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
Correct Answer
A. Element -
- 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
Correct Answer
C. Valence 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
Correct Answer
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
Correct Answer
A. Insulators -
- 5.
The electrostatic fields around a positive ion move
- A.
Inward
- B.
Outward
- C.
Inward, then outward
- D.
Outward, then inward
Correct Answer
B. Outward -
- 6.
The force required to move free electrons through a conductor is known as
- A.
Current
- B.
Voltage
- C.
Negative charge
- D.
Electrostatic force
Correct Answer
B. Voltage -
- 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
Correct Answer
B. Area, temperature, and type 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
Correct Answer
B. 20 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
Correct Answer
C. 11 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
Correct Answer
B. I3= 4 amps and IT= 9 amps -
- 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
Correct Answer
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
Correct Answer
C. No current flow in an open circuit; excessive current flow in a 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
Correct Answer
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
Correct Answer
B. Current is maximum when voltage is zero; voltage is maximum when current is zero -
- 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
Correct Answer
A. Mutual 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
Correct Answer
C. Secondary -
- 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
Correct Answer
A. Capacitance increases -
- 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
Correct Answer
A. Current leads applied voltage by 90 degrees -
- 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
Correct Answer
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
Correct Answer
C. Has the ability to conduct in one direction and not the other -
- 21.
What are the minority carriers in a p-type material?
- A.
Holes
- B.
Protons
- C.
Neutrons
- D.
Electrons
Correct Answer
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
Correct Answer
B. Depletion region -
- 23.
A junction diode has how many pn junctions
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
A. 1 -
- 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
Correct Answer
B. Forward biased -
- 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
Correct Answer
C. 2 -
- 26.
How is a zener diode connected in a circuit to regulate voltage?
- A.
In parellel to the load
- B.
In series with the load
- C.
In parellel to the resistor
- D.
In series with the resistor
Correct Answer
A. In parellel to the load -
- 27.
How is a zener diode connected in a circuit to protect the load?
- A.
In parellel to the resistor
- B.
In series with the load
- C.
In parallel to the load
- D.
Forward biased
Correct Answer
B. In series with the load -
- 28.
What is the primary use of silicon-controlled rectifier (SCR)
- A.
Electronic switch
- B.
Voltage regulator
- C.
Circuit amplifier
- D.
Spike protector
Correct Answer
A. Electronic switch -
- 29.
The silicon-controlled rectifier (SCR) has how many layers?
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
D. 4 -
- 30.
In order to turn off a silcon-controlled rectifier (SCR) the current must drop below the
- A.
Trigger current
- B.
Holding current
- C.
Variable current
- D.
Breakdown current
Correct Answer
B. Holding current -
- 31.
What is the major difference between an NPN transistor and a PNP transistor?
- A.
A PNP transistor can only be used as a regulator
- B.
An NPN transistor can only be used as a switch
- C.
Direction of current flow
- D.
Number of junctions
Correct Answer
C. Direction of current flow -
- 32.
If the arrow in a bipolar transistor is pointing away from the base, what type of transistor is it?
- A.
N-type
- B.
P-type
- C.
NPN
- D.
PNP
Correct Answer
C. NPN -
- 33.
The most positive point in a PNP bipolar transistor is the
- A.
Load circuit
- B.
Collector
- C.
Emitter
- D.
Base
Correct Answer
C. Emitter -
- 34.
The circuit in the bipolar transistor that carries 5 percent of the current flow is the
- A.
Base circuit
- B.
Load circuit
- C.
Control circuit
- D.
Emitter-collector circuit
Correct Answer
C. Control circuit -
- 35.
What happens if the emitter-base (E-B) current is increased in a transistor amplifier
- A.
Resistance decreases and current through the load circuit decreases
- B.
Current decreases through the emitter collector (E-C) circuit
- C.
Resistance increases and current flow decreases
- D.
Current increases through the E-C circuit
Correct Answer
D. Current increases through the E-C circuit -
- 36.
What are the three leads in a unijunction transistor (UJT) called
- A.
Anode, cathode, and gate
- B.
Emitter, base 1 and base 2
- C.
Emitter collector and base
- D.
Common emitter common collector and common base
Correct Answer
B. Emitter, base 1 and base 2 -
- 37.
The emitter in a unijunction transistor always points towards the
- A.
Base 1 lead
- B.
Collector
- C.
Emitter
- D.
Gate
Correct Answer
A. Base 1 lead -
- 38.
What controls the firing time of the unijunction transistor?
- A.
Intrinsic standoff ratio
- B.
Resistance in the circuit
- C.
Capacitance in the circuit
- D.
Resistance and capacitance in the circuit
Correct Answer
D. Resistance and capacitance in the circuit -
- 39.
A metal oxide varistor (MOV) is made up of how many semiconductors
- A.
2
- B.
3
- C.
4
- D.
5
Correct Answer
A. 2 -
- 40.
What component of the voltage regulator compensates for loses in the power cable by sensing changes in the current flow?
- A.
Load rheostat
- B.
No load rheostat
- C.
Line drop switch
- D.
Voltage adjustment rheostat
Correct Answer
A. Load rheostat -
- 41.
The portion of the voltage regulator that supplies exciter field voltage is transformer
- A.
(T1) and rectifier (B3)
- B.
(T3) and rectifier (B2)
- C.
(T2) and rectifier (B1)
- D.
(T1) and rectifier (CR26)
Correct Answer
D. (T1) and rectifier (CR26) -
- 42.
Refer to fold out 1. after performing an operational check of the -86d generator set you proceed to shut the unit down. after the generator stops you notice the engine on light continues to glow. what is the probable cause of this trouble?
- A.
S46 open
- B.
S48 open
- C.
S46 closed
- D.
S48 closed
Correct Answer
D. S48 closed -
- 43.
Refer to fold out 1. during operation of the -86 you get no responce when you place s13 in the GENERATE position. a check of voltage at j8, terminal N shows 12 volts DC. whats the probable cause of this trouble?
- A.
M4 is open
- B.
S53 is open
- C.
K23 is open
- D.
K16 is open
Correct Answer
B. S53 is open -
- 44.
Refer to foldout 1. You are operating an -86 at governed speed but voltage does not build up. What is the probable cause of this trouble?
- A.
S1 is in the automatic position
- B.
R61 is turned fully clockwise
- C.
K16 contacts are closing
- D.
K23 contacts are open
Correct Answer
D. K23 contacts are open -
- 45.
During operation of the -86 what position do you place control switch S13 in to move the fuel rack and increase the engine speen to 2000 RPM
- A.
IDLE
- B.
GENERATE
- C.
BUILD UP VOLTS
- D.
AUTO TEST BANK
Correct Answer
B. GENERATE -
- 46.
Refer to foldout 1. During an operational check of the -86 the shut down solenoid energizes immediately after the engine run indicator illuminates. what is a probable cause of this trouble?
- A.
S48 open
- B.
S46 open
- C.
S49 shorted
- D.
S22 stuck open
Correct Answer
C. S49 shorted -
- 47.
Refer to fold out 1. During operation of the -86 the low coolant light (DS50) illuminates. but the unit does not shut down. What is th probable cause of this trouble?
- A.
A2
- B.
DS50
- C.
S55 is closed
- D.
S48 is closed
Correct Answer
A. A2 -
- 48.
What component controls the strength of the -86 generator exciter field L2?
- A.
Excitation relay K16
- B.
Time delay relay K14
- C.
Voltage regulator VR1
- D.
Automatic manual switch S1
Correct Answer
C. Voltage regulator VR1 -
- 49.
What component on the -86 generator is used to manually increase output voltage?
- A.
Voltage rheostat R61
- B.
Excitation relay K16
- C.
Test bank switch S202
- D.
Auto/manual switch S1
Correct Answer
D. Auto/manual switch S1 -
- 50.
Refer to foldout 1. where is the best point to check volage to the -86 generator exciter field?
- A.
J8, terminal D-F
- B.
J8, terminal V-X
- C.
VR1, terminal C-R
- D.
Automatic-manual switch S1
Correct Answer
A. J8, terminal D-F -
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Mar 21, 2022Quiz Edited by
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May 11, 2013Quiz Created by
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