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General Knowledge

MEASUREMENTS MCQs

Total Questions : 61 | Page 3 of 7 pages
Question 21.  The output voltage of a typical thermocouple is
  1.    less than 100 mV
  2.    greater than 1 V
  3.    Thermocouples vary resistance, not voltage.
  4.    None of the above
 Discuss Question
Answer: Option A. -> less than 100 mV
Question 22.  The resistive change of a strain gauge
  1.    is based on the weight placed upon it, but can be many thousands of ohms
  2.    is usually no more than 100 omega.gif
  3.    is based on the gauge factor, but is typically less than an ohm
  4.    has a positive temperature coefficient
 Discuss Question
Answer: Option C. -> is based on the gauge factor, but is typically less than an ohm
Question 23.  What is the zero-voltage switch used for?
  1.    To reduce radiation of high frequencies during turn-on of a high current to a load
  2.    To control low-voltage circuits
  3.    To provide power to a circuit when power is lost
  4.    For extremely low-voltage applications
 Discuss Question
Answer: Option A. -> To reduce radiation of high frequencies during turn-on of a high current to a load
Question 24.  Temperature sensing can be achieved by the use of
  1.    thermocouples
  2.    RTDs
  3.    thermistors
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 25.  The purpose of compensation for a thermocouple is
  1.    to decrease temperature sensitivityto
  2.    to increase voltage output
  3.    to cancel unwanted voltage output of a thermocouple
  4.    used for high-temperature circuits
 Discuss Question
Answer: Option C. -> to cancel unwanted voltage output of a thermocouple
Question 26.  The change in value of an analog signal during the conversion process produces what is called the
  1.    quantization error
  2.    resolution error
  3.    Nyquist error
  4.    sampling error
 Discuss Question
Answer: Option A. -> quantization error
Question 27. . 
Which of the following performance specifications applies to a sample-and-hold circuit?
  1.    Aperture time
  2.    Aperture droop
  3.    Feedback
  4.    Acquisition jitter
 Discuss Question
Answer: Option A. -> Aperture time
Question 28. . What is the moving part of a linear variable differential transformer?
  1.    Primary
  2.    Secondary
  3.    Diaphragm
  4.    Core
 Discuss Question
Answer: Option D. -> Core
Question 29. . RTDs are typically connected with other fixed resistors
  1.    in a pi configuration
  2.    in a bridge configuration
  3.    and variable resistors
  4.    and capacitors in a filter-type circuit
 Discuss Question
Answer: Option B. -> in a bridge configuration
Question 30. . Holding current for an SCR is best described as
  1.    the minimum current required for turn-off
  2.    the current required before an SCR will turn on
  3.    the amount of current required to maintain conduction
  4.    the gate current required to maintain conduction
 Discuss Question
Answer: Option C. -> the amount of current required to maintain conduction

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