Z51 REFRIGERATION TEST LATEST TEST | ALL
QUESTIONS AND CORRECT ANSWERS |
LATEST VERSION | GRADED A+ | VERIFIED
ANSWERS
A refrigeration system uses jet ejector to raise settled oil mixed with
refrigerant to the oil pump. If a restriction in the refrigerant flow to the jet
ejector develops: ------CORRECT ANSWER---------------There may be
insufficient head to lift the oil
An indirect, low temperature refrigerant system frequently uses glycol,
instead of salt brine as the intermediate cooling medium. An advantage of
this choice is: ------CORRECT ANSWER---------------The elimination of
corrosion
In relation to the suction pressure of a compressor, the reading on the oil
pressure guage should read in the range, closer to: ------CORRECT
ANSWER---------------15 to 30 PSI higher
Non-condensable gases like air, oil vapor, or nitrogen travel through a
refrigerant system with the refrigerant they usually accumulate in the: ------
CORRECT ANSWER---------------Condenser
The advantage of forced draft cooling tower over natural draft cooling
towers is: ------CORRECT ANSWER---------------Smaller tower size
,The sole refrigeration engineer on duty in a building is permitted to leave
the building refrigeration system when it is in operation only when: ------
CORRECT ANSWER---------------Relieved by another licensed refrigeration
engineer
A system controlled by a TXV shows high discharge pressure and high
normal subcooling. The cause is most probably a: ------CORRECT
ANSWER---------------Refrigerant overcharge
Which of the following is a correct statement? ------CORRECT ANSWER----
-----------2.5 gallons of water weighs 20.8 pounds
Liquid level gauge glasses (except the bull's eye) are generally equipped
with: ------CORRECT ANSWER---------------Automatic shut off valves only
Copper and aluminum are frequently used for condenser tubes in
refrigeration system. These metals are used because of their: ------
CORRECT ANSWER---------------High heat transfer coefficient
Assume that a refrigeration engineer has a choice of four valves to select
from. Which of the following is the most effective type of valve to control
pressure? ------CORRECT ANSWER---------------Plug valve
Where must the Material Safety Data Sheets be located? ------CORRECT
ANSWER---------------Where available to all employees
,The oil collected in an oil separator is generally: ------CORRECT ANSWER-
--------------Returned to the compressor
What is the function of gland steam? ------CORRECT ANSWER---------------
Seal the turbine rotor carbon rings
Regarding the functioning of steam turbine, how is the water level
controlled in the surface condenser hot well? ------CORRECT ANSWER-----
----------Operation of the recirculation and overboard valves
The cause of the starved evaporator might be: ------CORRECT ANSWER---
------------Low refrigerant charge
A refrigeration engineer is running two centrifugal condenser water pumps
in parallel. One of the pumps is at it's maximum pumping rate. If by
mistake, the refrigeration engineer throttles back on the discharge valve of
the other pump, the most likely effect will be: ------CORRECT ANSWER-----
----------A reduction on the total flow rate to the condenser
The total amount of heat to be removed from the refrigerant in a condenser
equals the heat picked up in the: ------CORRECT ANSWER---------------
Evaporator plus the heat of compression
The amount of electrical power used to operate a solenoid valve or a motor
is measured in: ------CORRECT ANSWER---------------Volts
, Of the following, the most common metering device used today in
reciprocating commerical refrigeration system under three tons capacity is:
------CORRECT ANSWER---------------TEV
The purpose of wear rings in a centrifugal pump is to: ------CORRECT
ANSWER---------------Prevent wearing of the pump housing and impeller
You are the engineer running a 2000-ton (steam driven turbine) centrifugal
refrigeration system, a refrigeration system supplies chilled water to a
college campus with multiple buildings. While making rounds, you notice
that the condenser water coming back down from the 9-cell cooling tower
on the roof is at a temperature of 90F. You want to make an adjustment to
bring the temperature of the condenser water down to 85F. Which one of
the following immediate actions would you take? ------CORRECT
ANSWER---------------Increase the speed of the cooling tower fans
A water chiller is equipped with a reciprocating compressor, a thermostatic
expansion valve, and an air cooled condenser. A restriction in the
refrigerant liquid line would result in: ------CORRECT ANSWER---------------
High suction superheat
A solenoid valve is used to allow a reciprocating refrigeration machine to
adapt to the load on the system. The opening of the solenoid valve is
caused by: ------CORRECT ANSWER---------------An electrical current
creating a magnetic field
The process by which refrigerant is extracted and cleaned for reuse without
requirements for reclamation is called: ------CORRECT ANSWER-------------
--Recycling
QUESTIONS AND CORRECT ANSWERS |
LATEST VERSION | GRADED A+ | VERIFIED
ANSWERS
A refrigeration system uses jet ejector to raise settled oil mixed with
refrigerant to the oil pump. If a restriction in the refrigerant flow to the jet
ejector develops: ------CORRECT ANSWER---------------There may be
insufficient head to lift the oil
An indirect, low temperature refrigerant system frequently uses glycol,
instead of salt brine as the intermediate cooling medium. An advantage of
this choice is: ------CORRECT ANSWER---------------The elimination of
corrosion
In relation to the suction pressure of a compressor, the reading on the oil
pressure guage should read in the range, closer to: ------CORRECT
ANSWER---------------15 to 30 PSI higher
Non-condensable gases like air, oil vapor, or nitrogen travel through a
refrigerant system with the refrigerant they usually accumulate in the: ------
CORRECT ANSWER---------------Condenser
The advantage of forced draft cooling tower over natural draft cooling
towers is: ------CORRECT ANSWER---------------Smaller tower size
,The sole refrigeration engineer on duty in a building is permitted to leave
the building refrigeration system when it is in operation only when: ------
CORRECT ANSWER---------------Relieved by another licensed refrigeration
engineer
A system controlled by a TXV shows high discharge pressure and high
normal subcooling. The cause is most probably a: ------CORRECT
ANSWER---------------Refrigerant overcharge
Which of the following is a correct statement? ------CORRECT ANSWER----
-----------2.5 gallons of water weighs 20.8 pounds
Liquid level gauge glasses (except the bull's eye) are generally equipped
with: ------CORRECT ANSWER---------------Automatic shut off valves only
Copper and aluminum are frequently used for condenser tubes in
refrigeration system. These metals are used because of their: ------
CORRECT ANSWER---------------High heat transfer coefficient
Assume that a refrigeration engineer has a choice of four valves to select
from. Which of the following is the most effective type of valve to control
pressure? ------CORRECT ANSWER---------------Plug valve
Where must the Material Safety Data Sheets be located? ------CORRECT
ANSWER---------------Where available to all employees
,The oil collected in an oil separator is generally: ------CORRECT ANSWER-
--------------Returned to the compressor
What is the function of gland steam? ------CORRECT ANSWER---------------
Seal the turbine rotor carbon rings
Regarding the functioning of steam turbine, how is the water level
controlled in the surface condenser hot well? ------CORRECT ANSWER-----
----------Operation of the recirculation and overboard valves
The cause of the starved evaporator might be: ------CORRECT ANSWER---
------------Low refrigerant charge
A refrigeration engineer is running two centrifugal condenser water pumps
in parallel. One of the pumps is at it's maximum pumping rate. If by
mistake, the refrigeration engineer throttles back on the discharge valve of
the other pump, the most likely effect will be: ------CORRECT ANSWER-----
----------A reduction on the total flow rate to the condenser
The total amount of heat to be removed from the refrigerant in a condenser
equals the heat picked up in the: ------CORRECT ANSWER---------------
Evaporator plus the heat of compression
The amount of electrical power used to operate a solenoid valve or a motor
is measured in: ------CORRECT ANSWER---------------Volts
, Of the following, the most common metering device used today in
reciprocating commerical refrigeration system under three tons capacity is:
------CORRECT ANSWER---------------TEV
The purpose of wear rings in a centrifugal pump is to: ------CORRECT
ANSWER---------------Prevent wearing of the pump housing and impeller
You are the engineer running a 2000-ton (steam driven turbine) centrifugal
refrigeration system, a refrigeration system supplies chilled water to a
college campus with multiple buildings. While making rounds, you notice
that the condenser water coming back down from the 9-cell cooling tower
on the roof is at a temperature of 90F. You want to make an adjustment to
bring the temperature of the condenser water down to 85F. Which one of
the following immediate actions would you take? ------CORRECT
ANSWER---------------Increase the speed of the cooling tower fans
A water chiller is equipped with a reciprocating compressor, a thermostatic
expansion valve, and an air cooled condenser. A restriction in the
refrigerant liquid line would result in: ------CORRECT ANSWER---------------
High suction superheat
A solenoid valve is used to allow a reciprocating refrigeration machine to
adapt to the load on the system. The opening of the solenoid valve is
caused by: ------CORRECT ANSWER---------------An electrical current
creating a magnetic field
The process by which refrigerant is extracted and cleaned for reuse without
requirements for reclamation is called: ------CORRECT ANSWER-------------
--Recycling
