This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Flywheel”.
1. Is use of a flywheel recommended when a large motor is required only for a small instant of time?
a) True
b) False
View Answer
Explanation: Fly wheel allows the large motor to be replaced by a smaller motor as the peak power is required only for a small instance of time and not through the entire operation.
2. Flywheels are used in punching and shear operation.
a) True
b) False
View Answer
Explanation: Flywheels store the kinetic energy imparted during idle positions and delivers this energy during actual shearing or punching.
3. Which of the following are functions of flywheel?
a) Store and release energy during work cycle
b) Reduce power capacity of the electric motor
c) Reduce amplitude of speed fluctuations
d) All of the listed
View Answer
Explanation: Flywheel provides uniform motion by storing energy during idle positions and using this at actual operational time and thus reducing the power capacity of the electric motor.
4. When comes down to stress reduction, which one is preferred?
a) Solid flywheel
b) Split flywheel
c) Both have equal stresses
d) Cannot be determined
View Answer
Explanation: The arms are free in split flywheel to contract and hence are better for stress reduction.
5. Flywheel and governor can be interchanged.
a) True
b) False
View Answer
Explanation: Flywheel influences cyclic speed fluctuations while governor control mean speed.
6. If load on the engine is constant, the mean speed will be constant and ___ will not operate.
a) Flywheel
b) Governor
c) Both flywheel and governor
d) None of the mentioned
View Answer
Explanation: Governor is used to control the mean speed and if mean speed is held constant then the governor will not operate.
7. The operation of flywheel is continuous.
a) True
b) False
View Answer
Explanation: Flywheel is used to control the fluctuations and thus is continuously working.
8. Which of the following doesn’t waste energy?
a) Flywheel
b) Governor
c) Both flywheel and governor
d) Neither flywheel nor governor
View Answer
Explanation: Flywheel has kinetic energy which is 100% convertible while governor suffer from friction losses.
9. Which of the following is not true for cast iron flywheels?
a) Excellent damping
b) Cheap
c) Given complex shape
d) Sudden failure
View Answer
Explanation: Due to low tensile strength failure is sudden.
10. When the driving torque is more than load torque, flywheel is ______
a) Accelerated
b) Decelerated
c) Constant velocity
d) Can’t be determined
View Answer
Explanation: I[dω/dt]=Driving torque-load torque.
11. The following is a work cycle graph for a flywheel. T₂ is the torque supplied by motor while T₁ and T₃ are the torques required by machine. During the portion AB the flywheel is?
a) Accelerated
b) Decelerated
c) Maintain constant speed
d) None of the listed
View Answer
Explanation: Driving torque is more than the torque supplied by motor.
12. The following is a work cycle graph for a flywheel. T₂ is the torque supplied by motor while T₁ and T₃ are the torques required by machine. During the portion BC the flywheel is?
a) Accelerated
b) Decelerated
c) Maintain constant speed
d) None of the listed
View Answer
Explanation: Driving torque is lesser than the torque supplied by motor.
13. The following is a work cycle graph for a flywheel. T₂ is the torque supplied by motor while T₁ and T₃ are the torques required by machine. The flywheel is accelerated during the
a) AB
b) BC
c) CD
d) Both AB and CD
View Answer
Explanation: Whenever the torque supplied by the motor is greater than the torque needed by machine, flywheel will accelerate.
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