Necs Mock course 03001 test

In a thermoelectric generator, what is the name of the phenomenon where a temperature difference between two junctions produces voltage?

• Peltier effect

• Seebeck effect

• Thermo-couple effect

• Lenze's effect

During the charging process of a NiCd battery, what occurs at the positive electrode?

• Nickel hydroxide is reduced

• Nickel oxide is formed

• Cadmium is oxidized

• Cadmium oxidization is reduced

Which of the following is a method to produce EMF using electrostatics?

• Moving a magnet through a coil

• Charging a capacitor

• Heating a conductor

• Putting a solar panel in direct sunlight

Which of the following methods can be used to control the frequency of an AC generator?

Note a prime mover is also known as an engine.

• Changing the speed of the prime mover

• Using a rectifier

• Altering the generator's capacitance

• Using an inverter

In a primary cell, the cathode is typically made of:

• Carbon

• Copper

• Zinc

• Aluminum

What information does the third band on a resistor's color code typically indicates in a 4 band resistor?

• Multiplication factor

• Tolerance

• The colour of the resistor band

• The number digit

What type of current is generated by electromagnetic induction in a coil when exposed to a changing magnetic field?

• Direct Current (DC)

• Alternating Current (AC)

• Static Current

• Momentary Current

What does magnetic flux refer to?

• The density of magnetic lines of force

• The temperature of a magnet

• The amount of electric current

• The magnetic material

What are the primary components of the electrolyte in a lead-acid battery?

• Sulfuric acid and water

• Lithium hydroxide

• Copper Oxide

• Salt and water

Which of the following metals is commonly used as an anode in a galvanic cell?

• Zinc

• Copper

• Lithium

• Aluminum