Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN: 9781337399128
Author: Russell E. Smith
Publisher: Cengage Learning
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Question
Chapter 4, Problem 2RQ
To determine
The importance of use of electrical meters for service technicians.
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H.b- When you're first starting a PM program, and you want to check motor starter and contactor contacts,how often should you perform a PM inspection on these devices?A. Every two monthsB. Every six monthsC. Every yearD. Every month
c.b. Which one of the following isn’t a goal of a PM program?A. Limit downtimeB. Save a company money on maintenance so that the cost of its products stays competitiveC. Keep a machine running within its specificationsD. Use fewer repair parts and less time to install those parts
c.c. Which of the following tasks is an uptime PM task that can be performed while the machine is runningduring production?A. Checking the motor starter contacts for burned and pitted areasB. Checking for excess noise or vibration on the machineC. Checking the condition of the couplingD. Tightening electrical connections
The circuit breaker at a power seat motor continuously trips: Technician A says that this could be caused by a seat track problem that is causing mechanical resistance. Technician B says that this could be caused by corrosion at the motor, which is causing electrical re-sistance. Who is correct?
What is a Thermocouple:
Select one:
a. A Thermocouple is a temperature
sensor that uses a small length of
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b. A Thermocouple is a temperature
sensor that consists of two wires of
similar metals joined at one end.
C. A Thermocouple is a type of resistor
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d. A Thermocouple is a temperature
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Chapter 4 Solutions
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Ch. 4 - What are the three most common electric meters...Ch. 4 - Prob. 2RQCh. 4 - What do most analog meters use to facilitate the...Ch. 4 - How does an ammeter work?Ch. 4 - What are the two types of ammeters? Which type is...Ch. 4 - Prob. 6RQCh. 4 - How can a very small ampere draw be measured with...Ch. 4 - If a conductor was wrapped around the jaws of a...Ch. 4 - Explain the operation of an analog voltmeter.Ch. 4 - Air-conditioning or refrigeration equipment can...
Ch. 4 - Prob. 11RQCh. 4 - What precaution should be taken when using an...Ch. 4 - Prob. 13RQCh. 4 - What is a short circuit?Ch. 4 - Prob. 15RQCh. 4 - What factors should be considered when purchasing...Ch. 4 - Match the following terms.Ch. 4 - Prob. 18RQCh. 4 - Prob. 19RQCh. 4 - An in-line ammeter must be connected to a circuit...Ch. 4 - What is the difference between an analog meter...Ch. 4 - Give three advantages of a digital electric meter.Ch. 4 - What basic concept is used in a digital meter to...Ch. 4 - What is the basic accuracy of most analog and...Ch. 4 - How many digits will the 312- and 412-digit...Ch. 4 - Prob. 26RQCh. 4 - The ohmmeter differs from other types of meters in...Ch. 4 - Compare the digital and analog types of electric...
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- True or False? A lab scope is a visual voltmeter that shows voltage over a period of time.arrow_forwardThe maximum power is delivered to a circuit when source resistance is load resistance. O a. Less than O b. Greater than or equal to O c. Equal to O d. Greater thanarrow_forwardhile discussing NTC thermistors; Technician A says that some systems use this type of thermistor as a protection device. Technician B says that when there is high current in a circuit, the resistance of the thermistor increases and causes a decrease in current flow. Who is correct?arrow_forward
- MULTIPLE CHOICE -The answer is one of the options below please solve carefully and circle the correct option Please write clear .arrow_forwardTrue or False 1. It is acceptable to use a hoist to lift something that weighs more than the rating on the hoist when the load is lifted carefully. 2. Typically, combustible material accidents occur at higher temperatures while flammable material accidents occur at room temperature. 3. Water reactive chemicals include calcium carbide, cyclooctene, metal hydrides, and metals like sodium and potassium. 4. When driving material lifting equipment, workers should maintain at least a 5-foot clearance from overhead power lines. 5. Workers should use at least 2 straps placed equally from the center when lifting a long I-beam. ******************************************************************************************** Multiple Choice 1. Which of the following chemicals is not considered a liver toxin? A. Glacial acetic acid B. Carbon Tetrachloride C. Ethanol D. Trichloroethylene 2. Which of the following is a safety practice intended to protect workers from a lightning strike? A. Use a metal…arrow_forwardTrue or False? The same information available in service manuals and bulletins may also be available electronically on DVDs and the Internet.arrow_forward
- Therapeutic Instrumentationarrow_forwardAlternation and inspection of equipment are the primary functions of maintenance. Select one: True Falsearrow_forwardWhile measuring resistance: Technician A uses an ohmmeter to measure resistance of a component before disconnecting it from the circuit. Technician B uses a voltmeter to measure voltage drop. A circuit with very low resistance will drop zero or very little voltage. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forward
- While measuring the resistance of a wire with an ohmmeter: Technician A says that if low resistance is shown on the meter, the wire is shorted. Technician B says that if no resistance is measured, the wire is shorted. Who is correct? Technician A Technician B Both A and B d. Neither A nor Barrow_forward2. Answer the following table Types of Advantage Disadvantage Relation Formula Application Dynamometerarrow_forwardWhich of the following is not a characteristic ofparallel circuits?a. Total circuit resistance is always less thanthe resistance of the leg with the lowest totalresistance.b. The current through each leg will be differentif the resistance values are different.c. The sum of the resistance in each leg equalsthe total circuit resistance.d. Source voltage will be dropped across eachleg of the parallel circuit.arrow_forward
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