You need to de-energize a circuit to work on a unit. To insure your safety, you should:
A) Lock out and tag out the circuit.
B) Leave a clearly written message in 1" block letters "Keep Off."
C) Ask a friend to stand beside the disconnect switch to insure nobody turns it on.
D) Work quickly to reduce your exposure to the electricity.
A
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The current through an element is shown in Fig. 1.26. Determine the total charge that passed through the element at: (a) t = 1 s (b) t = 3 s (c) t = 5 s
 FIGURE 1.png)
The major electrical loads in an induced-draft hot surface ignition furnace are:
A) Igniter, flame sensor, and gas valve. B) Induced-draft blower, indoor fan motor, the gas valve, the igniter. C) Limit switch, fan switch, and door switch. D) Sequencer, heat strips, limit switch, and circuit breaker.
Which type of trailer floor design would be most suitable for use in a refrigerated trailer?
A. duct-type floor B. T-bar-type floor C. hybrid T-bar duct D. ship lapped, laminated oak
Which type of standard TTL circuit allows several devices to be connected to its output simultaneously?
A) a 7476 flip-flop B) a Schmitt trigger circuit C) a 7404 inverter D) No standard TTL circuit can do this.