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MCQs

Total Questions : 374 | Page 6 of 38 pages
Question 51. The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100°hm. This is to have full deflection when 100V is measured. What is the value of series resistor to be used?
  1.    99.99 K ohms
  2.    100 K ohms
  3.    99.99 ohms
  4.    100 ohms
 Discuss Question
Answer: Option A. -> 99.99 K ohms
Question 52. A spring controlled indicating instrument has a deflection of 90deg for maximum current I. The corresponding deflection for a gravity controlled instrument is
  1.    90°
  2.    120°
  3.    30°
  4.    0°
 Discuss Question
Answer: Option C. -> 30°
Question 53. PMMC type instruments normally use
  1.    Air friction damping
  2.    Fluid friction damping
  3.    Eddy current damping
  4.    None of the above
 Discuss Question
Answer: Option C. -> Eddy current damping
Question 54. Jewels are used in instruments for the purpose of
  1.    Damping
  2.    Torque control
  3.    Suppressing noise
  4.    Bearing
 Discuss Question
Answer: Option D. -> Bearing
Question 55. Which instrument has identical calibration for ac as well as dc values?
  1.    Hot wire type
  2.    Moving coil type
  3.    Induction type
  4.    Moving iron type
 Discuss Question
Answer: Option A. -> Hot wire type
Question 56. The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100°hm. If this meter is to have full deflection at 5A, what is the value of the shunt resistance to be used?
  1.    49.99 Ohms
  2.    1/49.99 ohms
  3.    1 Ohm
  4.    2 Ohms
 Discuss Question
Answer: Option B. -> 1/49.99 ohms
Question 57. If the instrument is to have a wide range, the instrument should have
  1.    Linear scale
  2.    Square-law scale
  3.    Exponential scale
  4.    Logarithmic scale
 Discuss Question
Answer: Option D. -> Logarithmic scale
Question 58. It can be stated that
  1.    CT operates at almost the same flux density as a PT
  2.    CT operates with a higher flux density than PT
  3.    CT operates with considerably lower flux density than a PT
  4.    No generalisation can be made with regard to the flux densities in CT and PT
 Discuss Question
Answer: Option C. -> CT operates with considerably lower flux density than a PT
Question 59. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken
  1.    From a source which is not the same as the unknown voltage
  2.    From a battery
  3.    From the same source as the unknown voltage
  4.    Any of the above
 Discuss Question
Answer: Option C. -> From the same source as the unknown voltage
Question 60. With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be
  1.    50Hz
  2.    100Hz
  3.    1kHz
  4.    500Hz
 Discuss Question
Answer: Option B. -> 100Hz

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