Ch 3 & 4

Question 1

3 major Battery Hazards?

Answer 1

Burns
Electrical Shock
Explosive Gas

Question 2

5 battery safety precautions?

Answer 2

Vent fans in battery bank
Operators alert
No open flames 
Shower or eyewash available 
Protective Clothing

Question 3

Conductor loop turning in a magnetic field cutting across magnetic lines of force.

Answer 3

Simple Generator

Question 4

Result of one side of the generator loop cutting across the lines of force in one direction and the other side of the loop in the opposite direction.

1st half turn = positive voltage
2nd half turn = negative voltage

One whole turn is AC generation

Answer 4

Sine-wave Output

Question 5

Component used to drive AC generator.

Answer 5

Prime Mover

Question 6

Rotating part Of AC generator that is driven by the prime mover.

Answer 6

Rotor

Question 7

Stationary part of AC generator

Answer 7

Stator

Question 8

Electrical connections used to transfer power to/from the rotor of an AC generator.

Answer 8

Slip Rings and Brushes

Question 9

Controls the field current to regulate output voltage from generator.

Answer 9

Voltage Regulator

Question 10

Number of cycles of an AC voltage/current that occur in 1 second.

Measured in Hertz Hz

Answer 10

Frequency

Question 11

Amount of time it takes to complete one cycle.

Answer 11

Period

Question 12

Amount of AC that produces same heating effect as an equal amount of DC.

Answer 12

Effective Value of AC

Question 13

A 3-phase waveform consists of…

Answer 13

3 single phase sine-waves, equal in magnitude and 120 degrees apart.

Question 14

Why are 3 phase power systems used?

Answer 14

3 phase circuits weigh less than single phase circuits.

Wide range of voltages and can be used for single phase loads.

3 phase equipment is smaller, weighs less and is more efficient than single phase.

Question 15

Developed through interactions with rotor and rotating magnetic field.

Answer 15

Torque in AC Motor

Question 16

Slip increases from 0 to 10%, torque increases linearly. Torque will reach a max value at 25% slip. If passed it will stall.

Answer 16

AC Induction Motor

Question 17

Starting Current in AC motor: current caused by what?

Answer 17

Power required to build up rotating field in the motor.

Interactions between rotor currents and stator magnetic fields.

Extra energy required to overcome inertia of machine.

Question 18

Motor current during operation varies directly with what?

Answer 18

Motor Load

Question 19

Chemical/voltaic cell has two electrodes of different types of metals and an electrolyte solution.

Answer 19

Battery

Question 20

Electrical conductors that are used to make contact w nonmetallic part of a circuit.

Answer 20

Electrodes

Question 21

Consists of two or more chemical voltaic cells connected together.

Answer 21

Battery

Question 22

Ratio comparing weight of any liquid to the weight of an equal volume of water.

Answer 22

Specific Gravity

Question 23

Specific gravity for this in a battery is 1.275

Answer 23

Electrolyte

Question 24

Current of 1 ampere flowing for 1 hour

Answer 24

Ampere-hour

Question 25

Difference between synchronous speed and rotor speed.

Answer 25

Slip

Question 26

Converts chemical energy to electrical energy.

Answer 26

Battery

Question 27

Magnetic Induction - Holy Trinity

Answer 27

Conductor, magnetic field, movement.

Question 28

What goes up when charging a battery, down when discharging?

Answer 28

Specific gravity and voltage

Question 29

Sine Wave Values

Answer 29

Peak value - highest pt
Effective value - peak value x .707
Instantaneous Value - Current value

Question 30

Consists of conductors within generator that receive voltage from a DC source and produce mag flux.

Answer 30

Field

Question 31

The part of the AC generator that produces voltage.

Answer 31

Armature

Question 32

Conductor carrying current in a magnetic field.

Answer 32

Torque