2A672 Pre-test Edit Code 06

126 Questions | By Delgadoi | Updated: Mar 20, 2022 | Attempts: 611

Questions

Settings

Create your own Quiz

Questions and Answers

1.

(001) What is the simplest form of matter?
- A.
  
  Element
- B.
  
  Mixture
- C.
  
  Electrons
- D.
  
  Compund
2.

(001) In an atom, what electrons contain the most energy?
- A.
  
  The energy is shared equally by all electrons
- B.
  
  Orbiting electrons
- C.
  
  Valence electrons
- D.
  
  K shell electrons
3.

(001) If there are eight electrons in the outer most shell of an atom, then it is considered
- A.
  
  Complete
- B.
  
  Unstable
- C.
  
  Charged
- D.
  
  Stable
4.

(001) Atoms having more than four electrons, but less than eight are known as
- A.
  
  Insulators
- B.
  
  Conductors
- C.
  
  Stable atoms
- D.
  
  Semiconductors
5.

(001) The electrostatic fields around a positive ion move
- A.
  
  Inward
- B.
  
  Outward
- C.
  
  Inward, then outward
- D.
  
  Outward, then inward
6.

(001) The force required to move free electrons through a conductor is known as
- A.
  
  Current
- B.
  
  Voltage
- C.
  
  Negative charge
- D.
  
  Electrostatic force
7.

(002) What are factors that affect the resistance of a material?
- A.
  
  Area, weight, and state of material.
- B.
  
  Area, temperature, and type of material.
- C.
  
  Temperature, weight, and state of material.
- D.
  
  Temperature, type of material, and state of material.
8.

(002) What is the resistance in a circuit if the power rating is 40 watts and total current is 2 amps?
- A.
  
  40 ohms
- B.
  
  20 ohms
- C.
  
  10 ohms
- D.
  
  0.5 ohms
9.

002) In a series-parallel circuit, find RT (total resistance) if series resistor R1 = 7 ohms, and parallel resistors R2 and R3 = 8 ohms.
- A.
  
  23 ohms
- B.
  
  15 ohms
- C.
  
  11 ohms
- D.
  
  8 ohms
10.

(002) In a series-parallel circuit, the series current at I1 = 9 amps; in the two parallel branches, I2 = 5 amps; and the value of I3 is not listed. Use Ohm’s law to find the value of I3 and IT.
- A.
  
  I3 = 5 amps and IT = 14 amps.
- B.
  
  I3 = 4 amps and IT = 9 amps.
- C.
  
  I3 = 4 amps and IT = 18 amps.
- D.
  
  Not enough information to solve.
11.

(002) In a series-parallel circuit, total voltage is 12 volts, the value of E1 in the series portion of the circuit is unknown. There are two parallel branches (E2 = 3 volts) and the value of E3 in the second parallel branch is unknown. Using Ohm’s law, find the value of E1 and E3.
- A.
  
  E3 = 9 volts and E1 = 12 volts.
- B.
  
  E3 = 9 volts and E1 = 3 volts.
- C.
  
  E3 = 3 volts and E1 = 6 volts.
- D.
  
  E3 = 3 volts and E1 = 9 volts.
12.

(002) What is the difference between an open and a short?
- A.
  
  An open causes resistance to decrease; a short causes resistance to increase.
- B.
  
  Excessive current flow in an open circuit; no current flow in a shorted component.
- C.
  
  No current flow in an open circuit; excessive current flow in a shorted component.
- D.
  
  Minimum voltage development across the open component; maximum voltage development across the shorted component.
13.

(003) When voltage is induced into a conductor by a relative motion between the conductor and a magnetic field this principle is known as
- A.
  
  Magnetism
- B.
  
  Reluctance
- C.
  
  Direct current
- D.
  
  Electromagnetic induction
14.

(003) In an inductive circuit, what is meant by current lags voltage by 90 degrees?
- A.
  
  Current is zero when voltage is zero; voltage is maximum when current is maximum.
- B.
  
  Current is maximum when voltage is zero; voltage is maximum when current is zero.
- C.
  
  If current decreases, voltage aids the decrease.
- D.
  
  If current increases, voltage aids the increase.
15.

(004) What is the basic principle of operation for transformers?
- A.
  
  Mutual induction
- B.
  
  Magnetic induction
- C.
  
  Counterelectromotive force
- D.
  
  Primary and secondary induction
16.

(004) What transformer winding acts as a conductor and provides the path into which the voltage is induced?
- A.
  
  Field
- B.
  
  Primary
- C.
  
  Secondary
- D.
  
  Stationary
17.

(005) If the size of the plates of a capacitor is increased, how is capacitance affected?
- A.
  
  Capacitance increases.
- B.
  
  Capacitance decreases.
- C.
  
  Electrons are distorted and scattered.
- D.
  
  Electrostatic force between the plates decreases.
18.

(005) What statement best describes a capacitive circuit?
- A.
  
  Current leads applied voltage by 90 degrees.
- B.
  
  Applied voltage leads current by 90 degrees.
- C.
  
  Has the ability to conduct in one direction and not the other.
- D.
  
  Has the ability to conduct in all directions when gated or discharged.
19.

(005) In what type of circuit(s) does a capacitor oppose any change in voltage?
- A.
  
  Alternating current (AC) and direct current (DC).
- B.
  
  Pulsating DC
- C.
  
  Pure DC
- D.
  
  AC
20.

(006) What statement best describes a diode?
- A.
  
  Is a five-terminal device.
- B.
  
  Is a three-terminal device.
- C.
  
  Has the ability to conduct in one direction and not the other.
- D.
  
  Has the ability to conduct in all directions when gated or discharged.
21.

(006) What are the minority carriers in P-type material?
- A.
  
  Holes
- B.
  
  Protons
- C.
  
  Neutrons
- D.
  
  Electrons
22.

(007) The area of a semiconductor where P-type material is joined to N-type material is known as
- A.
  
  Dielectric region.
- B.
  
  Depletion region.
- C.
  
  Depletion field.
- D.
  
  PN region
23.

(007) A junction diode has how many PN junction(s)?
- A.
  
  1
- B.
  
  2
- C.
  
  3
- D.
  
  4
24.

(007) If a negative potential is connected to the cathode and a positive potential is connected to the anode of a PN junction, the diode is
- A.
  
  Not allowing current to flow
- B.
  
  Forward biased
- C.
  
  Reverse biased
- D.
  
  Turned on
25.

(008) In a circuit using a bridge rectifier, how many diodes are forward biased during the first cycle of alternating current (AC)?
- A.
  
  4
- B.
  
  3
- C.
  
  2
- D.
  
  1