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Measurement and Instrumentation

Measurement and Instrumentation
In induction type ammeter, _____ damping is provided.

Eaddy current
Fluid friction
None of the listed here
Air friction

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Measurement and Instrumentation
A set of independent current measurements taken by four observers was recorded as : 117.02 mA, 117.11 mA, 117.08 mA and 117.03 mA. What is the range of error ?

 ± 0.065
 ± 0.045
 ± 0.056
 ± 0.054

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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

 625 Hz.
 400 Hz.
 500 Hz.
 250 Hz.

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Measurement and Instrumentation
What is the expression for acceleration?

 Change in velocity / time
 Mass x velocity
 Mass x acceleration
 Force x displacement

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Measurement and Instrumentation
The transfer instrument which is used for standardization of a polar type AC potentiometer is

 a dynamometer instrument.
 a moving coil instrument.
 a thermal instrument.
 an electrostatic instrument.

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Measurement and Instrumentation
The repeat accuracy of an instrument can be judged from its

Standard deviation of error
Dynamic error
Static error
Linearity error

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