Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 4, Problem 6RQ
To determine
Identify the two sections of an overload relay.
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What is the Relay Number and its law?
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…
Draw a series circuit with a thermostat,a low-pressure switch, and a highpressure switch used as safety controlsto protect a motor
Chapter 4 Solutions
Understanding Motor Controls
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- How many transformers are needed to make an open-delta connection?arrow_forwardThe large interconnecting line between the indoor and outdoor coil is the _____line.arrow_forwardRefer to Figure 211 to answer the following questions. How much voltage will be applied to coil 1CR when it is energized?arrow_forward
- Explain the operation of an on-delay relay.arrow_forwardWhy is it necessary to permit a solder melting type of overload relay to cool for two to three minutes after it has tripped?arrow_forwardAn 11-pin control relay contains three sets of single-pole double throw contacts. List the pin numbers by pairs that can be used as normally open contacts.arrow_forward
- A wye-connected load has a phase current of 25 A. How much current is flowing through the lines supplying the load?arrow_forwardRefer to the schematic in Figure 7-10. Assume that when the START button is pressed, the control transformer fuse blows. What is the most likely cause of this trouble? Figure 7-10 Numbers are placed beside all components.arrow_forwardA delta connection has 30 A of current flowing through each phase winding. How much current is flowing through each of the lines supplying power to the load?arrow_forward
- When using a rod type float switch, how is the amount float movement required to open or close the contacts adjusted?arrow_forwardIs the resistance in the start winding greater or less than the resistance in the run winding?arrow_forwardAn open winding in an electric motor means that A. the winding is making contact with the motor frame. B. one winding is making contact with another winding. C. a wire in one winding is broken. D. the centrifugal switch to the start winding is open.arrow_forward
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