21. The resistance of two coils of a watt-meter are 0.0 Ω and 100 Ω respectively and both are non-inductive. The current through a resistance load is 20 A and the voltage across it is 30 V. In one of the two ways of connecting the voltage coil, the error in the reading would be
22. The use of thermocouple meters for ac measurement leads to a meter scale which is
23. Which one of the following statements is not correct in connection with electrodynamic instruments?
24. Which of the following equipment can check the condition of a transistor?
25. The scale used for moving coil meter is
26. The error in measurement of a DC voltmeter with input signal: 1.5 V, voltage range: 2 V, accuracy: ± (25 ppm of reading + 5 ppm of range) is
27. In wire-wound strain gauges, the change in resistance on application of strain is mainly due to
28. Absolute encoders are normally used for:
29. In a Q meter, distributed capacitance of coil is measured by changing the capacitance of the tuning capacitor. The values of tuning capacitor are C1 and C2 for resonant frequency f1 and 2f1 respectively. The value of distributed capacitance is:
30. Three phase four wire energy meter is used to measure:
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