Measurement and Instrumentation

31. For measurement of inductance having high value, we should use

1. Maxwell's bridge
2. Maxwell Wein bridge
3. Hay's bridge
4. Any of the above

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32. For measurement of mutual inductance we can use

1. Anderson bridge
2. Maxwell's bridge
3. Heaviside bridge
4. Any of the above

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33. For measurements on high voltage capacitors, the suitable bridge is

1. Wein bridge
2. Modified De Santy's bridge
3. Schering bridge
4. Any of the above

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34. For measuring a very high resistance we should use

1. Kelvin's double bridge
2. Wheat stone bridge
3. Meggar
4. None of the above

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35. For measuring current at high frequency we should use

1. moving iron instrument
2. electrostatic instrument
3. thermocouple instrument
4. none of the above

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36. If an inductance is connected in one arm of bridge and resistances in the remaining three arms

1. the bridge can always be balanced
2. the bridge cannot be balanced
3. the bridge can be balanced if the resistances have some specific values
4. none of the above

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37. If an instrument has cramped scale for larger values, then it follows

1. square law
2. logarithmic law
3. uniform law
4. none of the above

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38. If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is

1. 10°
2. 80°
3. 120°
4. 170°

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39. In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be

1. unity
2. 0.5
3. 0.3
4. zero

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40. In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was

1. unity
2. 0.8 lagging
3. 0.8 leading
4. zero

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