A Physics Practice Guide For Beginner's

1. (206) The principle behind all electromechanical generation that many aerospace equipment devices have as their basis is

Conduction.

Commutation.

Rectification.

Electromagnetic induction.

2. (222) A good solder cup connection shows the

Insulation.

Solder flux.

Wire number.

Wire contour.

3. (204) What is the total resistance of a parallel circuit with branch voltages of 440 volt (v) and 440v and branch currents of 4 amp (a) and 16a?

11 ohms.

22 ohms.

44 ohms.

68.75 ohms.

4. (205) The area around a magnet where its influence can be felt, is defined as the

Magnetic theory.

Saturation principle.

Magnetic field.

Law of attraction and repulsion.

5. (206) The electromechanical generation of a voltage requires a magnetic field, relative motion, and

A complete circuit.

A conductor.

An insulator.

A load.

6. (217) When conducting current checks, you should connect the multimeter in the circuit in

Reverse order.

Series-parallel.

Parallel.

Series.

7. (217) When performing a continuity check on a wire using the diode test mode, a good wire will register

As OL.

As zero.

As infinity.

A beep.

8. (209) Basically, a relay is an electrically operated

Meter.

Motor.

Switch.

Safety device.

9. (202) This is used to control current flow in a circuit.

Voltage.

Coulombs.

Resistance.

Conductivity.

10. (202) The relationship of voltage, current, and resistance is expressed through

E, I, and C formula.

Power formulas.

Conductance.

Ohm’s Law.

11. (214) How many PN junctions does the silicon-controlled rectifier (SCR) have?

One.

Two.

Three.

Four.

12. (207) When direct current is applied to an inductor reaches maximum, and is steady, the magnetic field around the inductor will.

Collapse.

Stop expanding.

Start to decrease slowly.

Continue to expand slowly.

13. (212) This happens to the Zener diode in the forward-bias direction.

Is destroyed.

Acts as a normal diode.

Conducts at zener value.

Exceeds the peak inverse voltage rating.

14. (212) A Zener being used as a regulator must have a resistor placed in the circuit in

Series.

Parallel.

Everse-bias.

Series-parallel.

15. (213) A light-emitting diode (LED) produces light when it is

Gated.

Neutral.

Forward-biased.

Reverse-biased.

16. (221) A pitted or worn soldering iron tip should be redressed with a flat, fine, single-cut file, and then be

Tinned.

Cleaned of solder.

Replaced.

Checked for length.

17. (223) This is the best method of repairing a lifted or peeled conducting strip on a printed circuit board (PCB).

Bond it.

Glue it.

Replace it with bare wire.

Replace it with insulated wire.

18. (208) A step-up transformer has this many turns of a wire in the secondary windings over the primary windings.

Equal.

Less.

More.

None.

19. (201) The term "dielectric" is used to describe

Conductors.

Insulators.

Doped atoms.

Semi-conductors.

20. (202) This defines the flow or drift of electrons through a conductor in the same direction at the same time.

Conductivity.

Voltage.

Current.

Valence.

21. (210) A capacitor stores energy in the form of

Heat.

Resistance.

A magnetic field.

An electrostatic field.

22. (203) Total current in a series circuit

Remains the same throughout the circuit.

Is the sum of the current through each component.

Is the reciprocal of the current through one component.

Is the reciprocal of the sum of the currents through each component.

23. (210) In a capacitor, the dielectric is also known as the

Outer case.

Positive lead.

Insulator.

Conductor.

24. (206) The function of the commutator in a direct current (DC) generator is to

Complete the circuit to the load.

Induce DC into the external circuit.

Rectify the input.

Change alternating current (AC) voltage to DC voltage.

25. (210) The factors that determine the time required to charge a capacitor are the capacitance size and the

Circuit current.

Applied voltage.

Type of dielectric.

Amount of resistance.

26. (214) A silicon controlled rectifier (SCR) is mainly used as a/an

Fuse.

Spike protector.

Circuit breaker.

Electronic switch.

27. (215) During which troubleshooting step do you begin to use the schematic diagram as an invaluable tool?

Recognition.

Verification.

Analysis.

Isolation.

28. (220) One way you are able to identify electrostatic sensitive devices is by

The MIL-SPC–235 symbol or a warning marking.

The special coloring package as specified in local directives.

The MIL-STD–129 symbol or a caution marking.

A special control number as specified in local directives.

29. (221) A heat sink is used in soldering to

Prevent heat from damaging the component being soldered.

Prevent heat from damaging other components in the circuit.

Apply heat to the component being soldered.

Apply heat to other components in the circuit.

30. (222) You insert a wire into a solder cup until this happens.

Wire reaches the bottom of the cup.

Wire protrudes from the weep hole.

Wire clears the top of the cup.

Insulation touches the cup.

31. (201) Up to how many valence electrons are needed to make a good conductor?

3.

4.

5.

6.

32. (203) What is the voltage drop in a series circuit with a power rating of 9.68 watts, resistances of .55 kilo ohms, 4 k ohms, and 450 ohms, and current flow through the resistors of 44 milliamp (ma), 44 ma, and 44 ma?

20 volt (v).

220v.

425v.

441v.

33. (211) A diode has a fairly simple construction and the diode's anode is constructed of this type of material.

Neutral (N).

Biased (B).

Positive (P).

Negative.

34. (204) In a parallel circuit, the total voltage is equal to the

Sum of the voltages across each branch.

Voltage across each resistor.

Voltage across each branch.

The reciprocal of the voltage across the resistances.

35. (214) In order for a silicon-controlled rectifier (SCR) to be turned off, the

Forward breakover voltage must exceed the holding voltage.

Current must drop below the holding current.

Negative amp switch must activate.

Negative volt switch must activate.

36. (211) A diode placed in a circuit in reverse bias is being used as

A spike protector.

An amplifier.

A regulator.

A rectifier.

37. (215) Which troubleshooting step involves knowing proper equipment operation?

Analysis.

Recognition.

Repair and check.

Elimination and isolation.

38. (212) A Zener diode will conduct in reverse-bias

For a second or two at a time.

Until the gate potential has been reached.

Once the avalanche point has been reached.

Until an operational breakdown point has been reached.

39. (216) Which troubleshooting aid is designed to assist you in finding the actual unit location of electrical components?

Zones.

Schematic.

Wiring diagram.

Reference designation index.

40. (216) This troubleshooting aid is designed to assist you in finding components on a diagram.

Zone.

Schematic.

Wiring diagram.

Reference designation index.

41. (219) This could be the indication from the 8025A multimeter when you are checking a serviceable capacitor.

A beep.

An extended analog bar graph.

An OL display.

A 0 ohms display.

42. (206) In a simple generator, which would be the most difficult method used to increase the output?

Increase the area of the conductor.

Increase the amount of motion.

Increase the strength of the magnetic field.

Increase the relative resistance.

43. In which form does an inductor store energy as an electromagnetic device?

Heat.

Resistance.

Magnetic field.

Electrostatic field.

44. (218) Use this to set a value to the oscilloscope's vertical grid markings.

Focus.

Pitch control.

Voltage selector.

Time sweep selector.

45. (219) How many junctions are checked to test the serviceability of a transistor?

1.

2.

3.

4.

46. (201) Every atom must contain these types of particles.

Electrons and protons.

Electrons and neutrons.

Protons and neutrons.

Electrons, protons, and neutrons.

47. (207) The process by which a current, or voltage, change in one coil produces a varying current in another coil is called

Inductance.

Self-induction.

Mutual induction.

Inductive reactance.

48. (209) Once energized, a relay requires a second coil to be energized before the contacts will return to their original positions. This is called a

Locking relay.

Latching relay.

Timing relay.

Tripping relay.

49. (214) The amount of current required to gate a silicon-controlled rectifier (SCR) is called

Forward breakover voltage.

Holding current.

Peak voltage.

Gate current.

50. (217) The bar graph of the 8025A multimeter is updated 10 times as often as the digital display. What does the bar graph indicate?

Absolute value.

Digital display.

Operating mode.

Range indication.

51. (213) What is the approximate operating voltage of a forward-biased light-emitting diode (LED)?

.5 volts.

.1 volt.

1.6 volts.

2.4 volts.

52. (210) What is the opposition of a capacitor to alternating current (AC) called?

Inductive reactance.

Impedance.

Capacitive reactance.

Capacitance.

53. (203) In a series circuit, what is the wattage of a circuit with 28 volts applied and a total resistance of .2 ohms?

.14 watts (w).

.14 kilowatts (kw).

3.92 w.

3.92 kw.

54. (204) Source current in a parallel circuit will be divided according to each branch's

Voltage.

Power.

Length.

Resistance.

55. (214) Which type of silicon-controlled rectifier (SCR) would be most effective to switch 4 amperes at up to 425 volts?

Low current.

Medium current.

High current.

Very high current.