Clearance tolerances are such that the ordinary clean refrigerant oil can be used satisfactorily in a vacuum pump.
Answer the following statement true (T) or false (F)
False
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The __________ on a typical conduit hand bender head is where you will place the middle bending mark when doing a three-point saddle bend.
a. arrow b. rim notch c. star point d. hook
One horsepower is the power required to move ________ pounds a distance of one foot in one second
A) 1 B) 33000 C) 550 D) None of these
Answer the following statement(s) true (T) or false (F)
1. Temporary currents flowing in the circuit until the overcurrent device opens are considered “objectionable” and are not permitted. 2. Due to data processing equipment being sensitive to electrical noise on the equipment grounding conductor, it is permitted to isolate the equipment from the “dirty ground” and connect the equipment to only a local ground rod. 3. Electrical systems that are permitted to be installed as ungrounded are usually not grounded so the first ground fault on the system will not result in operation of an overcurrent device. 4. The owner of the premises can choose whether the following circuits are grounded or remain ungrounded: a crane that operates over combustible fibers, circuits in inhalation anesthetizing locations of hospitals, and 15-volt circuits for swimming pool lighting derived from a transformer.
In the operation of the 555 timer, the trigger, pin #____, must be connected to a voltage less than one-third of Vcc to trigger the unit.
a. 2 b. 3 c. 4 d. 5