ECE · all questions

Measurement And Instrumentation
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Q261

In a distortion factor meter, the filter at the front end is used to suppress

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Q262

A tachometer encoder can be used for measurement of speed:

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Q263

Hooke's law is written as

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Q264

A rotameter works on the principle of variable:

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Q265

A pulse waveform with a 3.3 kΩ source resistance is to be displayed on an oscilloscope with an input capacitance of 15 pF. The rise time of the pulse shown on the scope is measured as

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Q266

Which errors arise due to the hysteresis of the equipment or due to friction

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Q267

What are the salient features of thermistors?
1. They are compact, rugged and inexpensive
2. They have good stability when properly aged
3. The response time of thermistors can vary from a fraction of a second to minutes, depending on the size of the detecting mass and thermal capacity of the thermistor

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Q268

Which instrument has the highest frequency range with accuracy within reasonable limits?

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Q269

While transporting a sensitive galvanometer

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Q270

What is the dynamic range of a spectrum analyzer with a third order interrupt point of +25 dBm, and a noise level of (-)85 dBm.

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Q271

A 0-250 V voltmeter has guaranteed accuracy of 1% full-scale reading (deflection). The voltage measured by this instrument is 100 V. The limiting error is given by

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Q272

A 0-200 V voltmeter has a sensitivity of 1 kΩ/V. The resistance of the voltmeter is

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Q273

Most common form of A.C. meters met with in every day domestic and industrial installation are

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Q274

Volt Ratio box (VR box) is used in conjuction with

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Q275

The FM telemetry as compared with AM telemetry requires a channel that is

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Q276

Which of the following is correct?

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Q277

Which of the following meters is based on the principle of Hall Effect?

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Q278

Hysteresis error, in moving iron instruments may be reduced by using

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Q279

A thermistor has a resistance temperature coefficient of -2% over a temperature range of 25°C to 50°C. If the resistance is 50 Ω at 25°C. What is the resistance at 45°C ?

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Q280

Consider the following statements associated with electrical/electronic transducers:
1. Mass-inertia effects are minimized
2. These transducers consume very little power
3. The response time is large
4. Transmission and processing the signal for the purpose of measurement are easier
Select the correct answer using the options given below:

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