MCQ on Flywheeel and fluctuation of energy

 MCQ on Flywheeel and fluctuation of energy 

1. In the case of a flywheel, the maximum fluctuation of energy is the

(a)      Sum of maximum and minimum energies

(b)     Difference between the maximum and minimum energies

(c)      Ratio of the maximum and minimum energy

(d)     Ratio of the minimum and maximum energy

 

2.   In a 4-stroke IC engine, the turning moment during the compression stroke is

(a)      positive throughout

            (b)      negative throughout

            (c)      positive during major portion of the stroke

            (d)     negative during major portion of the strok

      3.  Identify the incorrect statement

      (a)     Turning moment diagram is a graphical representation of turning moment of crank effort for various position of the crank

     (b)     The area of turning moment diagram represents the workdone

(c      (C). The variation of energy above and below the mean resisting torque line is called fluctuation of energy

(d    (4).  The coefficient of fluctuation of energy is defined as the ratio of work done per cycle to the maximum fluctuation of energy

           4.    Identify the wrong statement with regard to flywheels 

       (a)     The coefficient of fluctuation of speed remains same with any change in the mean speed of the prime mover'

      (b)     The maximum fluctuation of energy of a flywheel is directly proportional to coefficient of fluctuation of speed.

         (c)     For the same fluctuation of energy, the size of the flywheel is reduced at higher mean speed of rotatio

      (d)     For the same mass of flywheel, the rim type and disc flywheel are equally preferable

5. Why is the mass of flywheel concentrated in the rim?

(a)     to store minimum energy

(b)     to make it strong

(c)     to store maximum energy

(d)     to let it rotate freely

 

6. A rotating shaft carries a flywheel which overhangs on the bearing as a cantilever.

If this flywheel weight is reduced to half of its original weight, the whirling speed

will

(a)     Be double

(b)     Increase by 2. times

            (c)     Decrease by 2 times

             (d)     Be half

     7. The cycle time of a punching press is 5 seconds and the stroke is 100 mm. If the punching press is used to punch a sheet of 2 mm thickness then the exact punching time is equal to

(a) 0.05 second          (b) 0.1O second

(c) 10 second             (d) 0.25 second

 

1.

(b)

2.

(b)

3.

(d)

4.

(d)

5.

(c)

6.

(b) 7. (a)