General A > Electrical > Flashcards

Electrical Flashcards

(48 cards)

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1
Q

One horsepower is equivalent to:

A

746 watts

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2
Q

One horsepower is the unit of work required to lift——-ponds one foot in one minute:

A

33,000

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3
Q

Ohm’s Law

A

I=E/R
R=E/I
E=IR

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4
Q

A110 watt lamp is connected to a 220 V line. When the power is on, what is the effective resistance in ohms?

A

440 ohms
R=E2 / P
(220)2 / 110 W=440 ohms

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5
Q

One of the ways to measure electrical current is with a

A

Ammeter

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6
Q

Which instrument would you use for checking continuity in a conductor?

A

Ohmmeter

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7
Q

What wire sizes has the least resistance?

A

00 gage

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8
Q

The higher the ——value, the greater the resistance to the flow of heat.

A

R

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9
Q

What type of system does the formula “KVA=AMPSxVOLTSx SQUARE ROOT OF 3 inches represent?

A

3-phase balanced

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10
Q

Which of the following materials does not resist corrosion?

A

Copper

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11
Q

One horsepower equals —-foot - pounds of torque per second.

A

33,000
- 1 Ho= 550 feet-pounds/second= 33,000 feet-pounds/ minutes.

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12
Q

Which of the following meters must not be set up in direct contact with electrical current?

A

Ohmmeter
- An ohmmeter uses internal current supplied by a battery. Connecting it to a live circuit could destroy it.

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13
Q

What is a coil?

A

-Inductor
Induction is the creation of an electric charge or a magnetic field by the nearness of an electrified source, a magnetic or a magnetic field.

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14
Q

A unit that connects two circuits together is called a:

A

Relay
More correctly, a relay is a device in which one electric circuit affects operation of another.

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15
Q

An “ R-value” is used to denote the passage of ——– through a wall.

A

Heat

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16
Q

Smallest conductor size used for general wiring.

A

No.14

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17
Q

The black wire in an air conditioning circuit is the:

A

Power lead

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18
Q

You would put a fuse or circuit breaker in the side of a circuit having:

A

Black wire

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19
Q

What is the color of the wire going to the ground?

A

Green

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20
Q

What size conductor must be used for a tracer wire on underground plastic gas lines?

Study These Flashcards
A

No.18
-All underground non metallic piping must have a yellow, 18 gage insulated wire attached to it and the wire must terminate above the ground at both ends.

21
Q

In the formula X= HP / 746
X represent?

Study These Flashcards
A

Watts
1 horsepower= 746 watts
Watts= HP / 746

22
Q

Piers of a bridge bring its structural strength down to:

Study These Flashcards
A

Bell caissons

-It creates a greater bearing area at the base of the caisson.

23
Q

Which of the following is the best practice regarding monolithic pours for dams?

Study These Flashcards
A

Use Type - IV Portland cement
-Type IV cement generates less heat during hydration and curing than ordinary Type I Portland cement.

24
Q

What is the name of the equipment used for transmission of electricity from exterior lines to interior wiring?

Study These Flashcards
A

Service box
- The service box includes a circuit breaker which can be used to shut off all the power in the house or a switch with a handle located on the outside and the service fuses inside.
-The cover on the service box is often sealed by the utility.

25
The formula "A=0.785d2" refers to (an):
Circle -Area of a Circle: A=(3.14/4)x d2=0.785xd2
26
What is the first thing you should do before removing a contractor?
Disconnect the power supply
27
What type of fire extinguisher would you use to extinguish an electrical fire?
Carbon dioxide - Carbon dioxide extinguishers work by dispersing oxygen and the best used for electrical fire.
28
What instrument do you use to measure true power?
Wattmeter -The Wattmeter it is a measure of true power because it is a combination of an ammeter and a voltmeter. It measures both voltage and current and determines the resultant power.
29
One horsepower is equivalent to:
746 Watts - 1 hours power is the amount of power used by a lift a 550 pounds heavy object from a depth of 1 foot in one second. This power when converted to SI system gives.
30
One horsepower is the unit of work required to lift — pounds one foot in one minute:
33,000 - By definition 1 horsepower (HP) is equal to 33,000 foot- pounds of work per minute.
31
Which is an incorrect statement of Ohm's Law?
I= E/R R=E/I E=IR
32
A 110 watt lamp is connected to a 220 V line. When the power is on, what is the effective resistance in ohms?
440 E= IR & P= EI then P= I 110/220=0.5 220/.5=440 ohms= R
33
One of the ways to measure electrical current is with a(n):
Ammeter - Ammeter is an instrument used for measuring electrical current in a circuit. Ammeters work to measure electrical current by measuring the current through a set of coils with a very low resistance and indicative reactance
34
Which instrument would you use for checking continuity in a conductor?
Ohmmeter - to check the continuity of a conductor, you would use an ohmmeter. An ohmmeter is the instrument specifically designed to measure electrical resistance in circuits or components - An ohmmeter is the right tool for checking continuity in a conductor. It measures electrical resistance which is the opposite offered by a circuit or component to the flow of electric current.
35
Which of the following wire sizes has the least resistance?
00 gage - AWG#00 has a diameter size of 0.3648 inches
36
What type of system does the formula "KVA=AMPS x VOLTS x Square root of 3" represents?
3- phase balance - 3 phase balance establishes worst case scenarios for system stress.
37
One hourspower equals ____ foot pound of torque per second.
33,000 - 1 hp=-0.746 kW 550 feet- pounds/second= 33,000 feet-pounds/minute
38
Meters must not be set up in direct contact with electrical current?
Ohmmeter - An ohmmeter uses internal current supplied by a battery. Connected it to a live circuit could destroy it.
39
What is a coil?
Inductor - Induction is the creation of an electric charge or a magnetic field by the nearness of an electrified source a magnet or a magnetic field.
40
What is cool?
Inductor
41
A unit that connects two circuits together is called a:
Relay -More currently a relay is a device in which one electric circuit affects the operation of another.
42
How many feet may a worker be from an overhead high voltage line?
6 feet
43
What is the smallest conductor size used for general wiring?
No.14 - #14?is the minimum size wire to be used when wiring branch circuit .
44
You would put a fuse or circuit breaker in the side of. Circuiohaving the:
Black wire - Fuse go on the black wire side in order to serve as a circuit protector interrupting the circuit and preventing damage to the system - Black: hot - White: neutral - Green/ bare= ground
45
What size conductor must be used for a tracer wire on underground plastic gas lines?
No.18 - All underground non metallic pipe must have a yellow, 18 gage insulated wire attached to it and the wire must terminate above the ground at both ends. This wire is used to locate the plastic piping and prevent damage if excavation is planned in the area. To locate the plastic piping, an instrument is attached to the tracer wire and a metallic locator is then able to locate the wire and thus the pipe.
46
The following equation applies to what type of electric motor? P=( E x I x 1.73x power factor) / 1000
P= ( E x I X 1.73 x power factor) /1000 Is used to calculate the power in a three phase AC electric motor. (E) represents the voltage (I) represents the current Factor 1.73 ( which is the square root of 3) is used because it accounts for the three phases power system.
47
In the formula X= HO / 746, X represents:
Watts 1 horsepower = 746 watts Watts= HP / 746
48
Instrument to measure true power?
Wattmeter
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