1. What is flywheel?
A flywheel is a heavy body rotating about its axis. It acts as a reservoir of energy which is stored in the form of
kinetic energy. The extra energy is stored during the idle stroke of the driven machinery and released during the
working stroke. Thus, flywheel controls the fluctuations of speed during each cycle of the driven machinery.
2. What are the functions of flywheel in a machine?
The primary function of a flywheel is:
a. To absorb energy when demand of energy id less than the supply
b. To give out energy when demand of energy is more than the supply.
3. What types of stresses are set up in the flywheel rims?
a. Tensile stress due to the centrifugal force
b. Tensile bending stress due to restraint of the arms
c. Shrinkage stresses due to the unequal rate of cooling of casting.
4. What are the various types of flywheels?
a. Solid disc type
b. Rimmed type with either arms or solid web
Solid disc type flywheel is rarely used because they have less capacity of storing energy.
Rimmed type flywheels with arms are preferred because they can store more energy. Small rimmed type
flywheels are manufactured with solid web or holes drilled in the web.
5. Why flywheels are used in punching machines?
Use of flywheel in punching machine is due to the following reasons:
a. It decreases the variation of speed during each cycle of punching machine.
b. It decreases the fluctuation of speed due to difference in output and input
c. It stores energy during idle stroke and releases during working stroke.
6. Why flywheel is used in IC engines?
In IC engine or stem engine the energy is developed during the power stroke, no energy is developed during
suction, compression and exhaust strokes in 4 stroke engines. It helps the crank shaft to run at uniform speed by
performing its primary function
7. What is the difference in the function of governor and a flywheel?
Governor regulates the mean speed of an engine when there are variations in load by changing the supply of
working fluid. Flywheel does not maintain a constant speed. It reduces the fluctuations.
8. Coefficient of fluctuation of speed is ———— of maximum fluctuation of speed and the mean speed
Ratio
9. Due to centrifugal forces acting on the rim, the flywheel arms will be subjected to ————- stresses
Tensile
10. Why flywheel arm is usually elliptical?
This shape helps in more section modulus for the dame weight. This results in more strength than circular
section
A flywheel is a heavy body rotating about its axis. It acts as a reservoir of energy which is stored in the form of
kinetic energy. The extra energy is stored during the idle stroke of the driven machinery and released during the
working stroke. Thus, flywheel controls the fluctuations of speed during each cycle of the driven machinery.
2. What are the functions of flywheel in a machine?
The primary function of a flywheel is:
a. To absorb energy when demand of energy id less than the supply
b. To give out energy when demand of energy is more than the supply.
3. What types of stresses are set up in the flywheel rims?
a. Tensile stress due to the centrifugal force
b. Tensile bending stress due to restraint of the arms
c. Shrinkage stresses due to the unequal rate of cooling of casting.
4. What are the various types of flywheels?
a. Solid disc type
b. Rimmed type with either arms or solid web
Solid disc type flywheel is rarely used because they have less capacity of storing energy.
Rimmed type flywheels with arms are preferred because they can store more energy. Small rimmed type
flywheels are manufactured with solid web or holes drilled in the web.
5. Why flywheels are used in punching machines?
Use of flywheel in punching machine is due to the following reasons:
a. It decreases the variation of speed during each cycle of punching machine.
b. It decreases the fluctuation of speed due to difference in output and input
c. It stores energy during idle stroke and releases during working stroke.
6. Why flywheel is used in IC engines?
In IC engine or stem engine the energy is developed during the power stroke, no energy is developed during
suction, compression and exhaust strokes in 4 stroke engines. It helps the crank shaft to run at uniform speed by
performing its primary function
7. What is the difference in the function of governor and a flywheel?
Governor regulates the mean speed of an engine when there are variations in load by changing the supply of
working fluid. Flywheel does not maintain a constant speed. It reduces the fluctuations.
8. Coefficient of fluctuation of speed is ———— of maximum fluctuation of speed and the mean speed
Ratio
9. Due to centrifugal forces acting on the rim, the flywheel arms will be subjected to ————- stresses
Tensile
10. Why flywheel arm is usually elliptical?
This shape helps in more section modulus for the dame weight. This results in more strength than circular
section
