What is a proximity switch and how does it operate?
What will be an ideal response?
Proximity switches often limit motion and are often operated by the movement of a mechanical device. An example would be a switch that stops the motor
used for opening air inlet dampers once they have reached a full open position.
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Technician A says a typical V8 can be balanced in about 30 minutes. Technician B says in-line engines do not use bob weights. Who is correct?
A. Technician A B. Technician B C. Both technicians D. Neither technician
Which of the following is an NEC Article 427 requirement for the installation of electrical heat-tracing cables on pipe and vessels in unclassified areas?
a. The external surfaces of any equipment that operates at temperatures above 100°F (38°C) must be physically guarded, isolated, or thermally protected. b. Branch circuits and overcurrent devices supplying the equipment must be sized at no less than 100 percent of the total heater load. c. The heating cable cannot be allowed to make direct contact with the pipe or vessel. d. The presence of electric heating equipment must be identified using permanent caution signs or markings at the specified intervals.
Grapes are usually grown on trellises
Indicate whether the statement is true or false
A set of LT235/75R15 tires are removed from a pickup truck and replaced with LT255/75R15 tires. If the old gear had 20 teeth, how many should the gear have which will correct the speedometer error?
What will be an ideal response?