Measurement and Instrumentation
The pressure coil of a wattmeter should be connected on the supply side of the current coil when

None of these
Supply voltage is low
Load impedance is high
Load impedance is low

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Measurement and Instrumentation
The time/div and voltage axes of an oscilloscope have been creased. A student connects a 1 KHz, 5 V P-P square wave calibrition pulse to channel-1 of the scope and observes the screen to be as shown in the upper trace of figure. An unknown signal is connected to channel-2 (lower trace) of the scope. If the time/div and V/div on both channels are the same, the amplitude (P-P) and period of the unknown signal are respectively

  7.5 V, 2 ms.
 10 V, 1 ms.
 5 V, 1 ms.
 5 V, 2 ms.

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