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 16, Problem 8RQ
To determine
Tools that are used by technician in pneumatic control.
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What is the function of a pilot-to-close check valve in a pneumatic system?
A. Allows flow in reverse direction but to foward
B. Blocks flow in reverse direction but not forward
C. Allows flow in either direction
D. Blocks flow in either direction
Allows flow in reverse direction but not forward.
Blocks flow in reverse direction but not forward.
Allows flow in either direction.
Blocks flow in either direction.
The following transducer is used to measure the temperature.
a.
Bourdon tube
b.
Bellows
c.
Thermocouple
d.
Strain Gauge
2.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.
Chapter 16 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 16 - True or False: Pneumatic controls are...Ch. 16 - Pneumatic controls are operated by A. water. B....Ch. 16 - One advantage of a modern control system is A....Ch. 16 - A control loop contains _______, _______, and...Ch. 16 - Pneumatic air must A. be clean and dry. B. have...Ch. 16 - The air supplied to a diaphragm is 20 psig, and...Ch. 16 - When a large volume of air is needed at a...Ch. 16 - Prob. 8RQCh. 16 - Prob. 9RQCh. 16 - An analog control signal A. has an infinite number...
Ch. 16 - Another term used to describe sensitivity in...Ch. 16 - Prob. 12RQCh. 16 - Prob. 13RQCh. 16 - One of the major components of a residential...Ch. 16 - Prob. 15RQCh. 16 - Describe a control device, and give three examples...Ch. 16 - Describe what a sensor does in a DDC system used...Ch. 16 - What is the difference between an active and a...Ch. 16 - A control system consists of what three basic...Ch. 16 - List six advantages that DDC control systems have...Ch. 16 - Describe the difference between the analog and...Ch. 16 - Describe the difference between an open-loop and a...
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- True or False: Pneumatic controls are explosion-proof.arrow_forwardFor a hydraulic power unit, this part indicates the amount of oil in the reservoir. Usually, it also indicates the temperature. a. liquid level gauge b. filler/breather c. pressure gauge d. suction strainerarrow_forwardA technician is inspecting a vehicle and finds the upper radiator hose is collapsed, and the cooling system pulled into a vacuum when cold. Technician A states that a leak in the surge tank could be the cause. Technician B states that the radiator cap is most likely defective. Who is correct? Select one: a. Technician A only b. Technician B only c. Both Technicians A and B d. Neither Technician A nor Barrow_forward
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- On the low-pressure side of a double diaphragm seal system, the transmitter measures a pressure of 108 in. WC when the tank is empty. Which process should you apply before measuring on the high-pressure side? Low water level cutoff Ratholing Zero suppression Blowdownarrow_forward2. Two sections must be discussed: 2.1. Talking about the material from which the air conditioner compressor is made with a presentation of the properties of the material 2.2. Preparing the executive drawing of the air conditioner compressor (job shop drawing) and it should include (dimensional and geometrical tolerances)arrow_forwardFor a hydraulic power unit, this part reads the oil pressure at the pump outlet a. filler/breather b. suction strainer c. liquid level gauge d. pressure gaugearrow_forward
- 1-While refilling an 8-quart (7.57 L) system with coolant: Technician A initially puts in 4 quarts (3.78 L) of straight coolant and tops it off with water. Technician B fills the system with the correct mixture, tightens the radiator cap, and then checks for leaks. Who is correct? 2-While checking for conditions that might cause coolant electrolysis: Technician A places the positive lead of a voltmeter into the coolant and connects the negative lead to a ground. Technician B checks for the presence of voltage in the coolant with the ignition off. Who is correct? 3-Technician A says that if the PCV valve or connecting hoses become clogged, excessive pressure will develop in the crankcase and can cause oil leaks. Technician B says that if the PCV valve or connecting hoses become clogged, oil may be pushed into the air cleaner or cause it to be drawn into the intake manifold. Who is correct? 4-While bleeding air from a cooling system: Technician A loosens a heater hose at its highest…arrow_forwardWhich of the following statements best defines the term evacuation? A process in which the refrigerant in a system is released. A condition that exists when a compressor runs until there is no refrigerant left in the system. The process that pulls all traces of air and moisture from the system. A process that uses air to force moisture and dirt out of the system.arrow_forwardWhich of the following set entirely comprises a measurement system? A. Thermometer, odometer, ultrasonic sensor C. Espresso machine, light sensor, accelerometer B. Dish washer, espresso machine, thermometer D. Calculator, accelerometer, temperature sensorarrow_forward
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