Deck 41: Electrical Equipment and Systems

Question 1

____ is the use of light from the sun and sky to complement or replace electric light.

A) Task lighting
B) General illumination
C) Reflection
D) Daylighting

Answer 1

D

Question 2

Describe LEDs.

Answer 2

Light Emitting Diodes (LED) are small light bulbs based on semiconductor technology. The electrons of a semiconductor diode are brought from a state of high energy to a state of low energy with the energy difference being emitted in the form of light. Until recently, LEDs were used only in single-bulb applications, such as in instrument panels and electronics. Today, LED bulbs are made by clustering many small bulbs encased in diffuser lenses that spread light in wider beams. Bulbs are available with standard bases to fit common household light fixtures.

Question 3

Describe circuit breakers.

Answer 3

Circuit breakers are electromechanical units that automatically disconnect a circuit when the current attains an established value that would cause overheating or a possible fire in the circuit. Examples of occurrences that could cause a circuit breaker to open are excess current flow caused by overloading or a short in the circuit. Circuit breakers are available in a molded case inserted in the circuit at the panel or a large air-type breaker not in a protective case. When a circuit breaker opens a circuit, the breaker is reset by moving the switch handle after the deficiency has been corrected.

Question 4

____ is/are a form of closed raceway that supports insulated electric wire and provides protection.

A) Conduit
B) Cable trays
C) Busways
D) Cable lines

Question 5

What are motor control centers?

Question 6

How is illuminance measured?

Question 7

What are Type SNM cables?

Question 8

Describe circuit breaker connections on a typical panelboard.

Question 9

A(n) ____ is a unit of the rate of flow of electric current.

A) ampere
B) ohm
C) volt
D) force

Question 10

Electric power is generated by ____, which use the energy of falling water to turn a generator and produce electricity.

A) nuclear power plants
B) hydroelectric generation plants
C) fossil fuel powered generators
D) on-site powered generators

Question 11

Describe PV Grid-Connected Systems.

Question 12

Type ____ conductors are mineral insulated and sheathed in a gas-tight and watertight metal tube.

A) UF
B) AC
C) NMC
D) MI

Question 13

____ is the use of a heat engine or power station to simultaneously generate both electricity and useful heat.

A) Regeneration
B) Heat salvaging
C) Cogeneration
D) Turbine driving

Question 14

____ cartridge fuses are rated from 10A to 60A and are generally used to protect currents for individual appliances, such as an electric stove.

A) Plug
B) Knife-blade
C) Ferrule type
D) Switchgear

Question 15

Describe the various electrical codes.

Question 16

What is glare?

Question 17

Describe the electrical load requirements for different types of buildings.

Question 18

A ____ action is used to control a unit, such as a light, from two locations.

A) double-pole, single-throw
B) single-pole, double-throw
C) double-pole, double-throw
D) single-pole, single-throw

Question 19

____ lamps have a long glass tube sealed at each end.

A) Fluorescent
B) Tungsten-halogen
C) High-intensity discharge
D) Mercury vapor lamps

Question 20

____ lighting systems project most of their light down, with only a very small percentage projecting upward to light the ceiling.

A) General-diffuse
B) Indirect
C) Semi-indirect
D) Semi-direct