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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Which meter is used for alignment?
Mercury meter
Level gauge
Coupling
Gauge wire
Level gauge
Quick Summary: A level gauge (specifically a precision spirit level or optical alignment tool) is used in electrical and mechanical engineering to ensure that rotating machinery, such as motors and generators, are perfectly aligned on their bedplates. Proper alignment is critical to prevent excessive vibration, bearing failure, and premature mechanical wear.
A level gauge (specifically a precision spirit level or optical alignment tool) is used in electrical and mechanical engineering to ensure that rotating machinery, such as motors and generators, are perfectly aligned on their bedplates. Proper alignment is critical to prevent excessive vibration, bearing failure, and premature mechanical wear.
Angle=tan−1(LΔx) — Formula for calculating angular misalignment
Offset=x2+y2 — Resultant radial alignment error
The principle involves establishing a reference horizontal or vertical plane. In spirit levels, a liquid-filled vial containing a bubble indicates deviation from true level. For precision alignment in industrial power systems, laser alignment tools or dial indicators are often used in conjunction with leveling gauges to measure the relative offset and angular misalignment between the motor shaft and the load shaft.
Alignment prevents excessive torque stress on shaft couplings.
Misalignment leads to increased power consumption due to mechanical friction.
Laser-based alignment systems are replacing traditional spirit level gauges for high-precision turbine and generator applications.
Reduces vibration and noise in rotating machines.
Extends the lifespan of bearings and shaft seals.
Improves overall electrical efficiency of the drive system.
Requires periodic calibration to maintain accuracy.
Manual levels can be sensitive to environmental vibrations during measurement.
Installation of large electric motors.
Alignment of steam/gas turbines in power plants.
Commissioning of pumps and compressors.
Proper alignment is typically defined within tolerances of a few micrometers (μm) for high-speed machinery.
Mercury meters are used for measuring flow rate or pressure, not alignment; hence, Option A is incorrect.
B is correct — A level gauge is the essential instrument used to verify the horizontal or vertical alignment of equipment foundations and rotating shafts.
Always ensure the foundation is leveled using a precision level gauge before performing 'soft-foot' checks on electrical machine bedplates.