2A652 CDC Pretest Volume 2

56 Questions | By 19hmm92 | Updated: Mar 22, 2022 | Attempts: 242

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1.

Every atom must contain what types of particles?
- A.
  
  Electrons and protons
- B.
  
  Electrons and neutrons
- C.
  
  Protons and neutrons
- D.
  
  Electrons, protons, and neurons
2.

An atom with eight electrons in its outermost shell is said to be
- A.
  
  Free
- B.
  
  Stable
- C.
  
  Valence
- D.
  
  Ionized
3.

How many valence electrons are needed to make a good conductor?
- A.
  
  3
- B.
  
  4
- C.
  
  5
- D.
  
  6
4.

"Dielectric" is the term used for
- A.
  
  Conductors
- B.
  
  Insulators
- C.
  
  Doped atoms
- D.
  
  Semi-conductors
5.

"The flow or drift of electrons through a conductor" in the same direction at the same time is the definition of
- A.
  
  Conductivity
- B.
  
  Voltage
- C.
  
  Current
- D.
  
  Valance
6.

The potential difference between two points in a circuit that exerts a force on free electons is called
- A.
  
  Conductivity
- B.
  
  Voltage
- C.
  
  Current
- D.
  
  Valence
7.

What is used to control current flow in a circuit?
- A.
  
  Voltage
- B.
  
  Coulombs
- C.
  
  Resistance
- D.
  
  Conductivity
8.

The relationship of voltage, current, and resistance is expressed through
- A.
  
  E,I, and C
- B.
  
  Power formulas
- C.
  
  Conductance
- D.
  
  Ohm's Law
9.

Total current in a series circuit is equal to the
- A.
  
  Current through one component
- B.
  
  Sum of the current through each component
- C.
  
  Reciprocal of the current through each component
- D.
  
  Reciprocal of the sum of the currents through each component
10.

What is the wattage of a circuit with 28 volts applied and a total resistance of .2 ohms?
- A.
  
  .14 watts (w)
- B.
  
  .14 kilowatts (kw)
- C.
  
  3.92 w
- D.
  
  3.92 kw
11.

In a parallel circuit, the total voltage is equal to the
- A.
  
  Sum of the voltages across each branch
- B.
  
  Voltage across each resistor
- C.
  
  Voltage across each branch
- D.
  
  The reciprocal of the voltage across the resistances
12.

Source current in a parallel circuit will be divided according to branch
- A.
  
  Voltage
- B.
  
  Powers
- C.
  
  Lengths
- D.
  
  Resistances
13.

The areas around a magnet where its influence can be felt is the definition of the
- A.
  
  Saturation principle
- B.
  
  Magnetic theory
- C.
  
  Magnetic field
- D.
  
  Law of attraction and repulsion
14.

"The ability of a material to pass lines of force" is a definition of
- A.
  
  Permeability
- B.
  
  Reluctance
- C.
  
  Electromagnetism
- D.
  
  Retentivity
15.

The magnetism that remains after the magnetizing force has been removed is known as
- A.
  
  Electromagnetism
- B.
  
  Molecular magnetism
- C.
  
  Permeability
- D.
  
  Residual magnetism
16.

The magnetic field of an electromagnet can be varied by changing the
- A.
  
  Type of core
- B.
  
  Number of turns in the coil
- C.
  
  Amount of current throught the coil
- D.
  
  All of the above
17.

The electromechanical generation of a voltage requires a magnetic field, relative motion, and
- A.
  
  A complete circuit
- B.
  
  A conductor
- C.
  
  An insulator
- D.
  
  A load
18.

The principle behind all electromechanical generation is
- A.
  
  Conduction
- B.
  
  Commutation
- C.
  
  Rectification
- D.
  
  Electromagnetic induction
19.

The function of the commutator in a DC generator is to
- A.
  
  Complete the circuit to the load
- B.
  
  Induce DC into the external circuit
- C.
  
  Rectify the input
- D.
  
  Change AC voltage to DC voltage
20.

Because an inductor stores energy and then returns it to the circuit, it is called a
- A.
  
  Resistive device
- B.
  
  Reactive device
- C.
  
  Retentive device
- D.
  
  Retroactive device
21.

An inductor stores enegy in the form of
- A.
  
  Heat
- B.
  
  Resistance
- C.
  
  A magnetic field
- D.
  
  An electrostatic field
22.

The process by which a current change in one coil produces a voltage in another coil is called
- A.
  
  Inductance
- B.
  
  Self-induction
- C.
  
  Mutual induction
- D.
  
  None of the above
23.

A transformer will change all of the following except
- A.
  
  Power
- B.
  
  Current
- C.
  
  Voltage
- D.
  
  Resistance
24.

Normally, the winding of a transformer that is connected to a power source is known as the
- A.
  
  Field winding
- B.
  
  Primary winding
- C.
  
  Current winding
- D.
  
  Secindary winding
25.

What kind of turns of wire is found in the secondary windings of a step up transformer?
- A.
  
  Equal
- B.
  
  Less
- C.
  
  More
- D.
  
  All of the above