Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Chapter 50, Problem 10RQ
To determine
The function of the return-air damper.
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Lockout may involve:
Opening a disconnect switch.
b. Closing a valve.
Placing a block in the equipment.
d. All of the above.
a.
C.
Lockout locks:
Can be used to lock tool boxes, storage sheds, etc.
b. Can be used only for lockout purposes.
Are provided by the equipment manufacturer.
d.
a.
C.
Must be bright orange in color.
Authorized employees must be trained:
To recognize hazardous energy sources, and to know the
type and magnitude of the hazardous energy sources.
b.
a.
To perform the lockout/tagout procedure.
C.
When an audit shows deficiencies with the procedure.
d.
All of the above.
When authorized employees perform a shutdown they must:
a. Notify all affected employees that they are starting a lockout
procedure,
b. Locate all energy sources that power the equipment.
Follow the procedures to shut down each machine.
d. All of the above.
с.
If several people are needed to work on a piece of equipment:
a. The first worker to arrive to the job is the one who applies
the locks.
b. Their supervisor is the only one who needs to apply a lock.
c. Each worker must apply his or her own lock.
d. The person who will be the…
Two technicians are discussing a coolant
drain and refill. Technician A says that
draining the coolant removes all coolant
from the system. Technician B says that any
trapped air in the system will bleed itself out
automatically. Who is correct?
Select one:
a. Technician A only
b. Technician B only
c. Both A and B
d. Neither A nor B
Chapter 50 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 50 - Which of the following is true regarding the...Ch. 50 - Which process would best represent the opposite of...Ch. 50 - Mixed air is best described as the combination of...Ch. 50 - Which of the following should be taken into...Ch. 50 - A bonded roof is one that has A. reinforced steel...Ch. 50 - Properly installed roof curbs will reduce the...Ch. 50 - When rigging a unit to the roof, what minimum...Ch. 50 - What is the acceptable method for communicating...Ch. 50 - Prob. 9RQCh. 50 - Prob. 10RQ
Ch. 50 - The most efficient way to establish the best...Ch. 50 - Free-cooling can be accomplished if the
A....Ch. 50 - Prob. 13RQCh. 50 - Prob. 14RQCh. 50 - Explain why the outside air damper is typically...Ch. 50 - Briefly explain the purpose of ASHRAE Standard 62.Ch. 50 - Explain the concept of demand control ventilation.Ch. 50 - Explain how carbon dioxide levels can be used to...Ch. 50 - Describe the blowers used on VAV systems.Ch. 50 - A cooling-only VAV box has all of the following...Ch. 50 - Which of the following is true regarding a reheat...Ch. 50 - Variable refrigerant flow systems sense the...Ch. 50 - The acronym PID stands for ______, _____, and...Ch. 50 - Explain the main benefit of a heat-recovery VRF...Ch. 50 - The pump on a dry cooler can direct water to...Ch. 50 - During low ambient conditions, the space cooling...
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- b.has air-conditioning and is an automatic.c.has air-conditioning or is an automatic.d.has air-conditioning given that it is an automatic.e.is an automatic if it has air-conditioning.arrow_forwardto run d. both a and b 44. Ifa thermostatic expansion valve's thermal bulb came loose from the suction line at the outlet of the evaporator, whích of the following could result? The bulb pressure would increase and the c. thermostatic expansion valve would open. b. The superheat in the evaporator would decrease. a. Liquid refrigerant would flow back to the compressor. d. All of the above are correct. 45. If the thermal bulb assembly develops a leak, what will occur? All of the system's refrigerant will leak a. The valve will open to allow more c. refrigerant to flow. d. It will have no effect on system operation. out. b. The bulb pressure will reduce and the valve will close. 46. The purpose of an externally equalized thermostatic expansion valve is to compensate for excessive evaporator pressure drop b. allow system to equalize faster a. prevent the expansion valve from frosting up d. c. allow refrigerant to expand in the compressor 47. The primary function of an expansion device is…arrow_forwardIn cooling tower the blow down loss means a. the total water loss due to blowing of very fast air in cooling tower. b. the water loss due to leakges c. the water loss in the form of droplets d. the water loss to control impurities and saltsarrow_forward
- The function of _________ is to increase the kinetic energy of gases. a. Casing b. Piston c. Impeller d. Diffuserarrow_forwardI need the answer as soon as possiblearrow_forwardThe acronym 'PASS' is used to explain the method of using fire extinguishers. In this, 'A' stands for B. Angle A. Adjust D. Air C. Aimarrow_forward
- For a cooling tower, the drift loss means, a. water lost in the form of droplets b. leakge losses due to leakges c. water loss to control concentration of salt and other impurities. d. water lost in the form of evaporationarrow_forwardWhile discussing relative humidity: Technician A says that the amount of moisture that air can hold is directly related to the temperature of the air. Technician B says that the colder the air is, the more moisture it can hold. Who is correct?arrow_forward5.A. If there's no adjusting valve at the outlet of a large pump, there should be a(n)A. aerator in the pump.B. orifice plate in the outlet.C. flow valve at the inlet. 5.B. A conveyor that uses a line shaft to turn the rollers should have the line shaft bearings checked on a PMinspection everyA. four weeks.B. six months.C. YEAR 5.C. You're going to install a new chain on a power transmission system. What else should you do with thissystem?A. Replace both sprocketsB. Check shaft bearings D. Check the motor and gearboxarrow_forward
- From the following identify the true statement relating to the term Preventive maintenance The maintenance done after the failure of machine and can't save energy during the process. O The maintenance done before the failure of machine and can save energy during the process. O The maintenance done before the failure of machine and can't save energy during the process. The maintenance done after the failure of machine and can save energy during the process.arrow_forwardWhich of the following is not a true of group lockout or tagout? a. Each employee working on the equipment is an authorized employee b. A supervisor may attach a lock for an entire work crew. c. Each person working on the equipment must have a lock or tag d. A supervisor should be the first or last person to attach a lock or tagarrow_forward2.A. You can usually check for a leak in a vacuum system by looking at or feelingA. at the exhaust of the vacuum pump.B. at the vacuum gauge at the vacuum pump.C. for signs of dirt on the piping. 2.B. When you measure the voltage drop across a set of contacts, you'reA. checking the quality of the contact set.B. sensing how much current is flowing in the circuit.C. measuring the equivalent motor resistance. 2.C. A chain-drive system can be aligned easier than a belt-drive system since the chain-drive systemA. can have a string left on the sprockets after the alignment is complete.B. can have the chain removed while the final alignment is taking place.C. is less critical to misalignment.arrow_forward
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