Deck 10: Mechanical Engineering: Gears, Linkages

Question 1

The key generally used in wrist watches is

A)Saddle key
B)Sunk key
C)Wood ruff key
D)Tangent key
E)None of the above

Answer 1

A

Question 2

In case of involute the angular velocity ratio is

A)Directly proportional to radius of base circle from which the involute was generated
B)Inversely proportional to radius of base circle from which the involute was generated
C)Directly proportional to the distance of the chord over which thread is unwound
D)Inversely proportional to the distance of the chord over which thread is wound
E)None of the above

Answer 2

B

Question 3

Which one of the following is not a spring controlled governor?

A)Porter governor
B)Hartnell governor
C)Pickering governor
D)None of the above
E)None of the above

Answer 3

A

Question 4

The purpose of differential in locmomtive is served by

A)Shape of rails
B)Taper on wheels
C)Taper on rails
D)Track contour
E)Track curvature

Question 5

The normal at any point of a involute is

A)Also normal to that circle
B)Tangent to the circle
C)Is inclined to the normal to the circle at an angle equal to pressure angle
D)Is inclined to the tangent to the circle at an angle equal to the pressure angle
E)None of the above

Question 6

The number of links in Paucellier mechanism is

A)4
B)5
C)6
D)8
E)None of the above

Question 7

A point on a link connecting double slider crank chain will trace a (an)

A)Straight line
B)Parabola
C)Ellipse
D)Hyperbola
E)Circle

Question 8

The differential gear in the automobiles is used to

A)Provide balancing
B)Assist in changing speed
C)Help in turning
D)Provide jerk free movement of vehicle
E)Reduce speed

Question 9

The abbreviation P.I.V. drive system stands for

A)Purely Integral Variance
B)Positive Infinitely Variable
C)Periodic Ideal Vibrationless
D)Polar Inertia Vee belt
E)Perfectly Induced Velocities

Question 10

The Biflar susperision method is used to determine

A)Position of balancing weights
B)Centripetal acceleration
C)Natural frequency of vibration
D)Moment of inertia
E)None of the above

Question 11

A Scott-Russel mechanism consists of

A)Turning and rotary pairs
B)Turning pair only
C)Sliding and turning pairs
D)Sliding and rotary pairs
E)Rotary pair only

Question 12

If three bodies have plane motions, their instantataneous centres

A)Lie in different planes
B)Lie in a plane perpendicular to the plane of motion
C)Lie in the same plane as the plane of motion
D)Lie on a straight line
E)None of the above

Question 13

The prime circle of a cam is

A)The smallest circle drawn to the pitch curve from the centre of rotation of curve
B)The smallest circle drawn to the cam profile from the centre of rotation of a radial cam
C)The circle with centre as the centre of cam axis and radius such that it passes through the pitch point
D)The circle fitting in cam profile
E)None of the above

Question 14

A pulley in a belt drive acts as a

A)Rolling pair
B)Turning pair
C)Surface pair
D)Sliding pair
E)Cylindrical pair

Question 15

In the gear box of an automobile, which gear train is used?

A)Simple gear train
B)Compound gear train
C)Epicyclic gear train
D)None of the above
E)None of the above

Question 16

The locus of a point one the circumference of a circle which rolls without slipping on a fixed straight line, is known as

A)Involute
B)Epicycloid
C)Cycloid
D)Hypocycloid
E)None of the above

Question 17

Stub tooth is

A)Shorter than standard tooth depth
B)Standard gear tooth
C)Equivalent rack tooth
D)Non-standard tooth
E)Longer than standard tooth depth

Question 18

Which of the following road offers maximum resistance to automobiles?

A)Wood paving
B)Macadam
C)Well rolled ground
D)Loose sand
E)None of the above

Question 19

In case of worm and worm wheel, the maximum efficiency is obtained when

A)Worm is driver
B)Worm wheel is driver
C)Either of the worm or worm wheel is a driver
D)Depends on other factors
E)None of the above

Question 20

In a balancing machine, the units for unbalance measurement are

A)gm-cm-cps
B)cps
C)cm
D)gram
E)gm-cm

Question 21

The type of teeth used on a gear used in sugar crushing is

A)Hyperboild
B)Semi-epicycloidal
C)Involute
D)Cycloidal
E)Epicycloidal

Question 22

In a pin jointed mechanism, the line of thrust on a link is

A)tangential to the friction circles at the ends
B)along the friction axis
C)inclined to axis of link by an angle ?, known as angle of friction
D)All the above
E)None of the above

Question 23

In automobiles, Hooke's joint is used between

A)Flywheel and clutch
B)Clutch and gear box
C)Gear box and differential
D)Differential and wheels
E)None of the above

Question 24

A pair is termed as a higher pair when relative motion between two elements of the pair is

A)partly sliding and partly turning
B)rolling only
C)Outer circle
D)sliding only
E)turning only

Question 25

The swaying couple in a locomotive is due to

A)unbalanced primary forces
B)unbalanced secondary forces
C)partial balancing
D)None of the above
E)None of the above

Question 26

Bearing suitable for fluctuating loads is

A)Ball bearing
B)Needle roller bearing
C)Sleeve bearing
D)Bush bearing
E)Roller bearing

Question 27

Radial distance from the top to the pitch circle for a tooth is known as

A)working depth
B)dedendum
C)addendum
D)None of the above
E)None of the above

Question 28

Higher pressure angle results in

A)Narrow base and weaker teeth
B)Weaker teeth
C)Non-uniform motion transmission
D)Bigger size of gear teeth
E)Wider base and stronger teeth

Question 29

In a radial cam with a roller on follwer the prime circle can be defined as

A)the smallest circle tangent to the pitch curve
B)the smallest circle tangent to the cam profile
C)a circle drawn with radius equal to the distance between the pitch point and the centre of base circle
D)None of the above
E)None of the above

Question 30

Identify the incorrect statement in case of cycloidal gears

A)No lubrication needed
B)Interference does not exist
C)Have less wear
D)Interference exists
E)Ease in transmitting variable loads

Question 31

Which one of the following is not applicable to involute profile

A)The angular velocity ratio when tow involutes are in mesh, is inversely proportional to the size of the base circles
B)No involute has a pressure angle until it is brought in contact with other mating involute
C)Involute is the only tooth form that is not sensitive to centre distance of their base circles
D)The shape of the involute profile is dependent only on the dimensions of the base circle
E)The pitch diameters of mating involutes are inversely proportional to their base circle diameters