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General Knowledge

MEASUREMENTS MCQs

Total Questions : 61 | Page 4 of 7 pages
Question 31. . All triacs operate in __________.
  1.    quadrant 1 and quadrant 2
  2.    quadrant 1 and quadrant 3
  3.    quadrant 2 and quadrant 4
  4.    quadrant 3 and quadrant 4
 Discuss Question
Answer: Option B. -> quadrant 1 and quadrant 3
Question 32. . 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 ________.
  1.    raising 2 to the number of bits in the analog word
  2.    raising 2 to the number of bits in the digital word
  3.    multiplying 2 by the number of bits in the analog word
  4.    determining the range of the analog word
 Discuss Question
Answer: Option B. -> raising 2 to the number of bits in the digital word
Question 33. . 
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 34. . The silicon-controlled rectifier can be turned off
  1.    by a negative gate pulse
  2.    by forced commutation
  3.    with the off switch
  4.    when the breakover voltage is exceeded
 Discuss Question
Answer: Option B. -> by forced commutation
Question 35. . A sample-and-hold circuit consists of _________.
  1.    an op-amp, an analog switch, and an inductor
  2.    an op-amp, an analog switch, and a capacitor
  3.    two op-amps, an analog switch, and a variable resistor
  4.    two op-amps, an analog switch, and a capacitor
 Discuss Question
Answer: Option D. -> two op-amps, an analog switch, and a capacitor
Question 36. . What device is similar to an RTD but has a negative temperature coefficient?
  1.    Strain gauge
  2.    Thermistor
  3.    Negative-type RTD
  4.    Thermocouple
 Discuss Question
Answer: Option B. -> Thermistor
Question 37. . RTDs, strain gauges, and pressure transducers are _____ devices.
  1.    resistive
  2.    inductive
  3.    capacitive
  4.    solid-state
 Discuss Question
Answer: Option A. -> resistive
Question 38. . A(n) _____ can be rapidly switched on and off remotely by another controlling circuit.
  1.    triac
  2.    diac
  3.    RTD
  4.    zero-voltage switch
 Discuss Question
Answer: Option A. -> triac
Question 39. . 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 40. . 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

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