Flywheel MCQ

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• Find the maximum fluctuation of energy of the flywheel with mass moment of inertia 2000 kg – m2, maximum and minimum angular speed are 15 rad/s, 10 rad/s respectively.
  ক

  125 kN – m

  খ

  120 kN – m

  গ

  123 kN – m

  ঘ

  124 kN – m
• Find the rim mean radius of the flywheel, given mass of the flywheel – 200 kg, angular velocity – 40 rad/s, coefficient of fluctuation of speed – 0.5 and maximum fluctuation of energy – 10 kN – m.
  ক

  0.25 m

  খ

  0.30 m

  গ

  0.50 m

  ঘ

  0.45 m
• Find the coefficient of steadiness of a flywheel with maximum and minimum speed of the flywheel is 200 rpm and 150 rpm respectively.
  ক

  3.5

  খ

  3.01

  গ

  3.99

  ঘ

  3.10
• What happens to the speed of the flywheel while releasing energy?
  ক

  Increases

  খ

  Doubles

  গ

  Decreases

  ঘ

  Quadruples
• What is the maximum fluctuation of speed in a flywheel?
  ক

  N1 – N2

  খ

  N1 + N2

  গ

  N2 – N1

  ঘ

  N1 / N
• Find the energy in the flywheel having maximum fluctuation of energy 20 kN – m and coefficient of fluctuation of speed 0.20.
  ক

  50 kN – m

  খ

  55 kN – m

  গ

  60 kN – m

  ঘ

  65 kN – m
• Find the mass of the flywheel having a radius of gyration 1.5 m, angular velocity 10 rad/s, coefficient of fluctuation of speed 0.10 and maximum fluctuation of energy 15 kN – m.
  ক

  650 kg

  খ

  666 kg

  গ

  645 kg

  ঘ

  630 kg
• What is known as the reciprocal of the coefficient of fluctuation of speed?
  ক

  Coefficient of steadiness

  খ

  Coefficient of speed

  গ

  Coefficient of energy

  ঘ

  Coefficient of torque
• Find the coefficient of fluctuation of speed of a flywheel with a maximum speed of 180 rpm and a minimum speed of 160 rpm.
  ক

  0.1176

  খ

  0.2332

  গ

  0.3569

  ঘ

  0.6325
• What is the coefficient of fluctuation of speed in a flywheel?
  ক

  N1 – N2 / N

  খ

  N / N1 – N2

  গ

  N / N1 + N2

  ঘ

  N1 + N2 / N
• What happens to the speed of the flywheel while absorbing energy?
  ক

  Increases

  খ

  Decreases

  গ

  Double

  ঘ

  Quadruple
• What is the purpose of a flywheel in an engine?
  ক

  For energy – storing

  খ

  For steering

  গ

  For power – producing

  ঘ

  For governing speed
• The flywheel stores the potential energy.
  ক

  True

  খ

  False
• The steam engine has a flywheel which is having a radius of gyration of 1.1 m and mass of 2200 kg. The starting torque is 1550 Nm and assumed constant. What is the angular acceleration of the flywheel?
  ক

  0.54 rad/s2

  খ

  0.58 rad/s2

  গ

  0.62 rad/s2

  ঘ

  0.52 rad/s2
• In the single-cylinder, single acting, four-stroke gas engine, the total fluctuation of speed is not to exceed ±3 percent of the mean speed. What is the coefficient of fluctuation of speed?
  ক

  0.04

  খ

  0.03

  গ

  0.09

  ঘ

  0.06
• Which of the following is the expression of the maximum fluctuation of energy in a flywheel where I = mass moment of inertia of the flywheel, Cs = coefficient of fluctuation of speed, ω = mean angular speed of ω1 and ω2, and E = mean kinetic energy of the flywheel?
  ক

  I*ω*(ω1+ω2)

  খ

  I*ω*Cs

  গ

  2*E2*Cs

  ঘ

  I*ω2*Cs
• What is the coefficient of fluctuation of speed?
  ক

  The ratio of the maximum fluctuation of speed to the mean speed

  খ

  The ratio of the maximum fluctuation of energy to the mean speed

  গ

  The ratio of the minimum fluctuation of energy to the mean speed

  ঘ

  The ratio of the work done per cycle to the mean speed
• Given that maximum fluctuation of energy is 2000 N-m/s and coefficient of fluctuation of speed is 0.02. What is the mean kinetic energy of flywheel?
  ক

  50 kN-m/s

  খ

  40 kN-m/s

  গ

  30 kN-m/s

  ঘ

  20 kN-m/s
• Which of the following is true about the flywheel?
  ক

  Flywheel regulates speed over a period of time

  খ

  Flywheel takes care of the quantity of fluid

  গ

  Flywheel controls \(\frac{dN}{dt}\)

  ঘ

  Flywheel regulates the speed by regulating the quantity of charge of the prime mover
• What is the maximum fluctuation of energy?
  ক

  It is the sum of maximum and minimum energies

  খ

  It is the ratio of the maximum and minimum energies

  গ

  It is the ratio of the mean resisting torque to the work done per cycle

  ঘ

  It is the difference between the maximum and minimum energies
• For a certain engine having an average speed of 1200 rpm, a flywheel approximated as a solid disc, is required for keeping the fluctuation of speed within 2% about the average speed. The fluctuation of kinetic energy per cycle is found to be 2 kJ. What is the least possible mass of the flywheel if its diameter is not to exceed 1 m ?
  ক

  40 kg

  খ

  51 kg

  গ

  62 kg

  ঘ

  73 kg
• The speed of an engine varies from 210 rad/s to 190 rad/s. During the cycle the change in kinetic energy is found to be 400 Nm. The inertia of the flywheel in kg/m2 is
  ক

  0.10

  খ

  0.20

  গ

  0.30

  ঘ

  0.40
• A circular solid disc of uniform thickness 20 mm, radius 200 mm and mass 20 kg, is used as a flywheel. If it rotates at 600 rpm, the kinetic energy of the flywheel, in Joules is
  ক

  395

  খ

  790

  গ

  1580

  ঘ

  3160
• The flywheel of a machine having weight of 4500 N and radius of gyration of 2 m has cyclic fluctuation of speed from 125 r.p.m to 120 r.p.m. Assuming g = 10m/s2, the maximum fluctuation of energy is
  ক

  12822 N-m

  খ

  24200 N-m

  গ

  14822 N-m

  ঘ

  12100 N-m
• The ratio of maximum fluctuation of speed to the mean speed is called
  ক

  fluctuation of energy

  খ

  maximum fluctuation of energy

  গ

  coefficient of fluctuation of speed

  ঘ

  none of the mentioned
• If the rotating 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 energy stored in the latter at the same speed will be
  ক

  four times the first one

  খ

  same as the first one

  গ

  one fourth of the first one

  ঘ

  one and a half times the first one
• A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by
  ক

  2WCE/CS

  খ

  WCE/2CS

  গ

  WCE/CS

  ঘ

  WCS/2CE
• Maximum fluctuation of energy in a flywheel is equal to
  ক

  Iω(ω1 – ω2)

  খ

  Iω2CS

  গ

  2ECS

  ঘ

  all of the mentioned
• The ratio of maximum fluctuation of energy to the workdone per cycle is called
  ক

  fluctuation of energy

  খ

  maximum fluctuation of energy

  গ

  coefficient of fluctuation of speed

  ঘ

  none of the mentioned
• The co-efficient of fluctuation of energy is the ratio of maximum energy to the minimum energy.
  ক

  True

  খ

  False