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Measurement and Instrumentation

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

50Hz
1kHz
500Hz
100Hz

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Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured I1 = 150 ± 3A , I2 = 250 ± 4 A, where the limits of error are given as standard deviations. I is measured as

 (400 ± 3) A
 (400 ± 2.24) A
 (400 ± 1) A
 (400 ±5) A

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Measurement and Instrumentation
The errors introduced by an instrument fall in which category ?

 Environmental errors
 Gross errors
 Random errors
 Systematic errors

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Measurement and Instrumentation
An Ohmmeter is a

None of the listed here
Moving iron instrument
Moving coil instrument
Dynamometer instrument

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Measurement and Instrumentation
In a moving iron meter, the deflecting torque is proportional to

Current through the coil
Sine of the measurand
Squareroot of the measurand
Square of the current through the coil

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Measurement and Instrumentation
A 10MHz CRO has

10MHz vertical oscillator
10MHz supply frequency
5MHz sweep
10MHz horizontal oscillator

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