Final Competition Review Pt. 2

What are the two main operating functions of a transistor?

• To rectify or amplify electrical signals

• To amplify or switch electrical signals

• To protect or rectify electrical signals

• To amplify or protect electrical signals

What are the two main operating functions of a transistor?

• To rectify or amplify electrical signals

• To amplify or switch electrical signals

• To protect or rectify electrical signals

• To amplify or protect electrical signals

MCC's often use __________ and __________ transformers to meter and condition voltage and current levels.

• buck / boost

• control / current

• differential / auto

• potential / current

 ?   latching relays have a latch coil and an unlatch coil.

• Magnetic

• Impulse

• Mechanical

• Pneumatic

All boxes and enclosures for emergency circuits shall be permanently marked so they will be __________ as a component of an emergency circuit or system.

• easily recognizable

• readily identified

• sufficiently evaluated

• uniquely distinguishable

What type of transformer has an electrical connection between the primary winding and the secondary winding?

• Delta-connected transformer

• Potential transformer

• Wye-connected transformer

• Autotransformer

Ground-fault protection of equipment shall be provided for solidly grounded   ?   electrical services of more than 150 volts to ground but not exceeding 1,000 volts phase-to-phase for each service disconnect rated 1,000 amperes or more.

• delta

• industrial

• non-dwelling unit

• wye

How much voltage is needed for a silicon diode to start conducting when forward-biased?

• 0.2 V

• 0.4 V

• 0.7 V

• 1.2 V

The converter section of the VFD uses a __________ to convert the incoming AC to a pulsing DC

• full-wave bridge rectifier

• half-wave bridge rectifier

• inductor

• transformer

In general, each 1000 volt transformer, nominal, or less, that serve as 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.

• 100%

• 250%

• 173%

• 125%