Free Printable PIPE NAMING M.E TO

1.

· A type of condenser combines the functions of condenser and cooling tower is called

a)

evaporative condenser

b)

air-cooled condenser

c)

water-cooled condenser

d)

Hermetic condenser

2.

· An expansion valve with fluid charge remote valve that maintains a constant degree of superheat in the evaporator is called

a)

Thermostatic expansion valve

b)

suction valve

c)

solenoid valve

d)

float valve

3.

· A refrigeration system ideally suited for use in air craft because it is light in weight and requires less space is called

a)

Air Refrigeration Cycle

b)

rankine cycle

c)

Air Cycle

d)

Vapor Compression Cycle

4.

· Refrigerant with chemical formula CHClF₂ is designated by

a)

r-22

b)

r-744

c)

r-134A

d)

r-12

5.

· Refrigerant with chemical formula CF₃CH₂F is designated by

a)

r-22

b)

R-12

c)

r-134A

d)

R-744

6.

· Carbon Dioxide refrigerant is designated by

a)

R-744

b)

R-12

c)

R134A

d)

R-22

7.

· Piping,fittings and valve materials found suitable for use in Ammonia refrigerant are manufactured from

(a)

8.

· In Vapor Absorption Refrigerant system utilizing ammonia as refrigerant and the absorbent is

(a)

9.

· The most common secondary refrigerant medium used in indirect refrigeration system such as in industrial ice plants and cold storages

(a)

10.

· A constant restriction expansion device in refrigeration system which is a long tube with narrow bore is called

(a)

11.

· Mixtures of refrigerants that which behave like pure substance are called

a)

azeotropes

b)

isomers

12.

· In refrigeration compression that has an electric motor and the compressor built into an integral housing is commonly called

(a)

13.

· Compounds with the same chemical formula but different molecular structure such R-134A and R-134 are called

a)

azeotropes

b)

isomers

14.

· An expansion valve used for flooded type of evaporator in a refrigeration system is called

a)

THERMOSTATIC EXPANSION VALVE

b)

SUCTION VALVE

c)

SOLENOID VALVE

d)

FLOAT VALVE

15.

· An atom in the refrigerant molecule consider responsible for the depletion of ozone layer in upper atmosphere (stratosphere)

(a)

16.

· A vapor compression system used for production of low temperature in which a series of refrigerant with compressively low boiling point are used in series of single stage units is called

(a)

17.

· Freezing method utilizes the combined effect of low temperature and high air velocity to produce a high rate of heat transfer from products

(a)

18.

· A component installed a refrigeration system to ensure that no liquid enters the compressor and subcooled the liquid from condenser to prevent bubbles of vapor from impending a flow of refrigerant through expansion valve is called

a)

Liquid to Suction Heat compressor

b)

Liquid to Suction Heat condenser

c)

Liquid to Suction Heat Exchanger

19.

· Refrigerant used in steam jet refrigeration is

a)

WATER

b)

BRINE

c)

R-23

d)

R-30

20.

· Which refrigerant is completely miscible with oil

a)

R-744

b)

R-12

c)

R134A

d)

R-22

21.

· Ammonia is not used in domestic refrigeration and comfort air conditioning because

(a)

22.

· Refrigerant-22 which is an HCFC has 1/20^th the ozone depletion potential (ODP) of R-11 and R-12, hence it can be continue to be use for quite sometime however all these have global warming potential (GWP) because of this R-22 will have to be phase out by year

(a)

23.

· Shut-off valve that is actuated by an electro-magnetic coil is called

a)

SOLENOID VALVE

b)

SHUTOFF VALVE

c)

THERMOSTATIC EXPANSION VALVE

d)

FLOAT VALVE

24.

· A very important consequence of ideal gas model is that the internal energy of an ideal gas is a function of ____ only

a)

TEMPERATURE

b)

TEMPERATURE DIFFERENCE

c)

VOLUME

d)

PRESSURE

25.

· At what temperature do the Fahrenheit and Celsius scales have the same value

(a)

26.

· States that if the temperature of a given quantity of gas is held constant, the volume of the given gas varies inversely with absolute pressure during the change of state

(a)

27.

· A unit of force that produces unit acceleration in ft/sec² and in a unit of mass in lbm.

(a)

28.

· Why does a cube of ice float in water?

a)

lesser that water

b)

greater that water

29.

· The work done in fusion a fluid across a boundary usually into or out of the system is called

(a)

30.

· States that energy is neither created nor destroyed but it can only change in forms

(a)

31.

· Heat is defined as form of energy that is transferred between two system by the virtue of _____

a)

TEMPERATURE ONLY

b)

TEMPERATURE DIFFERENCE

c)

PRESSURE

d)

VOLUME

32.

· The usual energy transferred in BTU/hr provided by input of power in Watts, this is just the coefficient of performance expressed in mixed units

a)

ENERGY EFFICIENCY RATIO

b)

TURNDOWN RATIO

c)

CLEANLINESS FACTOR

d)

PRESSURE RATIO

33.

· If EER is the energy coefficient ratio the COP is the coefficient of performance then EER =

a)

3.41 COP

b)

3.8 COP

c)

3.21 COP

d)

3.16 COP

34.

· the reverse rankine vapor cycle

a)

AIR CYCLE

b)

AIR REFRIGERATION CYCLE

c)

VAPOR COMPRESSION CYCLE

d)

BRAYTON CYCLE

35.

· The most common type of refrigeration application in household refrigerators, air conditioning for cars and houses, chillers and so on

a)

VAPOR COMPRESSION CYCLE

b)

AIR REFRIGERATION CYCLE

c)

AIR CYCLE

d)

RANKINE CYCLE

36.

reversed Brayton Cycle

a)

RANKINE CYCLE

b)

AIR CYCLE

c)

VAPOR COMPRESSION CYCLE

d)

AIR REFRIGERATION CYCLE

37.

· cycle that is bulky and involves toxic fluids hence it is unsuitable for home and autopulling

a)

ABSORPTION CYCLE

b)

AIR REFRIGERATION CYCLE

c)

VAPOR COMPRESSION CYCLE

d)

AIR CYCLE

38.

· cycle that is practically when large quantity of waste or expensive heat energy area available

a)

HEAT-DRIVEN REFRIGERATING CYCLE

b)

absorption cycle

c)

AIR CYCLE

d)

VAPOR COMPRESSION CYCLE

39.

· A product of computer aided manufacturing and precision machining where introduce commercially in the late 1980’s as replacement for reciprocating compressors in small residential air conditionings

(a)

40.

· Condenser used in small and medium size up to approximately 100 tons of refrigerators

a)

EVAPORATIVE CONDENSER

b)

AIR-COOLED CONDENSER

c)

water-cooled condenser

d)

HERMETIC CONDENSER

41.

· For efficient operation the condensing temperature should not be lower than

a)

5

b)

17

c)

3.8

d)

165

42.

· For efficient operation the condensing temperature should not be more than

a)

15

b)

5

c)

17

d)

3.8

43.

· Condenser used for larger capacity refrigerators

a)

AIR-COOLED CONDENSER

b)

WATER-COOLED CONDENSER

c)

hermetic condenser

d)

EVAPORATIVE CONDENSER

44.

· Coolers and chillers for water generally operates with an average temperature difference of

a)

3 to 11

b)

5 to 17

c)

3 to 8

d)

7 to 11

45.

· To avoid freezing problems, entering refrigerant should be

a)

ABOVE -2

b)

below -2

c)

ABOVE -3

d)

BELOW -3.8

46.

· Suction line should not be filled to large as reasonable velocity which needed to carry oil from the evaporator back to the compressor for horizontal suction lines the recommended minimum velocity is

a)

3.8

b)

3.11

c)

5.22;

d)

3.7

47.

· Type of turbine used for low heads, high rotational speed and larger flow rate

a)

AXIAL FLOW TURBINE

b)

KAPLAN TURBINE

c)

IMPULSE TURBINE

d)

reaction turbine

48.

· Which of the following turbines are centrifugal pumps operating on reverse

a)

REACTION TURBINE

b)

AXIAL FLOW TURBINE

c)

impulse turbine

d)

KAPLAN TURBINE

49.

· Also known as Francis Turbine or Radial Flow Turbine

a)

KAPLAN TURBINE

b)

reaction turbine

c)

AXIAL FLOW TURBINE

d)

IMPULSE TURBINE

50.

· The turbine draft tube and all related part comprise what is known as

(a)

51.

· When forebay is not part of generating plant design, it will be desirable to provide a (a) in order to relieve the effect of rapid changes in flow rate

52.

· To keep the deflected jet out of the way of the incoming jet, the actual angle is limited to approximately

a)

165 DEGREES

b)

167 degrees

c)

5 DEGREES

d)

17 DEGREES

53.

· The minimum fluid energy required at the pump inlet for satisfactory operation is known as

(a)

54.

· Throttling the input line to a pump and a venting evacuating the receiving pump

a)

Both increase cavitation

b)

Both decrease cavitation

55.

· Traditional reciprocating pumps with pistons and rod can be either single acting or double acting and or suitable up to approximately

a)

2,000

b)

10,000

56.

· Plunger pumps are only single acting are suitable up to approximately

a)

2,000 psi

b)

10,000 psi

57.

· The ratio of the actual to the ideal heat transfer coefficient

a)

ENERGY EFFICIENCY RATIO

b)

TURNDOWN RATIO

c)

PRESSURE RATIO

d)

CLEANLINESS FACTOR

58.

· The ratio of the maximum and minimum mass stream flow rates at with the temperature can be accurately contained by the desuperheater

a)

ENERGY EFFICIENCY RATIO

b)

TURNDOWN RATIO

c)

CLEANLINESS FACTOR

d)

PRESSURE RATIO

59.

· With the reversible generator, the thermal efficiency of ericsson cycle is _____ to that of the carnot cycle

a)

equal

b)

greater

c)

LESSER

60.

· Use to describe the act of flowing the exhaust product out with air fuel mixture

(a)

61.

· compresses and increases the amount of air that enters the cylinder per stroke

(a)

62.

· A form of supercharging in which the exhaust gases drive the supercharger

(a)

63.

· A close heat exchanger that transfer heat from compressed air to cooler air

(a)

64.

· At the control stand, each of the turbine blades must be adjusted manually by a

(a)

65.

· The most commonly used adjusted blade propeller turbine

a)

AXIAL FLOW TURBINE

b)

IMPULSE TURBINE

c)

REACTION TURBINE

d)

KAPLAN TURBINE

66.

· Runner blades are adjusted automatically in synchronization with turbine wicket gates by

(a)

67.

· What is applied to the servomotor from the turbine governor oil system through a generator shaft and through a control valve

(a)

68.

· Used to exhaust air from the casing for starting

(a)

69.

· Advantageous for propeller turbine of all types

a)

Siphon Setting

b)

turbine setting

c)

OPEN FLUME SETTING

d)

sensor

70.

· Turbine setting where one disadvantage is a difficulty of lubricating operating mechanism with consequent relatively rapid wear

a)

Open Flume Setting

b)

turbine setting

c)

SIPHON SETTING

d)

setting

71.

· Which statement is incorrect with Water-Cooled Shell-and-Tube type of Ammonia

a)

Water flowing through passes inside tubes and the refrigerant condensing in the shell

b)

Water flowing through passes outside tubes and the refrigerant condensing in the shell

c)

Water flowing through passes inside tubes and the condenser condensing in the shell

d)

Water flowing through passes outside tubes and the condenser condensing in the shell

72.

· Which statement is correct on the effect of liquid subcooling in a vapor compression system

a)

Subcooling decreases the flashing of the liquid during expansion and increase the refrigerating effect

b)

Subcooling increases the flashing of the liquid during expansion and increase the refrigerating effect

c)

Subcooling decreases the flashing of the gas during expansion and increase the refrigerating effect

d)

Subcooling increases the flashing of the gas during expansion and increase the refrigerating effect

73.

· Which statement is correct on the effect of suction vapor superheating in a vapor compression system

a)

Superheating both increases specific compressor work and refrigerating effect

b)

Superheating both decreases specific compressor work and refrigerating effect

c)

subcooling both increases specific compressor work and refrigerating effect

d)

subcooling both decreases specific compressor work and refrigerating effect

74.

· Which statement is correct on the effect of increasing condensing pressure in a vapor compression system.

a)

decreasing condensing temperature increases specific compressor work and decreases the refrigerating effect

b)

Increasing condensing pressure increases specific compressor work and decreases the refrigerating effect

c)

Increasing refrigerating pressure increases specific compressor work and decreases the refrigerating effect

d)

decreasing refrigerating temperature increases specific compressor work and decreases the refrigerating effect

75.

· Which of the following is incorrect regarding the function of the liquid receiver

a)

Stores oil that is carried along the refrigerant

b)

Stores water that is carried apart the refrigerant

c)

Stores water that is carried along the refrigerant

d)

Stores oil that is carried apart the refrigerant

PIPE NAMING M.E TO

Total questions: 75

Worksheet time: 1hrs 13mins

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