Measurement and Instrumentation
A metal strain gauge has a gauge factor of two. Its nominal resistance is 120 ohms. If it undergoes a strain of 10-5, the value of change of resistance in response to the strain is

 120 Ohm.
 240 Ohm.
 0.0012 Ohm.
 0.0024 Ohm.

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Measurement and Instrumentation
Which of following is not correct?

 An ammeter should have a very low resitance.
 Voltmeter should have very high resistance.
  An electronic voltmeter draw appreciable current from the source.
 A shunt should have a very low resistance.

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