The principle difference between a contactor and a motor starter is   ?  .

The minimum size copper equipment grounding conductor required for a branch circuit protected by a 100-ampere fuse is a   ?   AWG.

Luminaires (fixtures) shall be constructed, installed, or equipped with shades or guards so that combustible material will not be subjected to temperatures in excess of   ?  .

A   ?   is a reactor used to restrict the current to AC or DC drives in the case of short circuits in the drive itself.

Class 1, Class 2, and Class 3 circuits shall be identified at terminal and junction locations in a manner that prevents   ?   interference with other circuits during testing and servicing.

The fixed wiring methods in assembly occupancies shall be metal raceways, flexible metal raceways, nonmetallic raceways encased in not less than   ?   of concrete, Type MI, MC, or AC cable.

In general, where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the minimum branch-circuit conductor size, before the application of any adjustment or correction factors, shall have an allowable ampacity not less than the noncontinuous load plus   ?   of the continuous load.

Name three light activated devices used to receive light signals at the receiver.

For raceways containing conductors of 4 AWG or larger where splices or where angle or U pulls are made, the distance between each raceway entry inside the box and the opposite wall of the box shall not be less than   ?   times the trade size of the largest raceway in a row.

Conductors and cables in tunnel installations over 1000 volts, nominal, shall be located above the tunnel floor and so placed or guarded to protect them from   ?   damage.

The total force required in a torque application is comprised of two distinct regions. Name them.

Remote-control circuits for safety-control equipment shall be classified as Class 1 if the failure of the equipment to operate introduces a   ?   fire or life hazard.

Name the three terminals on a triac.

The maximum reverse bias voltage a diode can withstand is known as   ?  .

Autotransformer starters are best suited for what types of motors?

Cable trays and their associated fittings shall be   ?   for the intended use.

What are the different parts of a Silicon-Controlled Rectifier (SCR)?

What are pilot devices designed for?

In general, each 1,000-volt transformer, nominal, or less that has protection on the primary winding only, shall be protected by an individual overcurrent device on the primary side, rated or set at not more than   ?   of the rated primary current of the transformer.

What does this symbol mean?

If a control transformer secondary voltage is not grounded at the source, the   ?  .

How do you reverse direction of a 3-phase motor?

What does a Zener diode do?

Loss of a phase, overvoltage, undervoltage, and out of sequence (phase rotation) are conditions that can be detected by   ?   relays.

What is this tool?

The output section of an SSR performs as the _______ of an electromechanical relay.

Name three types of proximity sensors.

Equipment sealed against the entrance of an external atmosphere where the seal is made by fusion, for example, soldering, brazing, welding, or the fusion of glass to metal.

What is the most commonly used torque wrench?

Define the term "Authority Having Jurisdiction"

A variable frequency drive (VFD) provides a 60-hertz AC voltage to a 3-phase AC motor with four poles per phase. What would be the synchronous speed of the motor with this voltage applied?

Identify the connection type(s) on the buck-boost transformer.

Autotransformer starters are best suited for what types of motors?

In the event of a power interruption, emergency systems shall supply current in how many seconds?

Ground-fault circuit interrupter protection for personnel shall not be required for receptacles installed in those __________ (category 1) spaces whereto toilet and basin are installed within the patient room.

If 25A is measured on A phase of a delta connected transformer, what is the current through the A phase winding of the transformer?

If the selector switch is in the automatic position, at what temperature will the cooling motor starter MS1 be deenergized?