4Th Class Power Engineering Chapter 78

Front 1

E

I R equal to

Back 1

V

A R

Front 2

Current flow is:

1) Proportional to the resistance

2) Inversely proportional to the applied voltage

3) Increased by a decrease in applied voltage

4) Proportional to the applied voltage

5) Reversed by a resistance

Back 2

Proportional to the applied voltage

Front 3

The flow of electrons in a uniform direction is called:

1) Voltage drop

2) Electromotive force

3) Direct current

4) Electrical current flow

5) Potential difference

Back 3

Electrical current flow

Front 4

Current flow is inversely proportional to the:

1) Amperage

2) Resistance

3) Voltage

4) Wattage

5) Conductance

Back 4

Resistance

Front 5

If an electrical _____ is placed across a conductor, the electrons will drift from the negative end towards the positive end of the conductor, assuming the electron theory.

1) Current

2) Meter

3) Waire

4) Resistance

5) Potential

Back 5

Potential

Front 6

Three resistors of 20, 60 and 120 ohms are connected in parallel with a current flow of 60 amps. The applied voltage will be _____ volts.

1) 3.33

2) 800

3) 7 200

4) 12 000

5) 0.33

Back 6

800

Front 7

A triple pole single throw switch is one that:

1) Has three magnetic poles

2) Cannot operate manually

3) Is used for three phase circuits only

4) Requires three toggles

5) Opens and closes three wires of an electrical circuit

Back 7

Opens and closes three wires of an electrical circuit

Front 8

The equivalent resistance of three resistances of 10 ohms, 25 ohms and 50 ohms connected in parallel is _____ ohms.

1) 85

2) 6.25

3) 8.5

4) 0.16

5) 18.75

Back 8

6.25

Front 9

When a number of electrons pass a given point over a specific time period the energy may be referred to as:

1) An ampere

2) An ohm

3) Power or watts

4) Voltage

5) Electromotive force

Back 9

An ampere

Front 10

The purpose of having an upward movement of a switch handle to close the switch is:

1) Because it is easier to operate when opening the switch

2) To have the handle out of the way

3) To prevent the switch from closing due to gravity

4) It indicates the condition of the circuit

5) To meet the requirements of the electrical act

Back 10

To prevent the switch from closing due to gravity

Front 11

In an atom, the electrons:

1) Are large in size when compared to the protons

2) Orbit around each other

3) Orbit only the neutrons

4) Are attracted to the protons

5) Are repelled by the neutrons

Back 11

Are attracted to the protons

Front 12

A conductor's resistance is inversely proportional to its:

1) Voltage

2) Wattage

3) Insulation covering

4) Length

5) Cross-sectional area

Back 12

Cross-sectional area

Front 13

Voltage is:

1) The rate of electron flow

2) The rate of ohm flow

3) The rate of current flow

4) Required for current resistance

5) Electromotive force

Back 13

Electromotive force

Front 14

Atoms that have greater numbers of electrons in the outer shell are:

1) Good conductors

2) Not good conductors

3) Positively charged

4) Neutrally charged

5) Not good insulators

Back 14

Not good conductors

Front 15

The electrical pressure that causes current flow through a circuit is:

1) The ohm

2) The watt

3) Amperage

4) Very high voltage

5) Electromotive force

Back 15

Electromotive force

Front 16

Electrical power can be determined by the formula:

1) R = E x I

2) E = I x R

3) P = E x I

4) I = E x R

5) P = I x R

Back 16

P = E x I