A sampling wattmeter is used to measure the average power of a load. The peak to peak voltage of a square wave is 10 V and the current is triangular wave of 5 Amp P-P as shown in the figure. The period is 20 ms. The reading in W will be

Measurement and Instrumentation
A sampling wattmeter is used to measure the average power of a load. The peak to peak voltage of a square wave is 10 V and the current is triangular wave of 5 Amp P-P as shown in the figure. The period is 20 ms. The reading in W will be

0 W.

50 W.

100 W.

25 W.

0 W.

50 W.

100 W.

25 W.

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Measurement and Instrumentation
With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be

500Hz

50Hz

100Hz

1kHz

500Hz

50Hz

100Hz

1kHz

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Measurement and Instrumentation
A variable w is related to three other variables x, y and z as w = xy/z. The variables are measured with meters of accuracy ± 0.5% reading, ± 1% of full scale value and ± 1.5% reading. The actual readings of the three meters are 80, 20 and 50 with 100 being the full scale value for all three. The maximum uncertainty in the measurement of w will be

± 7%

± 8%

± 5%

± 6%

± 7%

± 8%

± 5%

± 6%

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Measurement and Instrumentation
The terminals across the source are ______________________________ if a current source is to be neglected.

replaced by a source resistance

short circuited

replaced by a capacitor

open circuited

replaced by a source resistance

short circuited

replaced by a capacitor

open circuited

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Measurement and Instrumentation
Why is a MISC meter not recommended for DC measurement?

The meter is calibrated for AC and it’s error for DC would be high

The error is high due to eddy current effect

The error is high due to hysteresis effect

The meter does not respond to DC signals

The meter is calibrated for AC and it’s error for DC would be high

The error is high due to eddy current effect

The error is high due to hysteresis effect

The meter does not respond to DC signals

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Measurement and Instrumentation
Some wire- wound resistors have bifilar winding. This type of winding is used to

Double the power rating of the resistor

Reduce the tolerance

Reduce the inductance of winding

Increase the thermal stability

Double the power rating of the resistor

Reduce the tolerance

Reduce the inductance of winding

Increase the thermal stability

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Measurement and Instrumentation

Measurement and Instrumentation A sampling wattmeter is used to measure the average power of a load. The peak to peak voltage of a square wave is 10 V and the current is triangular wave of 5 Amp P-P as shown in the figure. The period is 20 ms. The reading in W will be

Measurement and Instrumentation With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be

Measurement and Instrumentation The terminals across the source are ______________________________ if a current source is to be neglected.

Measurement and Instrumentation Why is a MISC meter not recommended for DC measurement?

Measurement and Instrumentation Some wire- wound resistors have bifilar winding. This type of winding is used to

Measurement and Instrumentation
A sampling wattmeter is used to measure the average power of a load. The peak to peak voltage of a square wave is 10 V and the current is triangular wave of 5 Amp P-P as shown in the figure. The period is 20 ms. The reading in W will be

Measurement and Instrumentation
With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be

Measurement and Instrumentation
The terminals across the source are ______________________________ if a current source is to be neglected.

Measurement and Instrumentation
Why is a MISC meter not recommended for DC measurement?

Measurement and Instrumentation
Some wire- wound resistors have bifilar winding. This type of winding is used to