M1. Flywheel

Question 1

The first derivative of kinetic energy with
respect to velocity is:
A. Acceleration C. Power
B. Momentum D. None of these

Answer 1

B

Question 2

Cast iron flywheels are commonly designed with factor of
safety of ______. (ME BD, AUG. 2017)
A. 10 to 13 C. 10 to 14
B. 10 to 12 D. 8 to 13

Answer 2

A

Question 3

For equalizing energy absorption and exertions in
mechanical work, this part of the machine prevents
excessive change of speed or to regulate work speed.
(ME BD., APR. 2006)
A. Actuator C. Flywheel
B. Bearing D. Shaft

Answer 3

C

Question 4

A rule of thumb, the speed limit of the flywheel rim speed
should be 6,000 fpm for cast iron material and for cast iron
flywheel rim at ______ meters per minute. (ME BD. OCT.
1997)
A. 3,050 C. 7,000
B. 4,500 D. 10,000

Answer 4

D

Question 5

What is the recommended coefficient of
fluctuation of flywheels for punching, shearing, pressing
machine?
A. 0.005-0.1
B. 0.007-0.01
C. 0.03-0.05
D. 0.01-0.03

Answer 5

A

Question 6

Split flywheel is made to ________.
A. Minimize large centrifugal forces
B. Reduce weight of the above
C. Avoid cooling stresses
D. All of the above

Answer 6

C

Question 7

If the load on the engine is constant, the mean speed will
be constant from the cycle, then ________.
A. The governor will not operate but flywheel will be
acting
B. The flywheel will be acting but governor will not
operate
C. Both flywheel and governor will be acting
D. Both flywheel and governor will not be acting

Answer 7

A

Question 8

What is the difference between the maximum and
minimum speeds during a cycle?
A. Fluctuation of speed
B. Maximum fluctuation of speed
C. Coefficient of fluctuation of speed
D. None of the above

Answer 8

B

Question 9

What is the ratio of maximum fluctuation of speed to
the mean speed?
A. Fluctuation of speed
B. Maximum fluctuation of speed
C. Coefficient of fluctuation of speed
D. None of the above

Answer 9

C

Question 10

What is the reciprocal of the coefficient of fluctuation of
speed?
A. Fluctuation of speed
B. Coefficient of steadiness
C. Maximum fluctuation of speed
D. None of the above

Answer 10

B

Question 11

Flywheel arms are usually of ________ cross-section.
A. Circular C. Rectangular
B. Elliptical D. Squared

Answer 11

B

Question 12

A solid flywheel is rotating about its own axis, the direction
of its angular momentum is:
A. Along the axis of rotation
B. Along the tangent to direction of both position vector
and velocity vector
C. Perpendicular to the direction of angular velocity
D. Radial

Answer 12

B

Question 13

Cast-iron wheels having solid rims burst at this rim speed
(ft/sec) corresponding to a centrifugal tension of about
15,600 psi.
A. 230 C. 325
B. 275 D. 395

Answer 13

D

Question 14

In flywheel design, if W equals the width of the arm at the
hub (length of major axis) and D equals the shaft diameter,
then W equals 1.3D for a wheel having 6 arms; and for an
8-arm wheel W equals ______.
A. 1.2D C. 1.4D
B. 1.3D D. 1.5D
SOLUTION:
This is from MHB, 26th Ed, p. 184.

Answer 14

A

Question 15

In automobiles, flywheel is placed in between ____.
A. Engine and clutch
B. Clutch and propeller shaft
C. Propeller shaft and differential Gear
D. None of the above

Answer 15

A

Question 16

Which of the following stresses acts on the spokes of the
flywheelvi?
A. Direct shear stress C. Torsional shear stress
B. Tensile stress D. Compressive stress

Answer 16

B

Question 17

The amount of energy absorbed by a flywheel2
is
determined from the __________.
A. torque-crank angle diagram
B. acceleration-crank angle diagram
C. speed-space diagram
D. speed-energy diagram

Answer 17

A

Question 18

What is the form of energy stored in a flywheel?
A. Heat energy C. Solar energy
B. Kinetic energy D. Potential energy

Answer 18

B

Question 19

Which of the following where the Flywheel is used?
A. Punch press C. Drilling machine
B. Surface grinder D. Milling machine

Answer 19

A

Question 20

What is/are the material/s composition of flywheels?
A. Cast Iron C. High strength steel
B. Ceramics D. All of the above

Answer 20

D

Question 21

When the torque required by the machine is more than
the torque supplied by tche motor; the flywheel is:
A. accelerated C. retarded
B. at constant speed d. NONE of the above

Answer 21

C

Question 22

The cross-section of the flywheel arm is _________.
A. I section C. rectangular
B. elliptical D. circular

Answer 22

B

Question 23

Which of the following stresses acts on the spokes of the
flywheel?
A. Direct shear stress C. Torsional shear stress
B. Tensile stress D. Compressive stress

Answer 23

B