# Age 2A672 (Vol 1)

88 Questions | Total Attempts: 202  Settings  • 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.

• 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.

• B.

• 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.

• C.

• 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.

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