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04/13/2005 Bank: (RTP - General Questions) Airman Knowledge Test Question Bank 04/13/2005
Bank: (RTP - General Questions)
Airman Knowledge Test Question Bank
Generated for St. George applicants retesting for the Aviation Mechanic Powerplant
ONLY Exam (General Questions).
The FAA computer-assisted testing system is supported by a series of supplement
publications. These publications, available through several aviation publishers, include
the graphics, legends, and maps that are needed to successfully respond to certain test
items.


1.

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Which is correct concerning a parallel circuit?

A) Total resistance will be smaller than the smallest resistor.

B) Total resistance will decrease when one of the resistances is removed.

C) Total voltage drop is the same as the total resistance.


2.

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Transfer of electric energy from one circuit to another without the aid of electrical connections

A) is called induction.

B) is called capacitance.

C) can cause excessive arcing and heat, and as a result is practical for use only with low
voltages/amperages.


3.

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Which of these will cause the resistance of a conductor to decrease?

A) Decrease the length or the cross sectional area.

B) Decrease the length or increase the cross sectional area.

C) Increase the length or decrease the cross sectional area.


4.

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Through which material will magnetic lines of force pass the most readily?

A) Copper.

B) Iron.

C) Aluminum.


5.

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If three resistors of 3 ohms, 5 ohms, and 22 ohms are connected in series in a 28-volt circuit,
how much current will flow through the 3-ohm resistor?

A) 9.3 amperes.
B) 1.05 amperes.

C) 0.93 ampere.


6.

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(Refer to General figure 11.) Find the total current flowing in the wire between points C and D.

A) 6.0 amperes.

B) 2.4 amperes.

C) 3.0 amperes.


7.

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What happens to the current in a voltage step up transformer with a ratio of 1 to 4?

A) The current is stepped down by a 1 to 4 ratio.

B) The current is stepped up by a 1 to 4 ratio.

C) The current does not change.


8.

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(Refer to General figure 13.) Determine the total current flow in the circuit.

A) 0.2 ampere.

B) 1.4 amperes.

C) 0.8 ampere.


9.

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Which requires the most electrical power?







(Note: 1 horsepower = 746 watts)

A) Four 30-watt lamps arranged in a 12-volt parallel circuit.

B) A 1/5-horsepower, 24-volt motor which is 75 percent efficient.

C) A 24-volt anticollision light circuit consisting of two light assemblies which require 3 amperes
each during operation.


10.

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What unit is used to express electrical power?

A) Volt.

B) Watt.

C) Ampere.


11.

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Which of the following are commonly used as rectifiers in electrical circuits?

A) Anodes.

B) Cathodes.
C) Diodes.


12.

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What is the operating resistance of a 30-watt light bulb designed for a 28-volt system?

A) 1.07 ohms.

B) 26 ohms.

C) 0.93 ohm.


13.

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(Refer to General figure 12.) Find the total resistance of the circuit.

A) 16 ohms.

B) 2.6 ohms.

C) 21.2 ohms.


14.

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Which is correct in reference to electrical resistance?

A) Two electrical devices will have the same combined resistance if they are connected in
series as they will have if connected in parallel.

B) If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit
will become greater.

C) An electrical device that has a high resistance will use more power than one with a low
resistance with the same applied voltage.


15.

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(Refer to General figure 14.) The total resistance of the circuit is

A) 25 ohms.

B) 35 ohms.

C) 17 ohms.


16.

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A 48-volt source is required to furnish 192 watts to a parallel circuit consisting of three resistors
of equal value. What is the value of each resistor?

A) 36 ohms.

B) 4 ohms.

C) 12 ohms.


17.

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The voltage drop in a circuit of known resistance is dependent on

A) the voltage of the circuit.

B) only the resistance of the conductor, and does not change with a change in either voltage or
amperage.
C) the amperage of the circuit.


18.

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A circuit has an applied voltage of 30 volts and a load consisting of a 10-ohm resistor in series
with a 20-ohm resistor. What is the voltage drop across the 10-ohm resistor?

A) 10 volts.

B) 20 volts.

C) 30 volts.


19.

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(Refer to General figure 11.) Find the voltage across the 8-ohm resistor.

A) 8 volts.

B) 20.4 volts.

C) 24 volts.


20.

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A lead acid battery with 12 cells connected in series (no load voltage = 2.1 volts per cell)
furnishes 10 amperes to a load of 2 ohms resistance. The internal resistance of the battery in
this instance is

A) 0.52 ohm.

B) 2.52 ohms.

C) 5.0 ohms.


21.

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A fully charged lead acid battery will not freeze until extremely low temperatures are reached
because

A) the acid is in the plates, thereby increasing the specific gravity of the solution.

B) most of the acid is in the solution.

C) increased internal resistance generates sufficient heat to prevent freezing.


22.

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What determines the amount of current which will flow through a battery while it is being
charged by a constant voltage source?

A) The total plate area of the battery.

B) The state of charge of the battery.

C) The ampere hour capacity of the battery.


23.

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The electrolyte of a nickel cadmium battery is the lowest when the battery is

A) being charged.

B) in a discharged condition.
C) under a heavy load condition.


24.

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The purpose of providing a space underneath the plates in a lead acid battery's cell container is
to

A) allow for convection flow of the electrolyte in order to provide for cooling of the plates.

B) prevent sediment buildup from contacting the plates and causing a short circuit.

C) ensure that the electrolyte quantity ratio to the number of plates and plate area is adequate.


25.

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Nickel-cadmium batteries which are stored for a long period of time will show a low liquid level
because

A) electrolyte evaporates through the vents.

B) of current leakage from individual cells.

C) electrolyte becomes absorbed into the plates.


26.

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Which of the following best describes the contributing factors to thermal runaway in a nickel-
cadmium battery installed in an aircraft?

A) High internal resistance intensified by high cell temperatures and a high current
discharge/charge rate in a constant potential (voltage) charging system.

B) Low internal resistance intensified by high cell temperatures and a high voltage
discharge/charge rate in a constant current charging system.

C) Low internal resistance intensified by high cell temperatures and a high current
discharge/charge rate in a constant potential (voltage) charging system.


27.

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The presence of any small amount of potassium carbonate deposits on the top of nickel-
cadmium battery cells in service is an indication of

A) normal operation.

B) excessive gassing.

C) plate sulfation.


28.

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If electrolyte from a lead-acid battery is spilled in the battery compartment, which procedure
should be followed?

A) Apply boric acid solution to the affected area followed by a water rinse.

B) Rinse the affected area thoroughly with clean water.

C) Apply sodium bicarbonate solution to the affected area followed by a water rinse.


29.

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Which statement regarding the hydrometer reading of a lead acid storage battery electrolyte is true?

A) The hydrometer reading does not require a temperature correction if the electrolyte
temperature is 80 °F.

B) A specific gravity correction should be added to the hydrometer reading if the electrolyte
temperature is below 59 °F.

C) The hydrometer reading will give a true indication of the capacity of the battery regardless of
the electrolyte temperature.


30.

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Which of the following statements is/are generally true regar