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MCQs

Total Questions : 374 | Page 5 of 38 pages
Question 41. The form factor in AC is the ratio of
  1.    Peak value to average value
  2.    Peak value to rms value
  3.    Rms value to average value
  4.    Rms value to peak value
 Discuss Question
Answer: Option C. -> Rms value to average value
Question 42. The error of an instrument is normally given as a percentage of
  1.    Measured value
  2.    Full-scale value
  3.    Mean value
  4.    Rms value
 Discuss Question
Answer: Option B. -> Full-scale value
Question 43. The resistance offered to the passage of an in-varying current by a column of mercury at the temperature of melting ice of mass 14.4521 gms of uniform cross-sectional area and length 106.3cm is
  1.    Standard ohm
  2.    One international ohm
  3.    One ohm according to SI units
  4.    One ohm according to working standards
 Discuss Question
Answer: Option B. -> One international ohm
Question 44. The repeat accuracy of an instrument can be judged from its
  1.    Static error
  2.    Linearity error
  3.    Dynamic error
  4.    Standard deviation of error
 Discuss Question
Answer: Option D. -> Standard deviation of error
Question 45. In a gravity controlled instrument, the deflection angle is proportional
  1.    Measurand
  2.    Square of the measurand
  3.    Sine inverse of measurand
  4.    Sine of the measurand
 Discuss Question
Answer: Option C. -> Sine inverse of measurand
Question 46. The problem of Electrostatic coupling in a transformer is acute at
  1.    Low frequencies
  2.    Power frequencies
  3.    High frequencies
  4.    High load on the transformer
 Discuss Question
Answer: Option C. -> High frequencies
Question 47. Which meter is suitable for the measurement of 10mV at 50MHz?
  1.    Moving iron voltmeter
  2.    VTVM
  3.    Moving coil voltmeter
  4.    CRO
 Discuss Question
Answer: Option D. -> CRO
Question 48. Which of the following devices should be used for accurate measurement of low D.C. voltage?
  1.    Small range moving coil voltmeter
  2.    D.C. potentiometer
  3.    Small range thermocouple voltmeter
  4.    None of the above
 Discuss Question
Answer: Option B. -> D.C. potentiometer
Question 49. An instrument to be used for measurement and control should preferably have
  1.    Dead zone and dead time
  2.    Linear output and fast response
  3.    Non-linear output
  4.    A highly damped response
 Discuss Question
Answer: Option B. -> Linear output and fast response
Question 50. Electrostatic instruments are normally used for
  1.    Low current measurements
  2.    High current measurements
  3.    Low voltage measurements
  4.    High voltage measurements
 Discuss Question
Answer: Option D. -> High voltage measurements

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