Meters

Question 1

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:

Answer 1

It uses a magnetogenerator as the power supply

Question 2

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

Answer 2

Shunts are used

Question 3

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

Answer 3

Battery
Series resistor
Rheostat

Question 4

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

Answer 4

A large current must flow through the meter coil

Question 5

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

Answer 5

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

Question 6

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

Answer 6

Megger

Question 7

A8. The three general classifications of meters are:

Answer 7

Ammeter
Voltmeter
Ohmmeter

Question 8

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

Answer 8

Continuity

Question 9

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

Answer 9

Voltmeter

Ohmmeter

Question 10

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

Answer 10

Thermocouple meter

Question 11

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

Answer 11

It has a very low internal resistance

Question 12

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

Answer 12

All power to the lamp must be off

Question 13

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

Answer 13

Ammeter in series

Voltmeter in parallel

Question 14

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

Answer 14

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

Question 15

A18. Jeweled bearings are used in meter movements because ____

Answer 15

The amount of friction they produce is minimal

Question 16

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

Answer 16

An ammeter

Question 17

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 ____.

Answer 17

The higher the voltage drop across the shunt

Question 18

A21. What two devices are used to measure resistance?

Answer 18

Megger

Ohmmeter

Question 19

A22. A voltmeter is used to measure the ____

Answer 19

Current at any one point in the circuit

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

Question 20

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

Answer 20

Concentrate the flux between the core and the pole piece

Question 21

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

Answer 21

an Ammeter

Question 22

B1. The three general classifications of meters are ___

Answer 22

Ammeter
Voltmeter
Ohmmeter

Question 23

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

Answer 23

Parallel

Question 24

B4. What two devices are used to measure resistance?

Answer 24

Megger and ohmmeter

Question 25

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

Answer 25

??? Equal but opposite electron potential ???

Question 26

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

Answer 26

Shunts are used

Question 27

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 ______

Answer 27

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

Question 28

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

Answer 28

Ammeter

Question 29

B9. Jeweled bearings are used in meter movements because ____

Answer 29

The amount of friction they produce is minimal

Question 30

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

Answer 30

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

Question 31

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

Answer 31

an Ammeter

Question 32

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

Answer 32

Megger

Question 33

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

Answer 33

It has a very low internal resistance

Question 34

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

Answer 34

Voltmeter | Ohmmeter

Question 35

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

Answer 35

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

Question 36

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

Answer 36

The number of windings and the magnetic force

Question 37

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

Answer 37

Ammeters in series | Voltage in parallel

Question 38

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

Answer 38

Continuity

Question 39

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

Answer 39

Material of which the wires are made

Question 40

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

Answer 40

Concentrate the flux between the core and the pole piece

Question 41

C1. What two devices are used to measure resistance?

Answer 41

Megger | Ohmmeter

Question 42

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

Answer 42

Ammeter

Question 43

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

Answer 43

The number of windings and the magnetic force

Question 44

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 ____

Answer 44

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

Question 45

C5. Jeweled bearings are used in meter movements because ____

Answer 45

The amount of friction they produce is minimal

Question 46

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

Answer 46

All power to the lamp must be off

Question 47

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

Answer 47

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

Question 48

C8. The three general classifications of meters are ____

Answer 48

Ammeter Voltmeter Ohmmeter

Question 49

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

Answer 49

Ammeters in series | Voltmeters in parallel

Question 50

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

Answer 50

Shunts are used

Question 51

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

Answer 51

Concentrate flux between the core and the pole piece

Question 52

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

Answer 52

Battery Series resistor Rheostat

Question 53

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

Answer 53

Voltmeter | Ohmmeter