Electrical Engineering

All Q&A

Deduce the expression of torgue of electrodynamometer type instrument. Why multiplier is used with PMMC instrument? What do you mean by sensitivity of PMMC instrument? Why sensitivity of electrodynamometer type instrument is low? Why the scale of moving iron instrument is cramped at lower end?

23 June, 2022

Let e= instantaneous voltage across load =\(E_m\) sin (ωt-φ) \(i_t\) =instantaneous load current

Draw the circuit diagram of DC potentiometer & explain how it works.

23 June, 2022

Let the standard cell SC be connected with its negative terminal through selector switch S, galvanometer G and key K to the sliding contact J. Since slide wire AB is of uniform cross section, the resistance per unit length r will be constant and equal to R/L. Where R is resistance of whole wire and L is the length of wire.

What are absolute & secondary instruments ? Why is damping required in a measuring instrument ?

23 June, 2022

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

A single phase kWhr meter makes 500 revolutions per kWhr. It is found on testing that it is making 40 revolutions in 58.1 seconds at 5kW load. Find out the percentage of error.

23 June, 2022

Energy consumed in 58.1 seconds=\(\frac{5\ast58.1}{3600}\) kWh=0.08069kWh

What is the function of delay time?

23 June, 2022

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.

Write short note on

Digital Multimeter
Piezoelectric Transducer

23 June, 2022

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.

Write short note on LVDT

23 June, 2022

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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