4.A. What type of seal system is constructed of a hard brittle material and is often used in a pump to seal between the pump and the motor? A. Steel B. Ceramic C. Glass

Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter16: Advanced Automatic Controls-direct Digital Controls (ddcs) And Pneumatics
Section: Chapter Questions
Problem 1RQ: True or False: Pneumatic controls are explosion-proof.
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14.A. What type of seal system is constructed of a hard brittle material and is often used in a pump to seal
between the pump and the motor?
A. Steel
B. Ceramic
C. Glass

14.B. When a pneumatic solenoid fails, the failure is normally due to a
A. weak pilot.
B. bad spool.
C. ripped seal.

14.C. When you're dealing with a PM task for a drive-belt form of conveyor, and you must make tracking
adjustments to the belt, you should
A. pull the belt back with pliers or a belt puller and see if it returns to the previous tracking marks.

B. perform tracking adjustments at both ends of the belt.
C. make a small adjustment, then continue with small adjustments as needed.

 

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