Electrical Engineering Management

23 questions and answers

1365 views

Define the terms accuracy, Precision, Resolution, Drift and Relative limiting error.

Accuracy of measurements mean conformity to truth. It is the closeness with which an instrument reading approaches the truth value of the quantity being measured

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added 2 years ago
1024 views

Explain the difference between Dynamometer type wattmeter and induction type wattmeter.

i. Working torque comparatively weaker. i. Working torque comparatively stronger.

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added 2 years ago
1177 views

Define gauge factor of a strain gauge & obtain its expression.

It is defined as the ratio of per unit change in resistance to per unit change in length. Expression: Gauge factor \(\left(G_f\right)=\frac{\Delta R/R}{\Delta L/L}\)

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added 2 years ago
1057 views

Write short note on LVDT

LVDT works under the principle of mutual induction, and the displacement which is a non-electrical energy is converted into an electrical energy.

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added 2 years ago
1086 views

Write short note on

  • Digital Multimeter
  • Piezoelectric Transducer

While most analog meters require no power supply, give a better visual indication of trends and changes, suffer less from electric noise and isolation problems, and, are simple and inexpensive, digital meters offer higher accuracy and input impedance, unambiguous readings at greater viewing distances, smaller size, and a digital electrical output (for interfacing with external equipment) in addition to visual readout.

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added 2 years ago
1010 views

What are the special features of a high voltage Schering bridge? What is meant by “Wagner’s Earth”?

High voltage supply is obtained from a transformer. Usually at the power frequency and detector used is vibration galvanometer.

1027 views

What is the function of delay time?

The delay Line retards the arrival of the input waveform at the vertical deflection plates until the trigger and time base circuits start the sweep of the beam.

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added 2 years ago
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What are absolute & secondary instruments ? Why is damping required in a measuring instrument ?

These instruments give the magnitude if the quantity under measurement terms of physical constants of the instrument.

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added 2 years ago
1350 views

How can potentiometer be used for

  • Calibration of ammeter
  • Calibration of voltmeter

The ammeter to be calibrated is connected in series with a variable resistance R and a standard resistance S. The standard resistance, S should be such of magnitude that with the current to be passed through it, the voltage drop across it does not exceed the range of the potentiometer.