Measurement, Conversion and Control problems
- 1. The resistive change of a strain gauge
Options- A. is based on the weight placed upon it, but can be many thousands of ohms
- B. is usually no more than 100 Ω
- C. is based on the gauge factor, but is typically less than an ohm
- D. has a positive temperature coefficient Discuss
Correct Answer: is based on the gauge factor, but is typically less than an ohm
- 2. The change in value of an analog signal during the conversion process produces what is called the
Options- A. quantization error
- B. resolution error
- C. Nyquist error
- D. sampling error Discuss
Correct Answer: quantization error
- 3. The purpose of compensation for a thermocouple is
Options- 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 Discuss
Correct Answer: to cancel unwanted voltage output of a thermocouple
- 4. What is the moving part of a linear variable differential transformer?
Options- A. Primary
- B. Secondary
- C. Diaphragm
- D. Core Discuss
Correct Answer: Core
- 5. Holding current for an SCR is best described as
Options- 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 Discuss
Correct Answer: the amount of current required to maintain conduction
- 6. What device is similar to an RTD but has a negative temperature coefficient?
Options- A. Strain gauge
- B. Thermistor
- C. Negative-type RTD
- D. Thermocouple Discuss
Correct Answer: Thermistor
- 7. Which of the following performance specifications applies to a sample-and-hold circuit?
Options- A. Aperture time
- B. Aperture droop
- C. Feedback
- D. Acquisition jitter Discuss
Correct Answer: Aperture time
- 8. What is the zero-voltage switch used for?
Options- 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 Discuss
Correct Answer: To reduce radiation of high frequencies during turn-on of a high current to a load
- 9. RTDs are typically connected with other fixed resistors
Options- A. in a pi configuration
- B. in a bridge configuration
- C. and variable resistors
- D. and capacitors in a filter-type circuit Discuss
Correct Answer: in a bridge configuration
- 10. The silicon-controlled rectifier can be turned off
Options- A. by a negative gate pulse
- B. by forced commutation
- C. with the off switch
- D. when the breakover voltage is exceeded Discuss
Correct Answer: by forced commutation
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