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Electrical Measurement MCQ Question Set 3

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1. Ra and Rd are the opposite arms of a Wheatstone bridge as are Rc and Rb. The source voltage is applied across Ra and Rc. Then when the bridge is balanced which one of the following is true?




2. A setup is used to measure resistance R. The ammeter and voltmeter resistance are 0.01 Ω and 2000 Ω respectively. Their readings are 2 A and 180 V respectively, giving a measured resistance of 90 Ω. The percentage error in the measurement is?




3. A 35 V DC supply is connected across a resistance in series with an unknown resistance R. a voltmeter having a resistance of 1.2 kΩ is connected across 600 Ω resistance and reads 5 V. The value of the known resistance is 600 Ω. The value of resistance R will be?




4. A DC ammeter is rated for 15 A, 250 V. The meter constant is 14.4 A-s/rev. The meter constant at rated voltage may be expressed as ______




5. A DC ammeter has a resistance of 0.1 Ω and its current range is 0-100 A. If the range is to be extended to 0-500 A, the meter requires which of the following shunt resistance?




6. A 100 μA ammeter has an internal resistance of 100 Ω. The range is to be extended to 500 μA. The shunt required is of resistance ______




7. Resistance is measured by the voltmeter-ammeter method employing DC excitation and a voltmeter is connected directly across the unknown resistance. If the voltmeter and ammeter readings are subject to maximum possible errors of ±2.4 % and ±1% respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is?




8. A galvanometer with a full-scale current of 10 mA has a resistance of 1000 Ω. The multiplying power of a 100 Ω shunt with this galvanometer is?




9. The simultaneous applications of signals x (t) and y (t) to the horizontal and vertical plates respectively, of an oscilloscope, produce a vertical figure of 8 displays. If P and Q are constants and x(t) = P sin (4t + 30), then y(t) is equal to _____




10. In the simplest form, an AC bridge consists of _______




11. Source is _______




12. At high frequency, source consists of ______




13. What is the frequency range for a headphone as a detector?




14. For single frequency value, the most sensitive detector is ____




15. Tuned detectors are used in the frequency range of ____




16. Vibration galvanometers are used for ____




17. AC bridge is an outcome of ________




18. At very low frequencies in a AC bridge, the source is ______




19. At high frequencies in an AC bridge, the source is _______




20. The frequency range of a typical oscillator is _______




21. The power output for a typical oscillator is _____




22. The output waveform in an oscillator is _______




23. The output frequency of an oscillator is _______




24. The output power of an oscillator is not enough to drive power circuits.




25. Tuned amplifiers can be set to _______




26. Tuned amplifier circuits respond to broad bandwidth at bridge frequency.




27. Bridge balance equation for magnitude is given by which of the following relation?




28. Bridge must be balanced for _____




29. Phase angle is based on _______




30. For inductive impedances, the phase angle is _______




31. For capacitive impedances, the phase angle is _______




32. Bridge balance equation for magnitude in terms of admittances is given by the relation.




33. When a bridge is balanced?




34. In a capacitance bridge, the arms are _________




35. How is the bridge balanced?




36. Impedance Z4 consists of ______




37. Impedance Z3 consists of______




38. Unknown capacitance value is obtained by ______




39. Actual balance condition can be obtained by _____




40. Inductance comparison bridge is used to compute _____




41. Ratio arms of the bridge consists of _____




42. Inductance control is obtained by ______




43. Bridge depends on frequency.




44. Bridge can be used at audio frequency.




45. Bridge is used for the measurement of _________




46. Anderson bridge is used for ________




47. Anderson bridge is a modified form of ________




48. Anderson’s bridge is basically used for ________




49. Balance equation for computing the inductance is ________




50. When the capacitor used is imperfect, the inductance value changes.