ECE · all questions

Measurement And Instrumentation
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Q161

Inductance of a coil having Q value in the range of (1 < Q < 10), can be measured by using

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Q162

LVDT is a

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Q163

Which one of the following multi range voltmeters has high and constant input impedance

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Q164

Measurement of an unknown voltage with a dc potentiometer loses its advantage of open-circuit measurement when

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Q165

Potentiometer method of dc voltage measurement is, in principle, more accurate than direct measurement of a voltage using voltmeter because.

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Q166

Current passing through a resistor of 100 ± 0.2Ω is 2.00 ± 0.01 A. Computed value of power will be

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Q167

The current flowing in a 20 Ω resistor is given by i = 2 + 4 sin 314t. This current is measured by a hot wire ammeter. What is the measured value?

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Q168

Which type of wattmeter cannot be used for D.C.?

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Q169

The voltage (E₀) developed across a glass electrode for pH measurement is related to the temperature (T) by the relation

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Q170

In binary data transmission DPSK is preferred to PSK because

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Q171

A voltmeter having a sensitivity of 1000 Ω/V reads 100 V on its 150 V scale when connected across at resistor of unidentified specifications in series with a milliammeter. When the milliammeter reads 5 mA, the error due to the loading effect of the voltmeter will be nearly

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Q172

A digital displacement indicator based on a linear voltage differential transformer (LVDT) transducer and A/D conversion used a LVDT with a sensitivity of 1 mV/mm. If the smallest displacement to be measured is 0.1 mm and the maximum displacement of the LVDT core is 10 cm, then the digital display required for the instrument has to be

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Q173

The study of energy distribution across the frequency spectrum of a given electrical signal is done by a

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Q174

The function of the dummy strain gauge, in measurement using two strain gauge, is to

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Q175

Harmonic distortion analyzer

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Q176

The value of n for the n-bit A/D converter required to convert an analog input in the range of 0 to 5 volts to an accuracy of 10 mV is:

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Q177

For the recording of very fast random signals, the most suitable instrument would be

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Q178

The sensitivity of a potentiometer can be increased by

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Q179

Consider the following types of digital voltmeters:
1. Ramp type
2. Dual slope integrating type
3. Integrating type using voltage to frequency conversion
4. Successive approximation type
5. Servo balanced potentiometer type
Which of these require a fixed reference voltage at the comparator stage?

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Q180

Q factor of Quartz . . . . . . . .

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