21) The contact ratio gears is always
a) more than one
b) one
c) less than one
d) zero
22) Select the positive drive amongst the following:
a) rope drive
b) V-belt drive
c) chain drive
d) gear drive
23) The difference between space width and tooth thickness is
a) Backlash
b) Clearance
c) Flank
d) Tooth space
24) The gear train usually employed in clocks is a
a) reverted gear train
b) simple gear train
c) sun and planet gear
d) differential gear
25) A pair of action and reaction forces acting on a body are known as
a) applied forces
b) constraint forces
c) accelerating forces
d) inertia forces
26) In which one of the following is a flywheel generally employed
a) Lathe
b) Electric motor
c) Punching machine
d) Gear bor
27) Sensitivity of an isochronous governor is
a) zero
b) one
c) two
d) infinite
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