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A&P Study > Meters > Flashcards

Meters Flashcards

1
Q

A1. A special type of ohmmeter used for measuring extremely high resistances is called a megohmeter (megger). This meter is capable of measuring these high resistances because:

A

It uses a magnetogenerator as the power supply

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2
Q

A2. In order to measure large currents with the D’Arsonval ammeter:

A

Shunts are used

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3
Q

A4. An ohmmeter is constructed by using a simple galvanometer (moving coil) type meter movement and adding:

A

Battery
Series resistor
Rheostat

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4
Q

A5. A complete voltmeter must be a high resistance instrument because:

A

A large current must flow through the meter coil

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5
Q

A6. A dynamometer meter movement may be used to measure alternating current because:

A

The polarity of the coil and the magnets are changed with each alternation of the current

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6
Q

A7. To check leakage in a high voltage shielded cable, you would use a:

A

Megger

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7
Q

A8. The three general classifications of meters are:

A

Ammeter
Voltmeter
Ohmmeter

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8
Q

A9. A small battery, a light bulb, and two wire leads can be used to check _____.

A

Continuity

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9
Q

A10. What two instruments are most commonly used to check the continuity of a circuit?

A

Voltmeter

Ohmmeter

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10
Q

A11. The most satisfactory movement for the measurement of high alternating current is the _____.

A

Thermocouple meter

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11
Q

A13. An ammeter is always connected in a circuit in series because:

A

It has a very low internal resistance

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12
Q

A14. When using an ohmmeter to determine resistance of a lamp in a circuit:

A

All power to the lamp must be off

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13
Q

A15. What is the proper method when connecting voltmeters and ammeters in an airplane electrical circuit?

A

Ammeter in series

Voltmeter in parallel

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14
Q

A16. When instruments, including electrical types, do not give proper indications they should be _____.

A

Sent to an approved instrument overhaul and repair shop or returned to the manufacturer for servicing

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15
Q

A18. Jeweled bearings are used in meter movements because ____

A

The amount of friction they produce is minimal

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16
Q

A19. To determine the amount of current flow in a circuit, you would use _____.

A

An ammeter

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17
Q

A20. A shunt resistance is used in most ammeters because it makes it possible to use the same meter movement for a wide range of current measurement. The larger the current being measured, the ____.

A

The higher the voltage drop across the shunt

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18
Q

A21. What two devices are used to measure resistance?

A

Megger

Ohmmeter

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19
Q

A22. A voltmeter is used to measure the ____

A

Current at any one point in the circuit

8083 - Both the ammeter and the voltmeter are current measuring instruments

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20
Q

A23. In a D’Arsonval type meter, the primary purpose of the iron core is to _____

A

Concentrate the flux between the core and the pole piece

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21
Q

A24. The presence of an internal shunt identifies the meter as _____

A

an Ammeter

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22
Q

B1. The three general classifications of meters are ___

A

Ammeter
Voltmeter
Ohmmeter

23
Q

B2. When using a voltmeter to test a circuit, it must be connected in _____

A

Parallel

24
Q

B4. What two devices are used to measure resistance?

A

Megger and ohmmeter

25
Q

B5. A basic DC D’Arsonval meter is dependent for operation on

A

??? Equal but opposite electron potential ???

26
Q

B6. In order to measure large currents with the D’Arsonval ammeter, ____

A

Shunts are used

27
Q

B7. A shunt resistance is used in most ammeters because it makes it possible to use the same meter movement for a voltage range of current measurement. The larger the current being measured, the ______

A

Lower the resistance of the shunt allowing more current to flow through the shunt

28
Q

B8. To determine the amount of current flow in a circuit, you would use a ____

A

Ammeter

29
Q

B9. Jeweled bearings are used in meter movements because ____

A

The amount of friction they produce is minimal

30
Q

B10. A dynamometer meter movement may be used to measure alternating current because _____

A

The polarity of the coil and the magnets are changed with each alternation of the current

31
Q

B11. The presence of an internal shunt identifies the meter as a ____

A

an Ammeter

32
Q

B12. To check leakage in a high voltage shielded cable, you would use a ____

A

Megger

33
Q

B13. An ammeter is always connected in a circuit in a series because _____

A

It has a very low internal resistance

34
Q

B14. What two instruments are most commonly used to check the continuity of a circuit?

A

Voltmeter

Ohmmeter

35
Q

B15. An ammeter should be installed in a circuit in such a manner that ____

A

The positive terminal of the meter is connected to the positive battery terminal

36
Q

B16. What determines the amount of needle deflection of a D’Arsonval meter?

A

The number of windings and the magnetic force

37
Q

B17. What is the proper method when connecting voltmeters and ammeters in an airplane electrical circuit?

A

Ammeters in series

Voltage in parallel

38
Q

B18. A small batter, a light bulb, and two wire leads can be used to check ____

A

Continuity

39
Q

B19. The voltage developed in the thermocouple type meter depends on the ____

A

Material of which the wires are made

40
Q

B20. In a D’Arsonval type meter, the primary purpose of the iron core is to ____

A

Concentrate the flux between the core and the pole piece

41
Q

C1. What two devices are used to measure resistance?

A

Megger

Ohmmeter

42
Q

C2. The presence of an internal shunt identifies the meter as a ____

A

Ammeter

43
Q

C3. What determines the amount of needle deflection of a D’Arsonval meter?

A

The number of windings and the magnetic force

44
Q

C4. A shunt resistance is used in most ammeters because it makes it possible to use the same meter movement for a wide range of current measurement. The larger the current being measured, the ____

A

Lower the resistance of the shunt allowing more current to flow through the shunt

45
Q

C5. Jeweled bearings are used in meter movements because ____

A

The amount of friction they produce is minimal

46
Q

C6. When using an ohmmeter to determine resistance of a lamp in a circuit, ____

A

All power to the lamp must be off

47
Q

C7. When instruments, including electrical types, do not give proper indications, they should be ____

A

Sent to an approved instrument overhaul and repair shop or the manufacturer for servicing

48
Q

C8. The three general classifications of meters are ____

A

Ammeter
Voltmeter
Ohmmeter

49
Q

C11. What is the proper method when connecting voltmeters and ammeters in an airplane electrical circuit?

A

Ammeters in series

Voltmeters in parallel

50
Q

C12. In order to measure large currents with the D’Arsonval ammeter, ____

A

Shunts are used

51
Q

C13. In a D’Arsonval type meter, the primary purpose of the iron core is to _____

A

Concentrate flux between the core and the pole piece

52
Q

C14. An ohmmeter may be constructed by using a simple galvanometer (moving coil) type meter movement and adding a ____

A

Battery
Series resistor
Rheostat

53
Q

C15. What two instruments are most commonly used to check the continuity of a circuit?

A

Voltmeter

Ohmmeter

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