Page 302 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

two different equipment or systems. Let the comparing two refrigerators: one with an Energy Star rating and one
without. Relative efficiency will be calculated by comparing the energy consumption of two refrigerators for the
same cooling capacity metric.
This measurement helps to understand which system is more effective or productive than the other.
Measurement of Air Consumption: It refers to the amount of air used by an appliance or system. Can be
measured in various units such as litres per minute cubic feet per minute or cubic meters per hour. Air consumption
is often an important parameter for pneumatic devices such as air compressors.
For Example: In the case of pneumatic tools such as air drills or impact wrenches, air consumption is measured
in terms of the amount of air required to maintain their operating pressure and flow rate during use. It helps to
avoid wastage of compressed air as well as select the right size of air compressor and other equipment to meet
the demand.
Measurement of Lubrication Oil Consumption: This measurement is particularly relevant in the context of
machinery, engines and equipment that require lubrication to reduce friction and wear between moving parts.
Lubricating oil consumption can be measured in different units such as litres, gallons or barrels depending on the
volume and duration of use. By accurately measuring lubricating oil consumption, operators can ensure efficient
operation and longevity of machinery and equipment, and reduce maintenance costs.

Dynamometers and its types

Objectives: At the end of this lesson you shall be able to

• differentiate types of dynamometers.

Dynamometer: Dynamometers are devices used to measure force, torque, or power. They come in various
types, including hydraulic, electric, and eddy current dynamometers, each suited to different applications like
engine testing or material strength analysis.
Types of dynamometer
1 Engine Dynamometers: These measure the torque and power output of an engine.
2 Chassis Dynamometers: Used for measuring the power and torque of a vehicle’s wheels, simulating real-
world conditions.
3 Hydraulic Dynamometers: These use hydraulic fluid to apply resistance, measuring force or torque.
4 Eddy Current Dynamometers: These use electromagnetic induction to provide resistance, often used in
automotive testing.
5 Towing Dynamometers: Used for measuring the pulling force of vehicles or other machinery.
6 Absorption Dynamometers: Absorb and measure power by dissipating it as heat, water, or air resistance.
7 Torsion Dynamometers: Measure torque by twisting a calibrated shaft.
8 Electric Dynamometers: Employ an electric motor to apply resistance, often used in automotive testing.
9 Prony Brake Dynamometers: Apply friction to a rotating shaft to measure torque and power.

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CITS : Automotive - Mechanic Diesel - Lesson 87 CITS : Automotive - Mechanic Diesel - Lesson 87