ECE :: Measurements and Instrumentation
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The deflection of a DArsonval galvanometer is measured through a mirror and scale. The mirror is 1 m away from the light source. The mirror is mounted on, the moving system. If mirror rotates through 0.2 rad the displacement on the scale is
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Two ammeters having resistances of 0.5 Ω and 0.25 Ω and having full scale reading of 25 A each are connected in parallel. To ensure that neither of them goes beyond scale, the total current should not be more than
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A polyphase wattmeter basically consists of two wattmeters. The moving system of two wattmeters
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The dead zone in a pyrometer is 0.125% of span. The calibration is 400°C to 1000°C. What temperature change might occur before it is detected.
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An amplifier has to amplify pulses of 1 H-s duration. The minimum bandwidth of amplifier must be
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A moving coil meter has a resistance of 50 ohms and a full scale deflection current of 20 mA. To convert it into a voltmeter of 0-100 V range, the series resistance should be
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In measuring a resistance by voltmeter-ammeter method, the voltmeter can be connected either across supply or across the resistance. If the resistance is low, the voltmeters should be connected
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Which of the following methods can be used to measure power in a single phase circuit without using wattmeter?
- One voltmeter, one ammeter
- Two voltmeters, two ammeter
- Three voltmeters
- Three ammeters
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For measurement of surface temperature of solids the elements of RTD is usually in the shape of
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or V = 37.5 V.
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