Mechanical Engineering Exam > Mechanical Engineering Videos > Construction and Working of Prony Brake Dynamometer, TOM, Mechanical Engineering, GATE
Construction and Working of Prony Brake Dynamometer, TOM, Mechanical Engineering, GATE Video Lecture
FAQs on Construction and Working of Prony Brake Dynamometer, TOM, Mechanical Engineering, GATE Video Lecture
| 1. What is a Prony brake dynamometer and how does it work? |  |
Ans. A Prony brake dynamometer is a type of dynamometer used to measure the power output of an engine or motor. It works by applying a load to the engine or motor shaft and measuring the resulting torque. The load is applied using a brake system that consists of an adjustable friction pad pressed against the rotating shaft. The torque is measured by the force exerted on the friction pad and the distance from the center of the shaft.
| 2. What are the main components of a Prony brake dynamometer? | |
Ans. The main components of a Prony brake dynamometer include a friction pad, a lever arm, a force measuring device (such as spring or hydraulic load cell), a torque measuring device (such as a strain gauge or dynamometer), and a power measurement device (such as an electrical generator or tachometer). The friction pad is pressed against the rotating shaft, and the force and torque are measured by the respective measuring devices.
| 3. How is a Prony brake dynamometer calibrated? | |
Ans. A Prony brake dynamometer can be calibrated by applying known loads to the engine or motor and measuring the resulting torque. The known loads can be applied using calibrated weights or known electrical power inputs. The torque measurement can be validated by comparing it with a reference dynamometer or by using a known torque source. The calibration process ensures accurate and reliable measurements of power output.
| 4. What are the advantages of using a Prony brake dynamometer? | |
Ans. Some advantages of using a Prony brake dynamometer include its simplicity, cost-effectiveness, and versatility. It can be easily constructed and requires relatively low maintenance. It can be used for a wide range of power measurements, making it suitable for various applications. Additionally, it provides a direct measurement of power output, allowing for real-time monitoring and analysis.
| 5. What are the limitations of a Prony brake dynamometer? | |
Ans. Despite its advantages, a Prony brake dynamometer also has some limitations. One limitation is the heat generated during operation, which can affect the accuracy of measurements. The friction pad and shaft may require cooling systems to dissipate the heat. Another limitation is the limited range of torque measurements, as the maximum torque that can be applied is limited by the strength of the friction pad and the lever arm. Additionally, the friction between the pad and the shaft can cause wear and tear over time, requiring periodic maintenance and replacement.
Text Transcript from Video
Hello friends in this video. I will help you understand
What is Prony Brake dynamometer with its construction and how it works also? [I] will give you all the formula of power
Which we can calculate by [using] prony brake dynamometer
So here. I am having the diagram of a prony brake dynamometer
It consists of a pulley which is attached to this shaft as we can see here at the centre. We [are] having a shaft
This Shaft is
The shaft whose power is what we want to measure
We want to measure the power of the shaft so for that
We are mounting a brake drum or you can say pulley over this shock
next
Here we are having wooden blocks
Which are mounted just above the pulley?
[NutS-And-Bolts] arrangement are also provided so that we can adjust the gap between the wooden blocks and the drum here
next we are having a lever as
We can see from the centre of the shaft
To the point at which [we] are applying the load this W indicates the load which we apply
So from the centre of shaft to the load here. We call it as L. Which is the length of the lever consider
Stoppers are provided to stop or
Restrict the motion of the lever from going to extreme condition that is lever should not move in Extreme downward or upward Direction
Then we are having counterweight to avoid the vibrations of the lever
so this was regarding the construction now how it functions see prony brake dynamometer is a type of
absorption dynamometer
because it stops the shaft and then measures the power so here I can say that prony brake Dynamo meters
They are [off] absorption time
So how it functions at first the shaft is rotating we have mounted the breakdown
So this brain [commode] pulley will also rotate here. It is given anti clock, so it will rotate in 90 Clockwise Direction
We will be attaching weights here once we attach weight here the lever would be moving in the downward
Direction along with that the clamp the wooden clamps or wooden blocks
They would be moving down this upper block would be moving down so the moment
We are attaching we are going on increasing the value of load here the wooden blocks
They come closer to the brake drum and once the load value has reached up to a value where it will be
just coming in contact with the brake drum the brake drum stops and
When the brake drum stops at that time we will be
Noting the value of w. How much is the load here and what is the length of this lever?
So power is calculated it is given by the formula 2 Pi n by 60
into W into L for rubric Dynamometer
where w is a load which we are attaching at the end of the lever and
L is the length of the lever so in this way we will be measuring power by Prony Brake dynamometer
What is Prony Brake dynamometer with its construction and how it works also? [I] will give you all the formula of power
Which we can calculate by [using] prony brake dynamometer
So here. I am having the diagram of a prony brake dynamometer
It consists of a pulley which is attached to this shaft as we can see here at the centre. We [are] having a shaft
This Shaft is
The shaft whose power is what we want to measure
We want to measure the power of the shaft so for that
We are mounting a brake drum or you can say pulley over this shock
next
Here we are having wooden blocks
Which are mounted just above the pulley?
[NutS-And-Bolts] arrangement are also provided so that we can adjust the gap between the wooden blocks and the drum here
next we are having a lever as
We can see from the centre of the shaft
To the point at which [we] are applying the load this W indicates the load which we apply
So from the centre of shaft to the load here. We call it as L. Which is the length of the lever consider
Stoppers are provided to stop or
Restrict the motion of the lever from going to extreme condition that is lever should not move in Extreme downward or upward Direction
Then we are having counterweight to avoid the vibrations of the lever
so this was regarding the construction now how it functions see prony brake dynamometer is a type of
absorption dynamometer
because it stops the shaft and then measures the power so here I can say that prony brake Dynamo meters
They are [off] absorption time
So how it functions at first the shaft is rotating we have mounted the breakdown
So this brain [commode] pulley will also rotate here. It is given anti clock, so it will rotate in 90 Clockwise Direction
We will be attaching weights here once we attach weight here the lever would be moving in the downward
Direction along with that the clamp the wooden clamps or wooden blocks
They would be moving down this upper block would be moving down so the moment
We are attaching we are going on increasing the value of load here the wooden blocks
They come closer to the brake drum and once the load value has reached up to a value where it will be
just coming in contact with the brake drum the brake drum stops and
When the brake drum stops at that time we will be
Noting the value of w. How much is the load here and what is the length of this lever?
So power is calculated it is given by the formula 2 Pi n by 60
into W into L for rubric Dynamometer
where w is a load which we are attaching at the end of the lever and
L is the length of the lever so in this way we will be measuring power by Prony Brake dynamometer
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