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Questions and Answers
What is the primary purpose of a torque measuring device?
What is the primary purpose of a torque measuring device?
Which dynamometer type is specifically used to measure power or torque developed by engines and motors?
Which dynamometer type is specifically used to measure power or torque developed by engines and motors?
What does the equation $T = F imes R$ represent in torque measurement?
What does the equation $T = F imes R$ represent in torque measurement?
Which factor is NOT a parameter that determines the capacity of a hydraulic dynamometer?
Which factor is NOT a parameter that determines the capacity of a hydraulic dynamometer?
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In a Mechanical Dynamometer (Prony Brake), what component is used to increase frictional resistance?
In a Mechanical Dynamometer (Prony Brake), what component is used to increase frictional resistance?
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What type of dynamometer provides energy to operate the device being tested?
What type of dynamometer provides energy to operate the device being tested?
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Which characteristic is associated with a hydraulic dynamometer?
Which characteristic is associated with a hydraulic dynamometer?
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What is typically a primary application of hydraulic dynamometers?
What is typically a primary application of hydraulic dynamometers?
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Study Notes
Torque
- Force that causes twisting or turning moment.
- Example: Force generated by an internal-combustion engine to rotate a vehicle's drive shaft.
- Measured using dynamometers.
Formula
- T=F⋅RT = F\cdot RT=F⋅R in N-m
- F=T/RF = T/RF=T/R
- where:
- TTT is the torque
- FFF is the force at a known radius
- rrr is the radius
Types of Dynamometers
- Absorption Dynamometers: Measure the power or torque developed by a power source such as engines and electric motors.
- Driving Dynamometers: Measure power or torque; they also provide energy to the tested device. They are used to determine performance characteristics of devices like pumps and compressors.
- Transmission Dynamometers: Passive devices placed to measure torque at a specific location in a machine.
Mechanical Dynamometer (Prony Brake)
- Consists of wooden cleats or blocks mounted on a flywheel attached to the rotating shaft.
- Torque exerted by the Prony brake is T=F⋅LT = F\cdot LT=F⋅L
Hydraulic Dynamometer
- Uses fluid friction to dissipate input energy, measuring input torque or power.
- Capacity is dependent on speed and water level.
- Torque is measured using a reaction arm or shaft.
- Power absorption can be controlled by adjusting water level.
Hydraulic Dynamometer Characteristics
- Small size: Easy installation
- Simple structure: Easy maintenance
- High brake torque: N/A
- High measurement accuracy: N/A
- Reliable and stable working condition: N/A
- Accurate real-time speed measurement with EM sensors: N/A
- Fast loading control by electronic-control butterfly valve: N/A
- High reaction speed: Suitable for dynamic testing
- Typical applications: Tuning engines at service centers or for racing applications
Torque Measurement and Mechanical Power
- Torque measurement can be used to determine:
- Power needed to operate a machine
- Power developed by the machine
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Description
This quiz explores the concept of torque, including its definition, formula, and various types of dynamometers used to measure torque in mechanical systems. It's a great resource for anyone studying mechanical engineering or physics. Test your knowledge on how torque is applied in real-world scenarios and the equipment used for measurement.
