The secondary circuit of a C.T. is open when?

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Question:
The secondary circuit of a C.T. is open when?

1.a very high flux density is produced

2.a very low flux density is produced

3.a moderate flux density is produced

4. no flux density is produced

Posted Date:-2022-05-03 09:03:23

More MCQS Questions and answers

  1. A 10 mA PMMC ammeter reads 4 mA in a circuit. Its bottom control spring snaps suddenly. The meter will now show ______
  2. A current of – 8 + 6sqrt{2} (sin (ωt + 30°)) A is passed through three meters. The respective readings (in ampere) will be?
  3. A meter has a full scale of 90° at a current of 1 A. This meter has a perfect square law response. What is the current when the deflection angle is 45°?
  4. A PMMC rated as 100 μA is used in a rectifier type of instrument which uses full wave rectification. What is the sensitivity on sinusoidal AC?
  5. High flux density is due to less turns.
  6. In a moving iron meter, the deflection torque is proportional to?
  7. In A.C. circuits, power consumed is ________
  8. Potential transformers are used to measure ______
  9. Potential transformers are used with ______
  10. Ratio error can be minimised by _____
  11. The secondary winding of a C.T. ________
  12. The secondary winding of a C.T. is opened when?
  13. Two 100 μA full-scale PMMC meters are employed to construct a 10 V and a 100 V full-scale voltmeter. These meters will have figure of merit (sensitivities) as?
  14. Winding resistance of a P.T. can be reduced by ______
  15. A current of [2 + 2–√ sin (314t + 30) + 22–√ cos (952t +45)] is measured with a thermocouple type, 5A full scale, class 1 meter. The meter reading would lie in the range?
  16. A moving coil of a meter has 250 turns and a length and depth of 40 mm and 30 mm respectively. It is positioned in a uniform radial flux density of 450 mT. The coil carries a current of 160 mA. The torque on the coil is?
  17. A moving iron ammeter produces a full-scale torque of 240 μN-m with a deflection of 120° at a current of 10 A. the rate of change of self-inductance (μH/rad) of the instrument at full scale is?
  18. A rectifier type AC voltmeter consists of a series resistance R, an ideal full-wave rectifier bridge and a PMMC instrument. The internal resistance of the instrument is 100 Ω and a full- scale deflection is produced by a DC current of 1 mA. A voltage of 100 V (rms) is applied to the input terminals. The value of R required is?
  19. Another method of eliminating the ratio error is _____
  20. For a given Vp the Vs ___
  21. High flux density leads to _____
  22. High magnetizing forces in the core when removed suddenly lead to _____
  23. How is the transformation ratio dependent on the secondary burden?
  24. In a P.T. values of components of currents are negligible.
  25. In D.C. circuits, power is measured using ________
  26. Increasing secondary burden _______
  27. Leakage reactance is minimised by _____
  28. Moving Iron Instrument can be used as _______
  29. Potential transformer is similar in design to a _____
  30. Power is ______
  31. Ratio error in a P.T. depends on _____
  32. Secondary of a P.T. can be open circuited.
  33. The discharge of a capacitor through a ballistic galvanometer produces a damped frequency of 0.125 Hz and successive swings of 120, 96 and 76.8 mm. The damping ratio is?
  34. The discharge of a capacitor through a ballistic galvanometer produces a damped frequency of 0.125 Hz and successive swings of 120, 96 and 76.8 mm. The logarithmic decrement is?
  35. The excitation current of a C.T. ______
  36. The full-scale deflection current of a meter is 4 mA and its internal resistance is 400Ω. This meter is to have full deflection when 400 V is measured. What is the value of the series resistor to be used?
  37. The full-scale deflection current of an ammeter is 4 mA and its internal resistance is 400Ω. If this meter is to have a full deflection of 10 A, what is the value of the shunt resistance to be used?
  38. The inductance of a certain moving- iron ammeter is expressed as L = 10 + 3θ – θ24 μH, where θ is the deflection in radian from the zero position. The control spring torque is 25 × 10-6 Nm/rad. The meter carries a current of 5 A. What is the deflection?
  39. The primary current in a C.T. is _____
  40. The rectangular type of C.T. is built of ______
  41. The scale of a dynamometer type instrument marked in terms of RMS value would be_____
  42. The secondary circuit of a C.T. is open when?
  43. The secondary winding of a P.T. is designed for ____
  44. The standardization of AC potentiometer is done by _____
  45. Two ammeters, one with a full-scale current of 1 mA and internal resistance of 100 Ω and other a full-scale current of 10 mA and internal resistance of 25 Ω are in parallel. What is the total current, these two meters can carry without the reading out of scale in any meter?
  46. Vp is leading in phase, while Vs is lagging in phase.
  47. What is effect of the secondary burden on the ratio error?
  48. What is the effect of p.f. on secondary burden?
  49. When C.T. is connected in series with a line, a large voltage exists across the primary.
  50. When primary current flows, secondary circuit should be open.
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