Measurement, Conversion and Control

Q1: The connections to a thermocouple

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

B produce an extra desirable thermocouple effect

C must be protected, since high voltages are present

D produce an extra desirable thermocouple effect and must be protected, since high voltages are present

Q2: The resistive change of a strain gauge

A is based on the weight placed upon it, but can be many thousands of ohms

B is usually no more than 100 omega.gif

C is based on the gauge factor, but is typically less than an ohm

D has a positive temperature coefficient

Q3: What device is similar to an RTD but has a negative temperature coefficient?

A Strain gauge

B Thermistor

C Negative-type RTD

D Thermocouple

Q4: What is the moving part of a linear variable differential transformer?

A Primary

B Secondary

C Diaphragm

D Core

Q5: Which of the following performance specifications applies to a sample-and-hold circuit?

A Aperture time

B Aperture droop

C Feedback

D Acquisition jitter

Q6: Temperature sensing can be achieved by the use of

A thermocouples

B RTDs

C thermistors

D All of the above

Q7: RTDs are typically connected with other fixed resistors

A in a pi configuration

B in a bridge configuration

C and variable resistors

D and capacitors in a filter-type circuit

Q8: 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

B To control low-voltage circuits

C To provide power to a circuit when power is lost

D For extremely low-voltage applications

Q9: The change in value of an analog signal during the conversion process produces what is called the

A quantization error

B resolution error

C Nyquist error

D sampling error

Q10: The purpose of compensation for a thermocouple is

A to decrease temperature sensitivity

B to increase voltage output

C to cancel unwanted voltage output of a thermocouple

D used for high-temperature circuits

Q11: The silicon-controlled rectifier can be turned off

A by a negative gate pulse

B by forced commutation

C with the off switch

D when the breakover voltage is exceeded

Q12: Holding current for an SCR is best described as

A the minimum current required for turn-off

B the current required before an SCR will turn on

C the amount of current required to maintain conduction

D the gate current required to maintain conduction

Q13: The output voltage of a typical thermocouple is

A less than 100 mV

B greater than 1 V

C Thermocouples vary resistance, not voltage.

D None of the above


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