2A672 2013 Vol 1 Electrons
Practice test volume 1
- 1.What is the simplest form of matter?
- A.
Element
- B.
Mixture
- C.
Electrons
- D.
Compound
- 2.In an atom what electrons contain the most energy?
- A.
The energy is shared equaly by all electrons
- B.
Orbiting electrons
- C.
Valence electrons
- D.
K shell electrons
- 3.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.Atoms having more than four electrons , but less than eight are know as
- A.
Insulators
- B.
Conductors
- C.
Stable atoms
- D.
Semiconductor
- 5.The electrostatic fields around a positive ion move
- A.
Inward
- B.
Outward
- C.
Inward, then outward
- D.
Outward, then inward
- 6.The force required to move free electrons through a conductor is known as
- A.
Current
- B.
Voltage
- C.
Negative charge
- D.
Electrostatic force
- 7.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.What is the resistance in a circuit if the power rating is 40 watts and the total current is 2 amps
- A.
40 ohms
- B.
20 ohms
- C.
10 ohms
- D.
0.5 ohms
- 9.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.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 ohms 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.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 is unknown. using ohms 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.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.When voltage is induced by a relative motion between the conductor and a magnetic field this principle is know as
- A.
Magnetism
- B.
Reluctance
- C.
Direct current
- D.
Electromagnetic induction
- 14.In am 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 increases
- 15.What is the basic principle of operation for transformers
- A.
Mutual induction
- B.
Magnetic induction
- C.
Counter electromotive force
- D.
Primary and secondary induction
- 16.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.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.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.In what type of circuit(s) does a capacitor oppose any change in voltage
- A.
AC and DC
- B.
Pulsating DC
- C.
Pure DC
- D.
AC
- 20.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.What are the minority carriers in a p-type material?
- A.
Holes
- B.
Protons
- C.
Neutrons
- D.
Electrons
- 22.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.A junction diode has how many pn junctions
- A.
1
- B.
2
- C.
3
- D.
4
- 24.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.In a circuit using a bridge rectifier how many diodes a forward biased during the first cycle of alternation current (AC)
- A.
4
- B.
3
- C.
2
- D.
1
Questions: 80 | Attempts: 2628 | Last updated: Jun 13, 2018
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