of the fluid are held together?

a. cohesion

b. adhesion

c. surface tension

d. hypertension

a. cohesion

16. Which of the following is NOT the cause of black smoke in diesel engine?

a. fuel valve open too long

b. high compression pressure

c. carbon in exhaust pipe

d. overload engine

b. high compression pressure

17. Which of the following is not a method of starting a diesel engine?

a. manual cranking

b. electric(battery)

c. compressed air

d. using another generator

d. using another generator

18. Two-stroke engine performs ________ to complete one cycle.

a. suction and discharge stroke

b. compression and power stroke

c. power and exhaust stroke

d. suction and exhaust stroke

b. compression and power stroke

19. A type of geothermal plant used when there is a presence of brine extracted from underground:

a. dry geothermal

b. double-flash geothermal

c. single flash

d. binary geothermal

d. binary geothermal

20. Is the most important safety device on the power boiler?

a. check valve

b. gate valve

c. safety valve

d. globe valve

c. safety valve

21. Is a reaction during which chemical energy is released in the form of heat?

a. cosmic reaction

b. ethnic reaction

c. endothermic reaction

d. exothermic reaction

d. exothermic reaction

22. By reheating the steam in an ideal Ranking cycle the heat rejected will,

a. increase

b. decrease

c. remain the same

d. none of these

a. increase

23. By increasing the boiler pressure in Rankine cycle the moisture content at boiler exit will,

a. increase

b. decrease

c. the same

d. none of these

a. increase

24. Presently the highest steam temperature allowed at the turbine inlet is about ______.

a. 340°C

b. 520°C

c. 620°C

d. 1020°C

c. 620°C

25. In brayton cycle, the heat is transformed during what process?

a. Isothermal

b. Isentropic

c. Isobaric

d. Isochoric

c. Isobaric

26. The fuel injection process in diesel engine starts when the piston is at ______

a. TDC

b. leaving TDC

c. BDC

d. half of the stroke

a. TDC

27. If the cut-off ratio of diesel cycle increases, the cycle efficiency will

a. decrease

b. increase

c. remains the same

d. none of these

a. decrease

28. If Joule Thomson coefficient is equal to zero, then the process will become

a. Isentropic

b. Isenthalpic

c. Isobaric

d. Isothermal

d. Isothermal

29. If the fluid passed through a nozzle, its entropy will:

a. increase

b. decrease

c. remains the same

d. none of these

c. remains the same

30. Refrigerant number R-744 is

a. butane

b. carbon monoxide

c. propane

d. carbon dioxide

d. carbon dioxide

31. Refrigerant number R-1150 is

a. propylene

b. ethane

c. methane

d. butane

b. ethane

32. Refrigerant R-40 is

a. chlorodifluoromethane

b. difluoromenthane

c. ammonia

d. chloromethane

d. chloromethane

33. A coil in series with evaporator that is use to prevent the liquid refrigerant entering the compressor

a. accumulator

b. liquid superheater

c. drier loop

d. liquid suction heat exchanger

c. drier loop

34. A type of valve connected from discharge of compressor directly to suction that is normally closed and will open automatically only if there is high discharge pressure

a. check valve

b. solenoid valve

c. king valve

d. relief valve

b. solenoid valve

35. Use to increase the capacity of condenser

a. water regulating valve

b. de-superheating coils

c. liquid-suction heat exchanger

d. condenser heating coils

b. de-superheating coils

36. Is use to subcooled the refrigerant from the condenser

a. liquid line

b. condenser sub-cooler

c. de-superheating colis

d. liquid receiver

a. liquid line

37. By subcooling the refrigerant in refrigeration system, the compressor power per unit mass will

a. increase

b. decrease

c. remain the same

d. none of these

c. remain the same

38. Superheating the refrigerant in refrigeration system, the specific volume at compressor suction will

a. increase

b. decrease

c. remain the same

d. none of these

c. remain the same

39. A type of refrigerant control typically used in household refrigeration

a. thermostatic expansion valve

b. capillary tube

c. automatic expansion valve

d. high side float

b. capillary tube

40. Type of condenser that operates like a cooling water

a. air cooled condenser

b. evaporative condenser

c. shell and tube condenser

d. water cooled condenser

b. evaporative condenser

41. The major problem of heat pump is

a. refrigerant

b. outside air

c. supply air

d. frosting

d. frosting

42. Cascade refrigerant system are connected in

a. series

b. parallel

c. series-parallel

d. none of these

a. series

43. Is use to heat up the solution partially before entering the generator in absorption refrigeration system

a. rectifier

b. absorber

c. regenerator

d. pump

c. regenerator

44. The COP of actual absorption refrigeration system is usually

a. less than 1

b. less than 2

c. less than 3

d. less than 4

a. less than 1

45. Sight glass is often located at

a. discharge line

b. liquid line

c. between condenser and liquid receiver

d. suction line

b. liquid line

46. Convert fossil fuels into the shaft work

a. nuclear plant

b. gas turbine plant

c. dendro power plant

d. thermal plant

d. thermal plant

47. In a closed feed water heater, the feed water pass through

a. inside the tube

b. outside the tube

c. inside the shell

d. outside the shell

a. inside the tube

48. Use if extracted steam upon condensation gets subcooled,

a. trap

b. deaerator

c. filter

d. drain cooler

d. drain cooler

49. Needs only single pump regardless of number of heaters

a. open heater

b. closed heater

c. cross heater

d. regenerative heater

b. closed heater

50. Is also known as deaerator

a. open heater

b. closed heater

c. reheat heater

d. regenerative heater

a. open heater

51. A cycle typically used in paper mills, textile mills, chemical factories, sugar factories and rice mills

a. cogeneration cycle

b. combined cycle

c. by-product cycle

d. cascading cycle

a. cogeneration cycle

52. Which of the following is used for binary cycle power generation for high temperature application?

a. mercury

b. sodium

c. potassium

d. all of these

d. all of these

53. Which of the following is lowest grade of coal?

a. peat

b. lignite

c. sub-bituminous

d. bituminous

b. lignite

54. Which of the following helps in the ignition of coal?

a. moisture

b. ash

c. fixed carbon

d. volatile matter

d. volatile matter

55. A suspension of a finely divide fluid:

a. filtration

b. floatation

c. emulsion

d. separation

c. emulsion

56. Is an organic matter produced by plants in both land and water?

a. bio-ethanol

b. biomas

c. petroleum

d. biogradable

b. biomas

57. Known as drum less boiler.

a. once-through boiler

b. force circulation boiler

c. fire tube boiler

d. la mont boiler

a. once-through boiler

58. Reduces the steam temperature by spraying low temperature water from boiler drum

a. reheater

b. preheater

c. de-superheater

d. superheater

c. de-superheater

59. Carbon dioxide can be removed by:

a. deaeration

b. aeration

c. evaporation

d. vaporization

b. aeration

60. Presence of excess hydrogen ions makes the water

a. acidic

b. alkalinity

c. basic

d. hydroxicity

a. acidic

61. PH of water varies with

a. temperature

b. pressure

c. density

d. volume

a. temperature

62. Ph value of ______ is usually maintained for boiler water to minimized corrosion.

a. 8.5

b. 9.5

c. 10.5

d. 11.5

c. 10.5

63. On dynamic similitude, the relation which represents the ratio of inertia force to pressure force is:

a. Froude number

b. Cauchy number

c. Euler number

d. Reynolds number

c. Euler number

64. What is the maximum velocity in a sewer flowing full?

a. 600 lit/s

b. 900 lit/s

c. 1,200 lit/s

d. 1,800 lit/s

a. 600 lit/s

65. Select the one that is a positive indication of pollution of a river.

a. acidity

b. oxygen content

c. chloride content

d. nitrite content

c. chloride content

66. Show the variation of river flow (discharge) with time

a. hydrograph

b. hyctograph

c. mass curve

d. flow curve

a. hydrograph

67. Produces extreme pressure differentials and violent gas vibration.

a. vibration

b. detonation

c. explosion

d. knocking

b. detonation

68. In a spark ignition engine, detonation occurs near the ________.

a. end of combustion

b. middle of combustion

c. beginning of combustion

d. beginning of exhaust

a. end of combustion

69. In a compression ignition engine, the detonation occurs near the .

a. beginning of combustion

b. beginning of exhaust

c. middle of combustion

d. end of combustion

a. beginning of combustion

70. Morse test is used to measure the _______ of multi-cylinder engine.

a. brake power

b. indicated power

c. friction power

d. motor power

b. indicated power

71. At any point in fluid at rest, the pressure is the same in all directions. This principle is known as:

a. Pascal law

b. Bernoulli principle

c. Archimedes principle

d. Torricelli law

a. Pascal law

72. Air motion also plays important role in

a. human comfort

b. cooling

c. surroundings

d. none of these

a. human comfort

73. During simple heating and cooling process has a ____ humidity ratio

a. increasing

b. decreasing

c. constant

d. none of these

c. constant

74. The _____ follows a line of constant wet-bulb temperature on the psychrometric chart.

a. evaporative cooling process

b. condensive cooling process

c. direct cooling

d. none of these

a. evaporative cooling process

75. A vapor which is not about to condense is called a

a. mixture

b. critical vapor

c. superheated vapor

d. sub-cooled

c. superheated vapor

76. Robert Boyle observed during his experiments with a vacuum chamber that the pressure of gases is inversely proportional to their

a. volume

b. pressure

c. temperature

d. entropy

a. volume

77. Is a process during which the system remains in equilibrium at all times

a. quasi-equilibrium

b. static-equilibrium

c. dynamic-equilibrium

d. none of these

a. quasi-equilibrium

78. In the absence of any work interactions between a system and its surroundings, the amount of net heat transfer is equal to

a. the change of total energy of a closed system

b. the heat and work

c. the energy interaction

d. none of these

a. the change of total energy of a closed system

79. The constant volume and constant pressure specific heats are identical for

a. incompressible substance

b. compressible substance

c. compressible gas

d. none of these

a. incompressible substance

80. The velocity of fluid is zero at wall and maximum at the center because of the

a. viscous effect

b. velocity effect

c. temperature effect

d. none of these

a. viscous effect

81. Which of the following is the chemical formula of ethanol?

a. C2H6O

b. C7H16

c. C7H8

d. C6H12

a. C2H6O

82. Which of the following is the chemical formula of heptane?

a. C7H16

b. C2H16

c. C2H6O

d. C6H12

a. C7H16

83. Which of the following is the chemical formula of hexane?

a. C2H6O

b. C7H16

c. C7H8

d. C6H12

d. C6H12

84. Which of the following is the chemical formula of toluene?

a. C2H6O

b. C7H16

c. C7H8

d. C6H12

c. C7H8

85. By increasing the temperature source of Carnot cycle, which of the following will not be affected?

a. efficiency

b. work

c. heat added

d. heat rejected

d. heat rejected

86. When Rankine cycle is modified with regeneration, which of the following will increase?

a. turbine work

b. heat added

c. heat rejected

d. cycle efficiency

d. cycle efficiency

87. A device that violates the second law of thermodynamics is called

a. perpetual motion of second kind

b. perpetual motion of third kind

c. perpetual motion of first kind

d. none of these

b. perpetual motion of third kind

88. A _____ is used in aircraft engines and some automotive engine. In this method, a turbine driven by the exhaust gases is used to provide power to compressor or blower at the inlet.

a. discharging

b. turbocharging

c. supercharging

d. scavenging

b. turbocharging

89. The only device where the changes in kinetic energy are significant are the

a. compressor

b. pump

c. nozzles and diffusers

d. none of these

c. nozzles and diffusers

90. If the cutoff ratio decreases, the efficiency of diesel cycle

a. increases

b. decreases

c. remains constant

d. none of these

a. increases

91. In Brayton cycle, the ____ during constant pressure process.

a. work is added

b. heat is transferred

c. pressure is rejected

d. energy is added

b. heat is transferred

92. The use of regenerator is recommended only when the turbine exhaust temperature is higher than the compressor

a. exit temperature

b. inlet temperature

c. mean temperature

d. absolute temperature

a. exit temperature

93. Which of the following is/are the application of Brayton cycle

A. Propulsion system

B. Automotive Turbine Engines

C. Aircraft Turbine engines

D. all of these

D. all of these

94. The superheat vapor enters the turbine and expands isentropically and produces work by the rotating shaft. The _________ may drop, during the process.

A. density

B. Viscosity of fuel

C. Temperature and pressure

D. none of these

C. Temperature and pressure

95. Is an obvious reason for incomplete combustion?

A. insufficient carbon

B. insufficient air

C. insufficient nitrogen

D. insufficient oxygen

D. insufficient oxygen

96. Higher heating value when H20 in the product of combustion is in

A. solid form

B. vapor form

C. gas form

D. liquid form

D. liquid form

97. Device which transfer heat from low temperature medium to a higher temperature one is a

A. adiabatic

B. refrigerator

C. heat exchanger

D. heat pump

D. heat pump

98. This type of heat exchanger allows fluids to flow at right angles to each other

A. Series flow

B. Parallel flow

C. Cross flow

D. Counter flow

C. Cross flow

99. The fact the total energy in any one energy system remains constant is called the principle of

A. Conservation of Energy

B. Second Law of Thermodynamics

C. Conservation of Mass

D. Zeroth Law of Thermodynamics

A. Conservation of Energy

100. A process for which the inlet and outlet enthalpies are the same

A. isenthalpic

B. enthalpy conservation

c. throttling

d. steady state

c. throttling