Electricity for Refrigeration, Heating, and Air Conditioning
9th Edition
ISBN: 9781285179988
Author: Russell E. Smith
Publisher: Cengage Learning
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Select the proper choice(s) for each of the following statements:
1) To control single-acting cylinder we just need:
double-acting cylinder we should use
A2/2-way, 5/2-way,
(C) 3/3-way, 3/4-way,
2) In
DCV.
(B) 3/2-way, 4/2-way,
(D) 4/3-way, 3/2-way.
mid poistion of DCV, we can move cylinder piston rod freely without
resistance by hand.
(A) working ports are exhausted,
(C) working ports are pressurized,
3) In pneumatics we use
A Compressor
(B) Pump,
DCV, while to control the
4) Quick exhaust valve is used to
(A) increase the cylinder return speed.
(C) meter-out the cylinder speed
(B) all ports are closed.
no one of these options.
to obtain high pressure air.
(C) Turbine,
(D) pressure relief valve.
(B) meter-in the cylinder speed,
(D) increase the cylinder extending speed.
6) Meter-in of cylinder movement is used to control the
Afluid that enters the hydraulic cylinder,
(B) fluid that exits the hydraulic cylinder,
(C) fluid that enters the DCV
(D) fluid that exits the DCV.
5) One of the…
All terminals have a defined wire size range. If I had a wire of 2.0mm / 15 AWG, what terminal should I use?
A. Red insulated terminal.
B. Blue insulated terminal.
C. Yellow insulated terminal.
D. It doesn’t matter as all these answers are correct.
What happens when the low-voltage current flow in the coil primary winding is interrupted by the switching device?
The primary winding delivers a high-voltage spark to the plugs.
The magnetic field in the coil primary builds.
The secondary voltage drops to zero volts.
High voltage is induced in the secondary windin
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Electricity for Refrigeration, Heating, and Air Conditioning
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- The diagram shows a brass rod and an iron rod beside each other at the bottom of a rectangular coil. What happens when a d.c. current passes through the coil? to d.c. supply rectangular coil brass iron rod rod Only the brass rod is magnetized Only the iron rod is magnetized The two rods attract each óther The two rods repel each other.arrow_forward15. When you measure the voltage drop across a set of contacts, you're O A. measuring the equivalent motor resistance. B. sensing how much current is flowing in the circuit. O C. checking the incoming voltages. O D. checking the quality of the contact set.arrow_forwardA load is an electrical device that__________.a. produces electricityb. directs the flow of electricityc. assists in the starting of motorsd. uses electricity to do useful workarrow_forward
- In relation to the circuit presented below, mark the alternative(s) that you consider correct. 1 To enable actuator A2 to advance, it is necessary to switch valve V2 to the leftmost position and ensure that valve V1 is in its initial (intermediate) position. 2 Switching valve V2 to the leftmost position allows actuator A2 to advance, but for this to happen, valve V1 must also be switched to the leftmost position. 3 When activating valve V1, using the locking lever installed on the left side of it, the two actuators (A1 and A2) are allowed to advance. 4 Hydraulic pump B1 is a simple variable displacement type. 5 Valves V1 and V2 have a TANDEM center.arrow_forwardName two requirements that must be met before a motor can be used for wye-delta starting.arrow_forwardHelp me solve this question ASAP !!arrow_forward
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