Measuring Instruments and Bridge Circuits Quiz

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Questions and Answers

What is the main role of meters and measuring instruments in electronics?

Assessing how an electronic circuit is performing (correct)
Storing data about electronic circuits
Determining the color of electronic circuits
Measuring the weight of electronic circuits

Which of the following are fundamental electrical measurements?

Energy, force, and velocity
Temperature, pressure, and speed
Voltage, current, and impedance (correct)
Resistance, power, and frequency

What is the function of a wattmeter?

Monitoring power consumption and managing energy savings (correct)
Counting the number of components in electronic circuits
Measuring temperature in electronic circuits
Testing the speed of electronic components

What type of wattmeters come in analog and digital variants?

Wattmeters (A) Signup and view all the answers

Which instrument is used to measure field strength, stroboscope, and pH?

Q meter (B) Signup and view all the answers

What does a megger meter measure?

Resistance of electrical insulation (C) Signup and view all the answers

What is the main difference between analog and digital meters?

Analog meters use a moving pointer on a calibrated scale, while digital meters provide precise power measurements electronically. (B) Signup and view all the answers

What are the two types of wattmeters mentioned in the text?

Electrodynamometer wattmeter and Induction wattmeter (D) Signup and view all the answers

In an electrodynamometer wattmeter, what carries the load current?

Fixed coil (A) Signup and view all the answers

What is the role of the shunt magnet in the induction type wattmeter?

It carries a current proportional to the supply voltage. (B) Signup and view all the answers

What causes the mechanical force to act between the coils in an electrodynamometer wattmeter?

The reversal of the circuit current reverses the currents in both the current coil and potential coil. (A) Signup and view all the answers

What does the coil of series magnet in induction type wattmeter carry?

Load current (B) Signup and view all the answers

How is the working of induction type wattmeter based?

On the principle of electromagnetic induction (B) Signup and view all the answers

What is placed between the two magnets in an induction type wattmeter?

A thin disc made up of aluminium (C) Signup and view all the answers

What causes a mechanical force to deflect the moving coil and pointer over the scale in electrodynamometer wattmeters?

Due to the currents in the coils, a mechanical force acts between them. (B) Signup and view all the answers

Why can electrodynamometer wattmeters measure power in both AC as well as DC circuits?

As the reversal of the circuit current reverses the currents in both the current coil and potential coil so that the direction of deflecting torque remains unchanged. (C) Signup and view all the answers

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