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MCQs

Total Questions : 374 | Page 3 of 38 pages
Question 21. In a moving coil instrument, the deflecting torque is proportional to
  1.    Current
  2.    Square of the current
  3.    Squareroot of the current
  4.    Sine of the measurand
 Discuss Question
Answer: Option A. -> Current
Question 22. In a moving iron meter, the deflecting torque is proportional to
  1.    Current through the coil
  2.    Square of the current through the coil
  3.    Sine of the measurand
  4.    Squareroot of the measurand
 Discuss Question
Answer: Option B. -> Square of the current through the coil
Question 23. The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
  1.    Active power in R phase
  2.    Active power of Y phase
  3.    Reactive power of R phase
  4.    Power proportional to 3 phase power if the load is balanced
 Discuss Question
Answer: Option C. -> Reactive power of R phase
Question 24. Which wave has the least form factor?
  1.    Square wave
  2.    Rectangular wave
  3.    Sine wave
  4.    Triangular wave
 Discuss Question
Answer: Option A. -> Square wave
Question 25. Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are
  1.    360V and 240V
  2.    300V each
  3.    400V and 200V
  4.    One of the meters out of the range and other 100V
 Discuss Question
Answer: Option A. -> 360V and 240V
Question 26. The two pressure coils of a single phase power factor meter have
  1.    The same dimensions and the same number of turns
  2.    The same dimension but different number of turns
  3.    The same number of turns but different dimensions
  4.    None of the above
 Discuss Question
Answer: Option A. -> The same dimensions and the same number of turns
Question 27. To measure the flux, devices used are based on
  1.    Voltaic effect
  2.    Piezo-electric effect
  3.    Hall effect
  4.    Photo-voltaic effect
 Discuss Question
Answer: Option C. -> Hall effect
Question 28. For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging
  1.    One of the wattmeters will read zero
  2.    Both give the same readings
  3.    One of the wattmeter connections will have to be reversed
  4.    Pressure coil of the wattmeter will become ineffective.
 Discuss Question
Answer: Option C. -> One of the wattmeter connections will have to be reversed
Question 29. The absolute measurement of resistance is done by
  1.    Ohm’s law method
  2.    Bridge Method
  3.    Rayleigh method
  4.    Lorenz method
 Discuss Question
Answer: Option D. -> Lorenz method
Question 30. No eddy current and hysteresis losses occur in
  1.    Electrostatic instruments
  2.    PMMC instruments
  3.    Moving iron instruments
  4.    Electrodynamo meter instruments
 Discuss Question
Answer: Option A. -> Electrostatic instruments

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