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measurement, conversion and control > questions > Flashcards

questions Flashcards

1
Q

What device is similar to an RTD but has a negative temperature coefficient?

A

themistor

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2
Q

The silicon-controlled rectifier can be turned off

A

by forced commutation

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3
Q

The output voltage of a typical thermocouple is

A

less than 100mV

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4
Q

The connections to a thermocouple

A

can produce an unwanted thermocouple effect, which must be compensated for

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5
Q

What is the zero-voltage switch used for?

A

to reduce radiation of high frequencies during turn on of a high current to a load

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6
Q

Temperature sensing can be achieved by the use of

A

A. thermocouples
B. RTDs
C. thermistors
D. All of the above

(D)

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7
Q

The purpose of compensation for a thermocouple is

A

to cancel unwanted voltage output of a thermocouple

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8
Q

The change in value of an analog signal during the conversion process produces what is called the

A

quantization error

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9
Q

Which of the following performance specifications applies to a sample-and-hold circuit?

A

Aperture time

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10
Q

RTDs are typically connected with other fixed resistors

A

in bridge configuration

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11
Q

Holding current for an SCR is best described as

A

the amount of current required to maintain conduction

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12
Q

What is the moving part of a linear variable differential transformer

A

core

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13
Q

A resistance temperature detector produces a voltage for a given change in temperature.

A

FALSE

(RTD is a passive device it cannot produce a “VOLTAGE DROP” on its own, but it produces a change in resistance. The resistance is measured by external electronic devices by passing a small current through the RTD which would generate a voltage.)

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14
Q

The triac provides better dc power control than the SCR.

A

FALSE

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15
Q

The SCR is ideal for ac applications.

A

FALSE

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16
Q

Displacement, velocity, and acceleration can all be measured by using specific motion transducers.

A

TRUE

17
Q

A strain gauge uses the principle of capacitance for its operation.

A

FALSE

18
Q

Thermocouple connections must be taken into account to ensure a high degree of accuracy.

A

TRUE

19
Q

Thermocouple connections must be taken into account to ensure a high degree of accuracy.

A

TRUE

20
Q

The change in value of the analog signal during the sampling process produces what is called the quantization error.

A

True

21
Q

Pressure transducers are devices that exhibit a change in resistance inversely proportional to a change in pressure.

A

FALSE

(A pressure transducer produces an electrical output proportional to the pressure applied. Are directly proportional to pressure over a wide range of frequencies.)

22
Q

A basic sample-and-hold circuit consists of an analog switch, a capacitor, and an instrumentation amplifier.

A

FALSE

A basic sample-and-hold circuit has two operational amplifiers, an analog switch and a capacitor.

23
Q

Noncontacting displacement transducers include optical and capacitive transducers.

A

TRUE

24
Q

All triacs operate in __________.

A

Quadrant 1 and 3

25
Q

The number of bits in a digital word determines the number of digital combinations that will be represented. The number of combinations can be calculated by ________.

A

raising 2 to the number of bits in the digital word

26
Q

A(n) _____ can be rapidly switched on and off remotely by another controlling circuit.

A

triac

27
Q

A sample-and-hold circuit consists of _________.

A

two op-amps, an analog switch, and a capacitor

28
Q

RTDs, strain gauges, and pressure transducers are _____ devices.

A

resistive

29
Q

A thermistor’s temperature characteristic is essentially _________.

A

logarithmic

30
Q

The three types of relative pressure measurement are ________.

A

absolute, gauge, and differential

31
Q

The two most common types of analog-to-digital converters discussed in this chapter were the ______.

A

flash converter and the successive approximation converter

32
Q

The voltage produced by a thermocouple is called the _________.

A

seebeck voltage

33
Q

The ________ are two types of acceleration transducers.

A

LVDT and the piezoelectric

34
Q

A triac is different from an SCR because ________

A

it allows current flow in both directions

35
Q

The ______ is composed of a transformer with a movable core, a primary, and two secondaries.

A

LVDT

measurement, conversion and control (1 decks)

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