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MP Sub-Engineer ME: Flywheels Quiz 44
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Question 1
Which of the following diagram is used to study the energy absorbed and released by flywheel in an engine?
Question 2
A circular solid disc of uniform thickness 20 mm, radius 400 mm and mass 10 kg, is used At a flywheel. If it rotates at 300 rpm, the kinetic energy of the flywheel, in joules is ___________.
Question 3
If the rotation mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then the energy stored in the later at the same angular speed will be
Question 4
A flywheel whose moment of inertia is 3000 kg-m2 is attached to a shaft which starts from rest and undergoes a uniform acceleration of 0.5 rad/
. Calculate the kinetic energy (kJ) of the flywheel after 20s from its start?
. Calculate the kinetic energy (kJ) of the flywheel after 20s from its start?Question 5
The crank of a slider-crank punching press has a mass moment of inertia of
. The figure below shows the torque demand per revolution for a punching operation. If the speed of the crank is found to drop from 30 rad/s to 20rad/s during punching, what is maximum torque demand during the punching operation?
. The figure below shows the torque demand per revolution for a punching operation. If the speed of the crank is found to drop from 30 rad/s to 20rad/s during punching, what is maximum torque demand during the punching operation? Question 6
The turning moment diagram for a single cylinder double acting steam engine consists of +ve and –ve loops above and below the average torque line. For the +ve loop, the ratio of the speeds of the flywheel at the beginning and the end is which one of the following?
Question 7
Among the following four designs of a flywheel with given mass M (kg) and external diameter D (m), which is the one with highest energy storage capacity?
Question 8
The flywheel of a machine having weight of 4500N and radius of gyration of 2 m has cyclic fluctuation of speed from 125 r.p.m. to 120 r.p.m. Assuming 
, the maximum fluctuation of energy is
, the maximum fluctuation of energy is Question 9
If the speed of an engine varies between 390 and 410 rpm in a cycle of operation, the coefficient of fluctuations of speed would be:
Question 10
A machine is coupled to a power source. The machine requires constant torque but torque supplied by the power source is (800+200sinθ) N-m. Mass moment of inertia of the flywheel is 400 kg-m2. What is the maximum angular acceleration of the flywheel and at what position does it occur?
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