📝 [PIPE] QB 0519 | Mastery Exam 50 – Elements

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Question 1 of 61

1. Question

Chemicals are not added to tower water to reduce___________.

algae
Correct Incorrect Correct answer

foaming
Correct Incorrect Correct answer

Cycles of concentration
Correct Incorrect Correct answer

bacteria
Correct Incorrect Correct answer

Correct

Incorrect
Question 2 of 61

2. Question

As the amount of saturated air is drawn back into a tower decreases, the tower approach_______.

increases
Correct Incorrect Correct answer

remains the same
Correct Incorrect Correct answer

decreases
Correct Incorrect Correct answer

varies
Correct Incorrect Correct answer

Correct

Incorrect
Question 3 of 61

3. Question

As the amount of scale on the refrigerant tubes of an evaporative condenser increase, the amount of make up water _______.

increases
Correct Incorrect Correct answer

remains the same
Correct Incorrect Correct answer

decreases
Correct Incorrect Correct answer

varies
Correct Incorrect Correct answer

Correct

Incorrect
Question 4 of 61

4. Question

As the amount of scale on the refrigerant tubes of an evaporative condenser increase, the refrigeration effect on the system _______.

increase
Correct Incorrect Correct answer

remains the same
Correct Incorrect Correct answer

decreases
Correct Incorrect Correct answer

varies
Correct Incorrect Correct answer

Correct

Incorrect
Question 5 of 61

5. Question

As the cycles of concentration in a tower or evaporative condenser increases, the potential for scale formation on hot surfaces ________.

increases
Correct Incorrect Correct answer

remains the same
Correct Incorrect Correct answer

decreases
Correct Incorrect Correct answer

varies
Correct Incorrect Correct answer

Correct

Incorrect
Question 6 of 61

6. Question

The ______ can only be effectively employed in industrial processes that have a relatively constant refrigeration load

Hand expansion valve
Correct Incorrect Correct answer

Thermal expansion valve
Correct Incorrect Correct answer

Automatic expansion valve
Correct Incorrect Correct answer

Electric expansion valve
Correct Incorrect Correct answer

Correct

Incorrect
Question 7 of 61

7. Question

The device used to transfer forces across a sealed boundary is called a _______.

seat
Correct Incorrect Correct answer

port
Correct Incorrect Correct answer

needle
Correct Incorrect Correct answer

diaphragm
Correct Incorrect Correct answer

Correct

Incorrect
Question 8 of 61

8. Question

The device used to minimize the effects of a large pressure drop across the evaporator is called_______.

diaphragm
Correct Incorrect Correct answer

External equalizer
Correct Incorrect Correct answer

Internal equalizer
Correct Incorrect Correct answer

None of the above
Correct Incorrect Correct answer

Correct

Incorrect
Question 9 of 61

9. Question

An externally equalized valve should be used whenever the pressure drop through the evaporator produces a greater than ____ change in the saturation temperature.

1.2 degree F
Correct Incorrect Correct answer

1.2 degree C
Correct Incorrect Correct answer

1 degree F
Correct Incorrect Correct answer

None of the above
Correct Incorrect Correct answer

Correct

Incorrect
Question 10 of 61

10. Question

Which of the following is not considered when determining the pressure drop available for a TXV?

distributor
Correct Incorrect Correct answer

Changes in the elevation
Correct Incorrect Correct answer

Refrigerant pressure
Correct Incorrect Correct answer

filters
Correct Incorrect Correct answer

Correct

Incorrect
Question 11 of 61

11. Question

As a general rule, the external equalizer connection is made on the suction line approximately _______ beyond the expansion valve’s sensing bulb in the direction of the compressor

A. 24 in
Correct Incorrect Correct answer

A or C
Correct Incorrect Correct answer

C. 60 cm
Correct Incorrect Correct answer

D. Neither of the above
Correct Incorrect Correct answer

Correct

Incorrect
Question 12 of 61

12. Question

Which sensing bulb charge is used in a low and medium temperature applications that do not require pressure limiting characteristics?

Liquid cross-charge
Correct Incorrect Correct answer

Gas cross-charge
Correct Incorrect Correct answer

Straight liquid charge
Correct Incorrect Correct answer

Straight gas charge
Correct Incorrect Correct answer

Correct

Incorrect
Question 13 of 61

13. Question

As the evaporator temperature of a system using a straight liquid-charged sensing bulb decreases, the superheat of the TXV ________.

increase
Correct Incorrect Correct answer

remains the same
Correct Incorrect Correct answer

decreases
Correct Incorrect Correct answer

varies
Correct Incorrect Correct answer

Correct

Incorrect
Question 14 of 61

14. Question

The maximum operating pressure of an evaporator can be limited through the use of a _______ sensing bulb.

A. Liquid cross-charge
Correct Incorrect Correct answer

B. Straight liquid charge
Correct Incorrect Correct answer

C. gas cross-charge
Correct Incorrect Correct answer

B and C
Correct Incorrect Correct answer

Correct

Incorrect
Question 15 of 61

15. Question

As the amount of superheat in a system using a straight liquid-charged sensing bulb increases, the needle of the TXV _____ the flow of refrigerant

increases
Correct Incorrect Correct answer

does not change
Correct Incorrect Correct answer

decreases
Correct Incorrect Correct answer

varies
Correct Incorrect Correct answer

Correct

Incorrect
Question 16 of 61

16. Question

Which type of metering device can be used in multiple flooded evaporator applications?

Low-side float
Correct Incorrect Correct answer

Short tube restrictor
Correct Incorrect Correct answer

High-side float
Correct Incorrect Correct answer

Capillary tube
Correct Incorrect Correct answer

Correct

Incorrect
Question 17 of 61

17. Question

Which type of metering device does not require a critical refrigerant charge?

Low-side float
Correct Incorrect Correct answer

Short tube restrictor
Correct Incorrect Correct answer

High-side float
Correct Incorrect Correct answer

Capillary tube
Correct Incorrect Correct answer

Correct

Incorrect
Question 18 of 61

18. Question

Which type of metering device is used in heat pump applications?

Low-side float
Correct Incorrect Correct answer

Short tube restrictor
Correct Incorrect Correct answer

High-side float
Correct Incorrect Correct answer

Capillary tube
Correct Incorrect Correct answer

Correct

Incorrect
Question 19 of 61

19. Question

Which type of metering device is/has a critical length dimension?

Low-side float
Correct Incorrect Correct answer

Short tube restrictor
Correct Incorrect Correct answer

High-side float
Correct Incorrect Correct answer

Capillary tube
Correct Incorrect Correct answer

Correct

Incorrect
Question 20 of 61

20. Question

Which type of metering device can be used to create a check valve in heat pump system?

Low-side float
Correct Incorrect Correct answer

Short tube restrictor
Correct Incorrect Correct answer

High-side float
Correct Incorrect Correct answer

Capillary tube
Correct Incorrect Correct answer

Correct

Incorrect
Question 21 of 61

21. Question

Which of the metering device can be used in packaged air-conditioning units?

A. Short tube restrictor
Correct Incorrect Correct answer

A and C
Correct Incorrect Correct answer

C. Capillary tube
Correct Incorrect Correct answer

D. Low side float
Correct Incorrect Correct answer

Correct

Incorrect
Question 22 of 61

22. Question

Which of the following system characteristics does not affect the flow rate through a stationary short tube restrictor?

Condenser pressure
Correct Incorrect Correct answer

Orifice size
Correct Incorrect Correct answer

Subcooling
Correct Incorrect Correct answer

Fluid direction
Correct Incorrect Correct answer

Correct

Incorrect
Question 23 of 61

23. Question

Which of the following system changes has the least effect on the flow rate through a stationary short tube restrictor?

Rise in condenser pressure
Correct Incorrect Correct answer

Increase in subcooling
Correct Incorrect Correct answer

Decrease in evaporator pressure
Correct Incorrect Correct answer

Fixed condenser pressure
Correct Incorrect Correct answer

Correct

Incorrect
Question 24 of 61

24. Question

Which of the following is not a consideration when selecting a cap tube for an application?

Condenser pressure
Correct Incorrect Correct answer

Heat of compression
Correct Incorrect Correct answer

Evaporator pressure
Correct Incorrect Correct answer

Flow rate of refrigerant
Correct Incorrect Correct answer

Correct

Incorrect
Question 25 of 61

25. Question

As the subcooling of the refrigerant increases, the flow through a high-side float____

increases
Correct Incorrect Correct answer

remains the same
Correct Incorrect Correct answer

decreases
Correct Incorrect Correct answer

varies
Correct Incorrect Correct answer

Correct

Incorrect
Question 26 of 61

26. Question

Refrigerant piping is designed and installed in a manner that______

Minimizes refrigerant pressure losses in the connecting piping
Correct Incorrect Correct answer

Ensures the continuous return of oil to the compressor crankcase
Correct Incorrect Correct answer

Prevents liquid refrigerant from entering compressor during start up
Correct Incorrect Correct answer

All of the above
Correct Incorrect Correct answer

Correct

Incorrect
Question 27 of 61

27. Question

A receiver tank is used to _______

Hold the excess refrigerant during lighter loads
Correct Incorrect Correct answer

Collect oil from the base of a riser
Correct Incorrect Correct answer

Separate liquid from vapor refrigerant
Correct Incorrect Correct answer

All of the above
Correct Incorrect Correct answer

Correct

Incorrect
Question 28 of 61

28. Question

Which fitting produces the greatest pressure drop?

90 degrees standard elbow
Correct Incorrect Correct answer

90-degree street ell
Correct Incorrect Correct answer

45 degrees standard elbow
Correct Incorrect Correct answer

45-degree street ell
Correct Incorrect Correct answer

Correct

Incorrect
Question 29 of 61

29. Question

Which style valve produces the least change in the saturation temperature of refrigerant flowing through it?

Globe
Correct Incorrect Correct answer

Check
Correct Incorrect Correct answer

Gate
Correct Incorrect Correct answer

Angle
Correct Incorrect Correct answer

Correct

Incorrect
Question 30 of 61

30. Question

Which of the following changes may increase the flashing in a liquid line?

Increasing the subcooling
Correct Incorrect Correct answer

Increasing the pipe diameter
Correct Incorrect Correct answer

Decreasing the pipe length
Correct Incorrect Correct answer

Decreasing the line diameter
Correct Incorrect Correct answer

Correct

Incorrect
Question 31 of 61

31. Question

As the refrigerant load decreases, the amount of refrigerant catering through-flow receiver ______

increases
Correct Incorrect Correct answer

remains the same
Correct Incorrect Correct answer

decreases
Correct Incorrect Correct answer

varies
Correct Incorrect Correct answer

Correct

Incorrect
Question 32 of 61

32. Question

Discharge line lubricant separators are not usually employed in system ______

Operating at low temperature
Correct Incorrect Correct answer

Utilizing non-oil returning evaporators
Correct Incorrect Correct answer

System with a small range of capacity control
Correct Incorrect Correct answer

They are used in all of the above system
Correct Incorrect Correct answer

Correct

Incorrect
Question 33 of 61

33. Question

A device used as a visual indicator of the charge in a refrigeration system is a ______

Sight glass
Correct Incorrect Correct answer

Drier
Correct Incorrect Correct answer

Pressure switch
Correct Incorrect Correct answer

Strainer
Correct Incorrect Correct answer

Correct

Incorrect
Question 34 of 61

34. Question

Which pressure regulating valve maintains a low limit in an evaporator?

OROA
Correct Incorrect Correct answer

SPR
Correct Incorrect Correct answer

ORI
Correct Incorrect Correct answer

EPR
Correct Incorrect Correct answer

Correct

Incorrect
Question 35 of 61

35. Question

Which type of low-side pressure regulator is used to prevent a compressor form overloading?

Low-side float
Correct Incorrect Correct answer

EPR
Correct Incorrect Correct answer

SPR
Correct Incorrect Correct answer

OROA
Correct Incorrect Correct answer

Correct

Incorrect
Question 36 of 61

36. Question

Which type of control requires a control differential?

A. Throttling
Correct Incorrect Correct answer

B. Modulating
Correct Incorrect Correct answer

C. Two-position
Correct Incorrect Correct answer

A and C
Correct Incorrect Correct answer

Correct

Incorrect
Question 37 of 61

37. Question

______ is a device used to remove acids from a system after a burn-out

Receiver
Correct Incorrect Correct answer

Suction filter-drier
Correct Incorrect Correct answer

Suction line heat exchanger
Correct Incorrect Correct answer

Oil separator
Correct Incorrect Correct answer

Correct

Incorrect
Question 38 of 61

38. Question

Which of these devices does not operate in response to a change in its inlet pressure?

A. EPR
Correct Incorrect Correct answer

B. ORI
Correct Incorrect Correct answer

C. SPR
Correct Incorrect Correct answer

A and C
Correct Incorrect Correct answer

Correct

Incorrect
Question 39 of 61

39. Question

Which of the following high-side pressure regulators operates on an increase in differential pressure?

ORI
Correct Incorrect Correct answer

ODO
Correct Incorrect Correct answer

OROA
Correct Incorrect Correct answer

None of the above
Correct Incorrect Correct answer

Correct

Incorrect
Question 40 of 61

40. Question

Which of the following system characteristics is not needed when selecting the proper water regulating valve for a water-cooled application?

The necessary flow rate of water
Correct Incorrect Correct answer

The condensing pressure
Correct Incorrect Correct answer

The available water pressure drop
Correct Incorrect Correct answer

The minimum ambient temperature
Correct Incorrect Correct answer

Correct

Incorrect
Question 41 of 61

41. Question

Which of the following methods cannot be used for oil level equalization between multiple compressors operating in parallel?

A crankcase pressure equalizing tube along with an oil equalizing tube
Correct Incorrect Correct answer

Oil level controls on each crankcase fed from an oil receiver
Correct Incorrect Correct answer

A single pipe located below the oil level in the crankcases.
Correct Incorrect Correct answer

All of the above
Correct Incorrect Correct answer

Correct

Incorrect
Question 42 of 61

42. Question

If a compressor has more capacity than the evaporator, the saturated suction pressure will be ______ design conditions.

Greater than
Correct Incorrect Correct answer

The same as
Correct Incorrect Correct answer

Less than
Correct Incorrect Correct answer

Identical
Correct Incorrect Correct answer

Correct

Incorrect
Question 43 of 61

43. Question

The device used in a control loop to measure the controlled variable is called a ______

Controlled device
Correct Incorrect Correct answer

Controller
Correct Incorrect Correct answer

Summing junction
Correct Incorrect Correct answer

Sensor
Correct Incorrect Correct answer

Correct

Incorrect
Question 44 of 61

44. Question

If the thermal capacitance of a process is low, the control differential must be ______ to prevents short-cycling of the compressor

Increased
Correct Incorrect Correct answer

Decreased
Correct Incorrect Correct answer

Changing the differential has no bearing on short- cycling
Correct Incorrect Correct answer

Identical
Correct Incorrect Correct answer

Correct

Incorrect
Question 45 of 61

45. Question

Which type of control requires a control differential?

A. Throttling
Correct Incorrect Correct answer

B. Modulating
Correct Incorrect Correct answer

C. Two-position
Correct Incorrect Correct answer

A and B
Correct Incorrect Correct answer

Correct

Incorrect
Question 46 of 61

46. Question

When the pressure on the high-pressure side of the system decreases below the high-limit set point ______ the control differential, an auto-resetting high-pressure control closes the control circuit to the condensing unit, enabling the compressor

Plus
Correct Incorrect Correct answer

Times
Correct Incorrect Correct answer

Minus
Correct Incorrect Correct answer

Divide
Correct Incorrect Correct answer

Correct

Incorrect
Question 47 of 61

47. Question

Which method of compressor capacity control does not produce a reduction in condensing power requirements when the compressor capacity is decreased?

Cylinder unloading
Correct Incorrect Correct answer

Multiple compressor
Correct Incorrect Correct answer

Variable speed drives
Correct Incorrect Correct answer

Hot gas bypass
Correct Incorrect Correct answer

Correct

Incorrect
Question 48 of 61

48. Question

A hot gas bypass valve responds to changes in the system’s ______ pressure.

Liquid line
Correct Incorrect Correct answer

Discharge
Correct Incorrect Correct answer

Suction
Correct Incorrect Correct answer

None of the above
Correct Incorrect Correct answer

Correct

Incorrect
Question 49 of 61

49. Question

As the difference between the cut – in and cut – out pressures increases, ______.

The range increases and short-cycling increases
Correct Incorrect Correct answer

The range increases and short-cycling decreases
Correct Incorrect Correct answer

The range decreases and cycling is unaffected
Correct Incorrect Correct answer

The range decreases and short-cycling increases
Correct Incorrect Correct answer

Correct

Incorrect
Question 50 of 61

50. Question

As the load of a refrigeration system increases, the on cycle of the compressor ______

increases
Correct Incorrect Correct answer

remains the same
Correct Incorrect Correct answer

decreases
Correct Incorrect Correct answer

Approaches zero
Correct Incorrect Correct answer

Correct

Incorrect
Question 51 of 61

51. Question

Intercoolers are devices used in direct staged system to ______

Increase the temperature of the liquid refrigerant leaving the condenser
Correct Incorrect Correct answer

Reduce the pressure of the liquid refrigerant leaving the condenser
Correct Incorrect Correct answer

Reduce the pressure of the vapor entering a higher stage compressor
Correct Incorrect Correct answer

Reduce the temperature of the vapor entering higher stage compressor
Correct Incorrect Correct answer

Correct

Incorrect
Question 52 of 61

52. Question

Which type of intercooler mixes the liquid refrigerant from the condenser with the discharge vapor of the lower stage compressor?

Open
Correct Incorrect Correct answer

Dry expansion
Correct Incorrect Correct answer

Shell and coil
Correct Incorrect Correct answer

None of the above
Correct Incorrect Correct answer

Correct

Incorrect
Question 53 of 61

53. Question

Which of the following systems has the most complicated oil return system?

Direct staged
Correct Incorrect Correct answer

Ammonia absorption
Correct Incorrect Correct answer

Cascade
Correct Incorrect Correct answer

Lithium bromide absorption
Correct Incorrect Correct answer

Correct

Incorrect
Question 54 of 61

54. Question

The type of unit that incorporates several stages of compression using different refrigerants is called a ______ system.

Direct expansion
Correct Incorrect Correct answer

Absorption
Correct Incorrect Correct answer

Cascade
Correct Incorrect Correct answer

Direct stage
Correct Incorrect Correct answer

Correct

Incorrect
Question 55 of 61

55. Question

Which refrigerant is not used in the high stage of a cascade system?

R-23
Correct Incorrect Correct answer

R-717
Correct Incorrect Correct answer

R-22
Correct Incorrect Correct answer

R-134a
Correct Incorrect Correct answer

Correct

Incorrect
Question 56 of 61

56. Question

The flow cycle for the refrigerant in an absorption chiller is a ______

From the condenser to the absorber to the evaporator to the generator
Correct Incorrect Correct answer

From the condenser to the generator to the absorber to the evaporator
Correct Incorrect Correct answer

From the condenser to the evaporator to the absorber to the generator
Correct Incorrect Correct answer

From the condenser to the absorber to the generator to the evaporator
Correct Incorrect Correct answer

Correct

Incorrect
Question 57 of 61

57. Question

The refrigerant in an absorber changes phase from a vapor to a liquid in the ______

Evaporator
Correct Incorrect Correct answer

Absorber
Correct Incorrect Correct answer

Rectifier
Correct Incorrect Correct answer

Generator
Correct Incorrect Correct answer

Correct

Incorrect
Question 58 of 61

58. Question

The weak solution in an absorber develops in the ______

Evaporator
Correct Incorrect Correct answer

Absorber
Correct Incorrect Correct answer

Condenser
Correct Incorrect Correct answer

Generator
Correct Incorrect Correct answer

Correct

Incorrect
Question 59 of 61

59. Question

The strong solution in an absorber develops in the ______

Evaporator
Correct Incorrect Correct answer

Absorber
Correct Incorrect Correct answer

Condenser
Correct Incorrect Correct answer

Generator
Correct Incorrect Correct answer

Correct

Incorrect
Question 60 of 61

60. Question

The refrigerant in an absorber releases its high-pressure latent heat of condensation in the ______

Evaporator
Correct Incorrect Correct answer

Absorber
Correct Incorrect Correct answer

Condenser
Correct Incorrect Correct answer

Generator
Correct Incorrect Correct answer

Correct

Incorrect
Question 61 of 61

61. Question

Highest pressure drop in a vapor-compression refrigeration cycle occurs in the:

Compressor
Correct Incorrect Correct answer

Evaporator
Correct Incorrect Correct answer

Compressor
Correct Incorrect Correct answer

Expansion valve
Correct Incorrect Correct answer

Correct

Incorrect

📝 [PIPE] QB 0519 | Mastery Exam 50 – Elements

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