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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- 14.A. What type of seal system is constructed of a hard brittle material and is often used in a pump to sealbetween the pump and the motor?A. SteelB. CeramicC. Glass 14.B. When a pneumatic solenoid fails, the failure is normally due to aA. weak pilot.B. bad spool.C. ripped seal. 14.C. When you're dealing with a PM task for a drive-belt form of conveyor, and you must make trackingadjustments to the belt, you shouldA. pull the belt back with pliers or a belt puller and see if it returns to the previous tracking marks. B. perform tracking adjustments at both ends of the belt.C. make a small adjustment, then continue with small adjustments as needed.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_forwardThe function of _________ is to increase the kinetic energy of gases. a. Casing b. Piston c. Impeller d. Diffuserarrow_forward
- The 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_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
- Which of the following is a gas charged accumulator? a. spring loaded accumulator b. bladder type c. all of the mentioned d. weighted accumulatorarrow_forwardFor 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_forwardWhich beaker best illustrates what happens when the following acids are dissolved in water?a. HNO2b. HNO3c. HC1d. HFe. HC2H3O2arrow_forward
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