Age 2A672 (Vol 1)
- 1.(020) What signal powers the regulator card output pulse sent to the exciter field of the B809A generator?
- A.
28.5 volts direct current (VDC).
- B.
110 VDC.
- C.
115 volts alternating current (VAC)
- D.
200 VAC.
- 2.(011) The circuit in the bipolar transistor that carries 5 percent of the current flow is the
- A.
Emitter-collector circuit.
- B.
Control circuit.
- C.
Base circuit.
- D.
Load circuit.
- 3.(32) Refer to foldout 7. You are testing an alternating current (AC) generator and find B phase on the A/M24T-8 load bank isn't working. What is the probable cause of this trouble?
- A.
CB1.
- B.
CR1.
- C.
S56.
- D.
S1.
- 4.(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.
- 5.(003) In an inductive circuit, what is meant by current lags voltage by 90 degrees?
- A.
Current is maximum when voltage is zero; voltage is maximum when current is zero.
- B.
Current is zero when voltage is zero; voltage is maximum when current is maximum.
- C.
If current decreases, voltage aids the decrease.
- D.
If current increases, voltage aids the increase.
- 6.(004) What is the basic principle of operation for transformers?
- A.
Mutual induction.
- B.
Magnetic induction.
- C.
Counterelectromotive force.
- D.
Primary and secondary induction.
- 7.(011) 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.
- 8.(013) What controls the firing time of the unijunction transistor (UJT)?
- A.
Intrinsic standoff ratio.
- B.
Resistance in the circuit.
- C.
Capacitance in the circuit.
- D.
Resistance and capacitance in the circuit.
- 9.(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.
- 10.(010) In order to turn off a silicone-controlled rectifier (SCR), the current must drop below the
- A.
Trigger current.
- B.
Holding current.
- C.
Variable current.
- D.
Breakdown current.
- 11.(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.
AC.
- D.
Pure DC.
- 12.(006) What are the minority carriers in P-type material?
- A.
Neutrons.
- B.
Holes.
- C.
Electrons.
- D.
Protons.
- 13.(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.
- 14.(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.
Reverse biased.
- B.
Turned on.
- C.
Forward biased.
- D.
Not allowing current to flow.
- 15.(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.
- 16.(020) What condition is sensed by the direct current (DC) card on the B809A generator set?
- A.
Low fuel.
- B.
Overtemperature.
- C.
Under frequency.
- D.
Overfrequency.
- 17.(009) How is a zener diode connected in a circuit to regulate voltage?
- A.
In parallel to the load.
- B.
In series with the load.
- C.
In parallel to the resistor.
- D.
In series with the resistor.
- 18.(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.
- 19.(009) How is the zener diode connected in a circuit to protect the load?
- A.
In parallel to the resistor.
- B.
In series with the load.
- C.
In parallel to the load.
- D.
Forward biased.
- 20.(090) What is the primary use of a silicon-controlled rectifier (SCR)?
- A.
Electronic switch.
- B.
Voltage regulator.
- C.
Circuit amplifier.
- D.
Spike protector.
- 21.(001) The force required to move free electrons through a conductor is known as
- A.
Current.
- B.
Negative charge.
- C.
Voltage.
- D.
Electrostatic force.
- 22.(012) 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.
Resistance increases and current flow decreases.
- C.
Current decreases through the emitter-collector (E-C) circuit.
- D.
Current increases through the E-C circuit.
- 23.(010) The silicon-controlled rectifier (SCR) has how many layers?
- A.
1.
- B.
2.
- C.
3.
- D.
4.
- 24.(011) 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.
- 25.(001) In an atom, what electrons contain the most energy?
- A.
Valence electrons.
- B.
Orbiting electrons.
- C.
K shell electrons.
- D.
The energy is shared equally by all electrons.
Questions: 80 | Attempts: 2628 | Last updated: Jun 13, 2018
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