Deck 8: Measuring Instruments

Question 1

The ____ of an AC wave form can be found by dividing 1 by the time (T) it takes to complete one cycle.

A) wavelength
B) frequency
C) wave number
D) period

Answer 1

B

Question 2

Analog meters operate on the principle that like magnetic poles attract each other.

Answer 2

False

Question 3

In an oscilloscope, which control determines which channel of a dual-trace oscilloscope is to be used?

A) beam finder
B) ADD-ALT.-CHOP
C) CH 1-both-CH 2
D) AC-GRD-DC

Answer 3

C

Question 4

____ meters are characterized by the fact that they use a pointer and scale to indicate their value.

A) Digital
B) Analog
C) Electric
D) Battery-operated

Question 5

A bridge is constructed by connecting six components to form a parallel-series circuit.

Question 6

Most AC ammeters use ____ to change scale values.

A) shunts
B) a Hall generator
C) a voltmeter
D) a current transformer

Question 7

DC-AC clamp-on ammeters use the ____ effect as the basic principle of operation.

A) Ohm
B) Seebeck
C) Lenz
D) Hall

Question 8

The secondary winding of a CT should never be opened when power is being applied to the primary.

Question 9

In an oscilloscope, which control is used to locate the position of the trace if it is off the display?

A) beam finder
B) probe adjust
C) intensity and focus
D) AC-GRD-DC

Question 10

The ____ is used to measure resistance.

A) voltmeter
B) transformer
C) ohmmeter
D) milliammeter

Question 11

The bridge used to measure resistance is called a ____ bridge.

A) rectifier
B) VOM
C) Wheatstone
D) Hall

Question 12

The ammeter, ____ the voltmeter, is a very ____ device.

A) unlike; low-impedance
B) like; low-impedance
C) unlike; high-impedance
D) like; high-impedance

Question 13

The low-impedance voltage tester ____.

A) can be used to test low-power circuits
B) has a very large current draw
C) has a digital display
D) is susceptible to feedback voltages

Question 14

A Megger® is available as a battery-operated model.

Question 15

The wattmeter is used to measure the ____ in a circuit.

A) voltage
B) current
C) resistance
D) power

Question 16

The ohmmeter ____.

A) must never be connected to a circuit when the power is turned on
B) does not have its own power supply
C) has a high operating voltage
D) is used to measure current

Question 17

An oscilloscope is a(n) ____.

A) voltmeter
B) ohmmeter
C) ammeter
D) wattmeter

Question 18

The Hall generator produces a voltage in the presence of a magnetic field.

Question 19

Most voltmeters are ____ voltmeters.

A) partial-scale
B) fixed
C) multirange
D) monorange

Question 20

A current transformer is basically a ____ transformer.

A) paraboloid
B) prismic
C) spherical
D) toroid