Deck 6: Mechanisms and Kinematics: Gears, Belts, and Linkages

Question 1

Which one of the following is the inversion of slider crank mechanism

A)Reciprocating internal combustion engine
B)Crank and slotted level mechanism
C)Whitworth quick return mechanism
D)(A) and (B) above
E)(A), (B) and (C) above

Answer 1

(A), (B) and (C) above

Question 2

The radial depth of a ger tooth below the pitch circle is

A)Addendum + dedendum
B)Addendum
C)Addendum-clearance
D)Dedendum-clearance
E)Dedendum

Answer 2

Dedendum

Question 3

The pitch point on a cam is

A) Any point on pitch curve
B) The point on cam pitch circle having the maximum pressure angle
C) Any point on pitch curve.
D) A point at a distance equal to pitch circle radius from the centre
E) None of the above

Answer 3

The point on cam pitch circle having the maximum pressure angle

Question 4

While evaluating the minimum number of teeth on a opinion the major consideration is

A)Operating speed
B)To minimise clearance
C)To avoid interference
D)The shaft diameter on which pinion is to be mounted
E)The minimum diameter of the pinion

Question 5

Gears of watches are generally manufactured by

A)Stamping
B)Machining on a gear shaper
C)Power metallurgy process
D)Die casting
E)Machining on a hobber

Question 6

The effect of creep in case of cross belt drive is

A)to increase power transmission
B)to increase the speed of driven pulley
C)to reduce the speed of driven pulley
D)None of the above
E)None of the above.

Question 7

Isochronism in a governor is desirable when

A)One speed is desired under one load
B)The engine operates at high speeds
C)The engine operates at variable speeds
D)One speed is desired to be kept for all loads
E)The engine operatres at low speeds

Question 8

In case of locomotives, the swaying couple is resisted by

A)Dead weight of the engine
B)Fish plates of the tails
C)Inside section of the rails
D)Side pressure between the flanges of the wheels
E)(C) and (D) together

Question 9

A gear cutter suitable for cutting 42 to 54 teeth will provide correct form

A)For any gear having teeth anywhere between 42 to 54
B)For only 42 teeth gear
C)For only 54 teeth gear
D)For only 48 teeth gear
E)None of the above

Question 10

Sensitiveness of a governor is

A)The range of variation of engine speed
B)The ratio of the maximum speed to minimum speed within the operating range
C)The ratio of the difference between the maximum and mean speed to that of minimum to mean speed
D)The ratio of the difference between the maximum and minimum equilibrium speed to the mean equilibrium speed
E)None of the above

Question 11

A kinematic chain becomes a mechanism when

A)Any one link is fixed
B)There is no such criterion
C)None of the links are fixed
D)All link are fixed
E)First link is fixed

Question 12

Module for gear is expressed in terms of

A)Number of teeth per unit diameter (mm)
B)Diameter (MM) per number of teeth
C)Millimeters
D)(mm)-1
E)None of the above

Question 13

Which is incorrect statement, if any

A)The force of friction is independent of the velocity of sliding
B)The force of friction is independent of the extent of the surfaces in contact
C)The force of friction is directly proportional to the pressure between the surfaces in contact
D)The laws of friction are true when the intensity of the pressure between the surfaces is small
E)None of the above

Question 14

In the cam mechanism, a mushroom follower is

A)One with cylindrical roller held by a pin to the follower assembly
B)One provided with a flat face with a perfect flat plane
C)One identical to a knife edge follower with spherical end
D)One which moves irregularly with uniform movement of cam
E)One which moves in zig-zag path

Question 15

In a slider-crank mechanism

A)there are 4 turning pairs
B)one is a turning pair and 3 sliding pairs
C)two turning pairs and two sliding pairs
D)None of the above
E)Slider-crank mechanism

Question 16

A nut and bolt form a

A)Helical pair
B)Sliding pair
C)Spherical pair
D)Turning pair
E)Rolling pair

Question 17

Crowning is done on

A)Shafts
B)Gears
C)Pulleys
D)Bearings
E)Keys

Question 18

In case of gears the tooth fillet is

A)Width of the gear tooth
B)Radius that connects the root circle to the profile of the tooth
C)Surface of the top of the tooth
D)Curve forming face and flank
E)Part of the tooth surface lying below the pitch surface

Question 19

The sense of tangential acceleration of a link

A)Is the same as that of velocity
B)Is opposite to the velocity
C)Could be either the same or opposite to velocity
D)Is always in a plane perpendicular to the plane of motion
E)None of the above

Question 20

A beater machine in a pulp mill is driven by a 50 H.P. motor using 6 vee belts of D section. If one of the belt breaks after a month

A)All the belts have to be replaced
B)Broken belt may be replaced by the similar etc
C)Broken belt and at least one adjacent belt should be replaced
D)Broken belt and at least two adjacent belt should be replaced
E)None of the above

Question 21

A pantograph is a mechanism or a kinematic arrangement comprising

A)A lower pair
B)Two lower pairs
C)Three lower pairs
D)10 links
E)None of the above

Question 22

Which one of the following is lightest?

A)Sperm
B)1 British ton
C)1 Metric tonne
D)1 US long ton
E)1 US short ton

Question 23

The angle of a V-belt is

A)60°
B)35°
C)45°
D)40°
E)30°

Question 24

A pantograph is a mechanism with

A)Rolling pairs
B)Higher pairs
C)Turning pairs
D)Lower pairs
E)Spherical pairs