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Measurement and Instrumentation

Measurement and Instrumentation
What is the approximate input impedance of a CRO?

 100 MΩ
 1 MΩ
 10 MΩ
 0

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Measurement and Instrumentation
To measure high frequency currents, we mostly use ______ ammeter.

Thermocouple
Moving iron
Dynamometer
Hot wire

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Measurement and Instrumentation
Wagner earthing device is used to eliminate errors due to

None of these
Electromagnetic coupling
Both A and B
Electrostatic coupling

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

 Environmental errors
 Systematic errors
 Random errors
 Gross errors

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Measurement and Instrumentation
A Lissajous pattern on an oscilloscope has 5 horinzontal tangencies and 2 vertical tangencies. The frequency of horizontal input is 100 Hz. The frequency of the vertical will be

 400 Hz.
 250 Hz.
 625 Hz.
 500 Hz.

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Measurement and Instrumentation
In a CRO which of following is not a part of electron gun?

 Grid
  X-Y plates
 Accelerating anode
 Cathode

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