Deck 9: Mechanical Engineering Gears, Mechanisms, and Drives

Question 1

For two meshing gears, their

A)Clearance must be same
B)No. of teeth must be same
C)Dedendum must be same
D)Addendum must be same
E)Module must be same

Answer 1

Module must be same

Question 2

The curve traced by the end of a thread as it is unwound from a stationary cylinder is known as

A)Involute
B)Circle
C)Epicycloid
D)Cycloid
E)Straight line

Answer 2

Involute

Question 3

The Ackermann steering gear consists of a four bar mechanism with

A)Only one pair turning and three paris sliding
B)All four pairs sliding
C)Only two pairs turning and low pairs sliding
D)Only three pairs turning and one pair sliding
E)All four pairs turning

Answer 3

All four pairs turning

Question 4

In the case of an automobile power is transmitted from the gear box to the differential through

A) Bevel gears
B) Hooke's joint
C) Oldham's coupling
D) None of the above
E) None of the above.

Question 5

The linear velocity of a point on a link relative to any other point on the link will be

A)Along the line joining the two points
B)Perpendicular to the line joining the two points
C)Same as that of the end points of link
D)Perpendicular to the lower end of the link
E)None of the above

Question 6

A Peaucellier mechanism has

A)Ten links
B)Eight links
C)Four links
D)Twelve links
E)Six links

Question 7

Two parallel shafts, the distance between whose axies is small and variable, may be connected by

A)Knuckle joint
B)Clutch arrangement
C)Gear drive
D)Oldham's coupling
E)Universal joint

Question 8

Nominal top width of a B type V-belt is

A)13 mm
B)22 mm
C)32 mm
D)17 mm
E)31 mm

Question 9

The number of nodes in shaft carrying only tow rotor at the ends will be

A)An odd number
B)One
C)An even number
D)Zero
E)Two

Question 10

Which of the following gear is not used on non-parallel, non-intersecting shafts?

A)Bevel
B)Worm
C)Helical
D)Hypoid
E)All of the above

Question 11

In case of helical gears the angle between the plane containing the axes of the gear and plane passing through the pitch point is known as

A)Lead angle
B)Helix angle
C)Pitch angle
D)Pressure angle
E)Axial pitch angle

Question 12

In case of flat belt drive the length of belt in case of

A)Open belt depends on sum of the diameters of pulleys
B)Open belts depends on difference of the diameters of pulleys
C)Cross belts depends on the sum of the diameters of pulleys
D)Cross belts depends on the difference of the diameters of pulleys
E)None of the above

Question 13

The purpose of providing multiple collars on a flat collar pivot bearing is to

A)Increase frictional resistance
B)To establish self-sustaining bearing condition
C)Distribute the frictional load because of limiting friction
D)Distribute the axial load because of limiting bearing pressure on a collar
E)None of the above

Question 14

In an at tomobile the power is transmitted from gear box to differential through

A)Universal joint
B)Hooke's joint
C)Kunckle join
D)Oldham's coupling
E)Bevel grars

Question 15

Slip in belt drive is

A)Loss of power
B)Difference between the velocities of two pulleys
C)Difference between the angular velocities of two pulleys
D)Difference between the linear speed of the rim of pulley and the belt on it
E)None of the above

Question 16

Tangential acceleration direction is

A)Along the angular velocity
B)Perpendicular to the angular velocity
C)Opposite to the angular velocity
D)Any of (A) and (B)
E)Any of (A) and (C)

Question 17

Kinematics of machines deals with

A)Apparatus for applying mechanical power
B)Number of inter-related parts
C)The forces acting on the parts of the machine
D)The relative motion between the parts, neglecting the consideration of the force
E)None of the above

Question 18

A shaft revolving in a bearing forms a

A)Turning pair
B)Lower pair
C)Turning pair.
D)Higher pair
E)Clindrical pair

Question 19

In case of locomotives the percentage of primary forces balanced is generally

A)33 to 40 percent
B)40 to 50 percent
C)50 to 60 percent
D)60 to 70 percent
E)None of the above

Question 20

The belt drive can transmit maximum power when maximum total tension in belt equals

A)Centrifugal tension
B)Twise the centrifugal tension
C)Thrice the centrifugal tension
D)Four times the centrifugal tension
E)None of the above

Question 21

The function of a governor is

A)To control the engine speed
B)To maintain the speed of engine constant
C)To maintain constant piston speed of engine
D)To maintain the speed of an engine within prescribed limits of varying load conditions
E)None of the above

Question 22

In case of spur gears the top land is

A)The part of the tooth surface lying below the pitch surface
B)The curve forming face and flank
C)Radius that connects the root circle to the profile of the tooth
D)The width of the gear tooth measured axially along the pitch surface
E)The surface of the top of the tooth

Question 23

The no of links in Hart mechanism is

A)8
B)6
C)5
D)4
E)All of the above

Question 24

In a slider crank mechanism for l/r ratio of 4 the percentage of stroke converted by piston corresponding to 90? movement of crank from top centre will be

A)0 percent
B)Less than 50%
C)More than 50%
D)100%
E)None of the above