Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 4, Problem 8RQ
To determine
The two factors that determine the setting of a dashpot timer.
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QUESTION 27
Pneumatic timers have better repeat accuracy that electronic timers.
True
False
QUESTION 25
Pneumatic timers use a diaphragm and operate on the principle of air displacement.
True
False
QUESTION 13
The symbol shown below represents a component which can fully control:
Single Acting Cylinder
Double Acting Cylinder
Both, Double Acting cylinder and single acting cylinder
O Non of the above
Chapter 4 Solutions
Understanding Motor Controls
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- Refer to the circuit shown in Figure 25–5. Assume that timer TR1 is set for a delay of 10 seconds and timer TR2 is set for a delay of 5 seconds. When the START button is pressed, the motor starts. After 10 seconds the S1 contacts open and the motor continues to accelerate, but never reaches full speed. After a delay of about 30 seconds, the motor trips out on overload. Which of the following could cause this problem? TR1 coil is open. S2 coil is open. S1 coil is open. R coil is open.arrow_forwardTo answer the following questions refer to the circuit shown in Figure 4114. Temperature switch TS1 is shown as: a. Normally open b. Normally closed c. Normally open held closed d. Normally closed held openarrow_forwardWhat two types of switches are normally found in the subbase of a low-voltage thermostat?arrow_forward
- Refer to the circuit shown in Figure 247. Assume that all timers are set for a delay of 5 seconds. When the START button is pressed the motor starts in its lowest speed. After a delay of over 10 seconds, the motor is still running in the lowest speed. Which of the following could cause the problem? a. TR1 coil is open. b. TR1 coil is shorted. c. S2 coil is open. d. S1 coil is shorted.arrow_forwardTo answer the following questions refer to the circuit in Figure 416. The pressure switch is shown as: a. Normally open b. Normally closed c. Normally open held closed d. Normally closed held openarrow_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
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