Measuring Waveform Voltage and Frequency with a CRO

Posted by on May 1, 2026 in Electromechanical Engineering | 0 comments

Experiment 1: Waveform Measurement

Aim: To measure the voltages and frequency of different waveforms using a Cathode Ray Oscilloscope (CRO).

Apparatus: Cathode Ray Oscilloscope (CRO), function generator, BNC connector, and connecting wires.

Theoretical Background

Cathode Ray Oscilloscope (CRO)

The Cathode Ray Oscilloscope (CRO) is a common laboratory instrument that provides accurate time and amplitude measurements of voltage signals over a wide range of frequencies. Its reliability, stability, and ease

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Internal leakage in

Posted by on Apr 7, 2026 in Electromechanical Engineering | 0 comments

8 Explain the working principle of Ultrasonic Testing (UT). Describe the differences between The Pulse-Echo Method and the Transmission Method in UT.

Working Principle of Ultrasonic Testing (UT)


 The fundamental principle of UT involves the use of high-frequency sound waves (ultrasonic vibrations) to probe the internal structure of a material.

Generation:


A pulser sends high-voltage electrical pulses to a transducer.

Conversion:


The transducer, containing piezoelectric crystals, converts this electrical

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Essential Metrology and Measurement Systems Explained

Posted by on Apr 7, 2026 in Electromechanical Engineering | 0 comments

1. Instruments for Angular Measurement

The following four instruments are commonly used for angular measurement:

  • Bevel Protractor: Used for measuring angles between two surfaces with a vernier scale.
  • Sine Bar: Used in conjunction with slip gauges to measure angles accurately based on trigonometry.
  • Angle Gauges: Hardened steel blocks of precise angles used as reference standards.
  • Clinometer: A specialized version of a spirit level used for measuring angles of inclination or slope.

2. Measuring Component

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Engineering Metals and Alloys in Construction

Posted by on Apr 6, 2026 in Electromechanical Engineering | 0 comments

Q1. Short Notes (5 Marks Each)

Copper Alloys and Their Properties

Copper alloys are formed by mixing copper with other metals to improve strength, corrosion resistance, and workability.

  • Brass (Cu + Zn): Good corrosion resistance and ductile. Used in fittings, sheets, and decorative items.

  • Bronze (Cu + Sn): Harder and stronger than brass. Used in bearings and statues.

  • Gunmetal (Cu + Sn + Zn): Highly resistant to corrosion and wear. Used in valves and pipes.

  • Cupronickel (Cu + Ni): High resistance to seawater

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Essential Electrical Engineering Exam Questions and Answers

Posted by on Apr 3, 2026 in Electromechanical Engineering | 0 comments

Essential Electrical Engineering Exam Q&A

Here are detailed answers in English for all questions (exam-ready) 📘✍️

Q1. Difference Between AC and DC Supply

AC (Alternating Current) Supply: Alternating current is the type of electrical supply in which the magnitude and direction of current change periodically with time. The waveform of AC is usually sinusoidal. AC is used for power transmission because it can be easily stepped up or stepped down using transformers.

Characteristics of AC

  • Direction
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DC Machine Fundamentals: Construction and Working Principles

Posted by on Apr 2, 2026 in Electromechanical Engineering | 0 comments

What Is a DC Machine?

A DC machine is an electromechanical energy conversion device. Its working principle is based on the interaction between electric current flowing through a coil and a magnetic field, which generates a torque that rotates the DC motor. DC machines are classified into two primary types: DC generators and DC motors.

Construction of a DC Machine

Yoke

Also known as the frame, the yoke provides mechanical support for the poles and protects the internal components from moisture, dust,

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