Electrical Measurement and Instrumentation Online Test

1. Consider a circuit consisting of two capacitors C₁ and C₂. Let R be the resistance and L be the inductance which are connected in series. Let Q₁ and Q₂ be the quality factor for the two capacitors. While measuring the Q value by the Parallel Connection method, the value of the Q factor is?

2. BJT is used in the amplifier stage.

3. Strain gauge works on the principle of _______

4. The source of error in a Wheatstone bridge is due to _________

5. Sensors produce frequency which is counted by _________

6. Tuned amplifiers can be set to _______

7. When the bridge is balanced, what is the current flowing through the galvanometer?

8. Moving Iron Instrument can be used as ____________

9. Gauge factor for a semiconductor strain gauge is _______

10. What is the flyback period?

11. The CT supplies current to the current coil of a wattmeter power factor meter, energy meter and, an ammeter. These are connected as?

12. How is 11.87 V displayed on a 10 V range for a 4 digit display?

13. Multiplexing after A/D conversion provides immunity to noise.

14. In the ring type of core, the secondary winding is ________

15. User must wait for a stable reading.

16. A CRO probe has an impedance of 500 kΩ in parallel with a capacitance of 10 pF. The probe is used to measure the voltage between P and Q as shown in the figure. The measured voltage will be?

17. At high Q values, the angular balance condition is _________

18. Energy meter reads correctly when the ___________

19. A sampling watt-meter is used to measure the average power of a load. The peak to peak voltage of the square wave is 10 V and the current is a triangular wave of 5A p-p. The reading in watt will be?

20. Lumped parameter delay line consists of________

21. A transducer must have _____________

22. What is the main component of an integrating type DVM?

23. Stress vs strain curve is always linear.

24. In the Two wattmeter method of measuring power in a balanced three-phase circuit, one wattmeter shows zero and the other positive maximum. The load power factor is?

25. Measurement of energy involves _________

26. Eddy e.m.f produces a torque.

27. High flux density is due to less turns.

28. When input is positive, then output is?

29. Ringing effects can cause false triggering.

30. The analog signal is digitized using _________

31. The resistance can be measured most accurately by _________

32. The simplest type of bridge used for the measurement of medium resistances is known as _________

33. The four arms of an AC bridge network are as follows:

Arm AB: unknown impedance
Arm BC: standard capacitor C2 of 1000pf
Arm CD: a non-inductive resistance of R of 100 Ω in parallel to a capacitor of 0.01 μF
Arm DA: a non-inductive resistance of 1000 Ω

The supply frequency is 50 Hz and connected across terminals B and D. If the bridge is balanced with the above value, determine the value of unknown Impedance.

34. Which of the following should satisfy for measuring higher temperatures using a thermocouple?

35. A dual beam oscilloscope has same sweep rates for different channels.

36. C.T. and P.T. are standardized at _________

37. Piezoelectric transducer consists of _________

38. For lower accuracies _________

39. Stray capacitance effects can be minimized by __________

40. Ratio arms of the bridge consists of _________

41. The detector used in a high voltage Schering bridge is _________

42. Accuracy of Kelvin bridge is of the order of _________

43. The accuracy of a bridge depends on the _________

44. A resistor of 10 kΩ with the tolerance of 5% is connected in parallel with 5 kΩ resistors of 10% tolerance. What is the tolerance limit for a parallel network?

45. Etched foil strain gauges are flexible.

46. Potential transformers are used with _________

47. Accuracy depends on ____________

48. Inductive transduction involves ___________

49. What is a thermopile?

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