# Theory of Machines mcq with answers | TOM 2

## Theory of Machines 2 mcq questions and answers

Top 60 theory of machines mcq with answers is given below. These TOM mcqs are asked in some of the previous online exams of SPPU pune university, MU, Anna university and others too. We mention answers for each Theory of machines multiple choice question below four options. This post mainly focuses on Theory of machine 2 mcq question.

Q.no 1. At precision positions in function generation problem
A : generated function always agree with the desired function
B : generated function never agree with the desired function
C : generated function may agree with the desired function
D : Precision position does not relate the generated function and desired function

generated function always agree with the desired function

Q.no 2. Herring-bone gears are also known as
A : Double spur Gears
B : Double helical gear
C : Double spiral gears
D : Hypoid gears

Double helical gear

Q.no 3. Which of the following variator is also known as Wulfel-Kopp tourator?
A : Cone variator with spheres
B : Spheroid variator
C : PIV Drive
D : Face plate variator

Cone variator with spheres

Q.no 4. Throw of a cam is the maximum distance of the follower from
A : Base circle
B : Pitch circle
C : Root circle
D : Prime circle

Base circle

Q.no 5. Pitch point of a cam is
A : A point on the pitch curve having minimum pressure angle
B : A point on the pitch curve having maximum pressure angle
C : any point on the pitch curve
D : any point on the pitch circle

A point on the pitch curve having maximum pressure angle

Q.no 6. Which of the following mathematical tool is used to synthesize the mechanism
graphically?

A : Tangent
B : Perpendicular bisector
C : Chord
D : Arc of contact

Perpendicular bisector

Q.no 7. How is the direction of precession vector decided by right hand rule?
A : Thumb denotes direction of precession vector
B : Curled fingers denote direction of precession vector
C : Thumb denotes direction of Spin vector
D : both 1 & 2

Thumb denotes direction of precession vector

Q.no 8. Which type of gears has point contact between two mating gears?
A : Helical gears
B : Spur gears
C : Bevel gears
D : Spiral gears

Spiral gears

Q.no 9. Two non-intersecting non-parallel shafts are connected by
A : Bevel gears
B : Spiral gears
C : Worm and worm gear
D : Helical gears

Spiral gears

Q.no 10. What is meant by interference?
A : Mating of conjugate profiles of a tooth
B : Mating of involute profiles of a tooth
C : Mating of non-involute profiles of a tooth
D : Mating of cycloidal profiles of a tooth

Mating of non-involute profiles of a tooth

## Theory of Machines 2 mcq

Q.no 11. Which type of regulation speeds are achieved by electrical,hydraulic and mechanical
methods?

A : Stepped Regulation
B : Stepless Regulation
C : PIV Drive
D : Both Stepped and Stepless regulation

Stepless Regulation

Q.no 12. Which type of gear train supports only one gear on each shaft
A : Reverted
B : Epicyclic
C : Compound
D : Simple

Simple

Q.no 13. The gear used to convert rotary motion into translating motion is
A : Crown gear
B : Rack and pinion
C : Worm and wheel
D : Spiral Bevel gear

Rack and pinion

Q.no 14. Which of the following can be used for power transmission in intersecting shafts
A : Spur Gear
B : Helical Gear
C : Herringbone Gear
D : Bevel Gear

Bevel Gear

Q.no 15. Order defect can be defined as
A : Improper configuration of precision points
B : Non covering of all points by the mechanism
C : Too many configuration points
D : Too many coordinate systems

Improper configuration of precision points

Q.no 16. In a radial cam the follower moves
A : In a direction perpendicular to the cam axis
B : In a direction parallel to the cam axis
C : In any direction irrespective of the cam axis
D : Along the cam axis

In a direction perpendicular to the cam axis

Q.no 17. The virtual number of teeth for helical gear is
A :
B :
C :
D :

C

Q.no 18. While drawing displacement diagram outstroke or angle of ascent should be divided
into

A : Even number of equal parts
B : Even parts only
C : Equal parts only
D : Any number

Even number of equal parts

Q.no 19. Teeth of a bevel gear are actually laid on the surface of a
A : cone
B : pyramid
C : plane
D : sphere

cone

Q.no 20. Which formula is used to calculate maximum efficiency of worm gear?
A :
B :
C :
D :

B

Q.no 21. When follower moves with uniform velocity slope of displacement curve must be
A : Varies
B : Constant
C : Low
D : High

Constant

Q.no 22. When rotor rotates in clockwise direction and ship steers to right ,the effect of
reactive gyroscoic couple is to

A : Raise the bow and dip the stern
B : Raise the stern and dip the fore end
C : No effect
D : Raise the stern and dip the bow

Raise the bow and dip the stern

Q.no 23. Angle of action of cam is defined as the angle
A : of rotation of the cam for a definite displacement of the follower
B : Through which the cam rotates during the period in which the follower remains in the highest
position
C : Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
D : Moved by the cam from beginning of ascent to the termination of descent

Moved by the cam from beginning of ascent to the termination of descent

Q.no 24. The variator was developed in Russia known as
A : Cone variator
B : PIV
C : Svetozarov variator
D : CVT

Svetozarov variator

Q.no 25. For errors in function generation, which of the following statement is true?
A : Structural errors are 0 at precision points
B : Structural and mechanical errors are coexistent
C : Increase in precision points will increase structural error
D : Decrease in precision points will decrease structural error

Structural errors are 0 at precision points

Q.no 26. In an automobile, if the vehicle makes a left turn, the gyroscopic torque
A : increases the forces on the outer wheels
B : decreases the forces on the outer whee
C : does not affect the forces on the outer wheels
D : none of the above

increases the forces on the outer wheels

Q.no 27. Motion of a pick and place robotic arm is a synthesis probem of
A : Path generation problem
B : function generation problem
C : body guidance problem
D : Path generation and function generation both

Path generation problem

Q.no 28. Which of the following displacement diagrams should be chosen for better dynamic
performance of a cam-follower mechanism ?

A : Simple harmonic motion
B : Parabolic motion
C : Cycloidal motion
D : Uniform motion

Cycloidal motion

Q.no 29. In which cam ,follower reciprocates or oscillates parallel to axis of cam rotation
A : Tangent cam
B : Cylindrical cam
C : Disc cam
D : Wedge cam

Cylindrical cam

Q.no 30. The rotor of a ship rotates in clockwise direction when viewed from stern and the
ship takes a left turn. The effect of gyroscopic couple acting on it will be

A : to raise the bow and stern
B : to lower the bow and stern
C : to raise the bow and lower the stern
D : to raise the stern and lower the bow

to raise the bow and lower the stern

Q.no 31. Which equation is known as Freudenstein’s equation?
A :
B :
C :
D :

D

Q.no 32. Interference in gear tooth profiles can be avoided by
A : Modifying tooth profile
B : Modifying center distance between pinion and wheel
C : Both
D : None of the above

Both

Q.no 33. A three start worm rotating at 1000 r.p.m. drives a 31 teeth worm gear. Pitch of teeth
is 20 mm on a 60 mm pitch diameter of worm. The lead angle of worm would be

A : 18.56Ëš
B : 71.43Ëš
C : 17.65Ëš
D : 72.34Ëš

17.65Ëš

Q.no 34. The contact ratio for gears is
A : Zero
B : Less than one
C : Greater than one
D : None of the mentioned

Greater than one

Q.no 35. When flat face follower is circular then it is called as
A : Roller follower
B : Mushroom follower
C : Spherical follower
D : Knife edge follower

Mushroom follower

Q.no 36. For a lead angle 17.65Ëš and frictional angle 2Ëš, the efficiency of worm gear drive is
A : 0.8169
B : 0.8911
C : 0.9325
D : 0.9048

0.8911

Q.no 37. Involute profile is preferred to cyloidal because
A : The profile is easy to cut
B : Only one curve is required to cut
C : The rack has straight line profile and hence can be cut accurately
D : None of the above

Only one curve is required to cut

Q.no 38. The maximum length of arc of contact for two mating gears, in order to avoid
interference, is where r = Pitch circle radius of pinion,
R = Pitch circle radius of driver, and
Ï† = Pressure angle

A : (r + R) sin Ï†
B : (r + R) cos Ï†
C : (r + R) tan Ï†
D : 2 (r + R) tan Ï†

(r + R) tan Ï†

Q.no 39. The velocity diagram with simple harmonic motion will be a
A : Parabola
B : Hyperbola
C : Sine curve
D : Cosine curve.

Sine curve

Q.no 40. When ship is pitching and Bow is falling, the effect of reactive gyroscopic couple is to
move the ship

A : towards starboard side
B : towards port side
C : towards bow end
D : towards stern

towards starboard side

## Theory of Machines mcq with answers

Q.no 41. Determine axial force acting on bevel gears when tangential force of 2700 N acts on
it. Pitch cone angle=12.36Ëšand pressure angle=30Ëš.

A : 295.82 N
B : 333.67 N
C : 512.39 N
D : 1522.71 N

333.67 N

Q.no 42. What is the use of tangent cams
A : To operate inlet and exhaust valves of I C engines.
B : To operate the inlet valve of I C engines
C : To operate the exhaust valve of I C engines
D : To operate the crankshaft of an IC engine

To operate inlet and exhaust valves of I C engines.

Q.no 43. Speed reduction in a gear box is achieved using a worm and worm wheel. The worm
wheel has 30 teeth and a pitch diameter of 210 mm. If the pressure angle of the worm is 20o,
what is the axial pitch of the worm?

A : 7 mm
B : 22 mm
C : 14 mm
D : 63 mm

22 mm

Q.no 44. A three start worm rotating at 1000 r.p.m. drives a 31 teeth worm gear. Pitch of teeth
is 20 mm on a 60 mm pitch diameter of worm. The centre distance would be

A : 257.35 mm
B : 197.35 mm
C : 128.67 mm
D : 64.34 mm

128.67 mm

Q.no 45. Find out Three precision points in the interval of 40 deg to 120 deg by using
graphical method of CHEBYSHEB s

A : 45 deg, 80 deg, 115 deg
B : 50 deg, 85 deg, 120 deg
C : 55 deg, 905 deg, 110 deg
D : 60 deg, 95 deg, 125 deg

45 deg, 80 deg, 115 deg

Q.no 46. The train value of a gear train is
A : equal to velocity ratio of a gear train
B : reciprocal of velocity ratio of a gear train
C : always greater than unity
D : always less than unity

reciprocal of velocity ratio of a gear train

Q.no 47. When the ship is pitching down , the effect of gyroscopic couple is
A : Move towards starboard side
B : No effect
C : Move towards Port side
D : Stern will get lifted

Move towards Port side

Q.no 48. A pair of gears, having 40 and 20 teeth respectively, are rotating in mesh, the speed
of the smaller being 2000 r.p.m. find the angular velocity of the larger gear

Q.no 49. In a ship when looking from stern side if propeller rotates in clockwise direction and
if it is taking right turn then the effect will be

A : Nose will be lifted
B : Bow will be lifted
C : Stern will get lifted
D : No effect

Stern will get lifted

Q.no 50. The product of the diametral pitch and circular pitch is equal to
A : 1
B : 1/Ï€
C : Ï€
D : Ï€ Ã— No. of teeth

Ï€

Q.no 51. In a gear train input Gear A is in mesh with gear B. Gear B is compounded with
gear C which is in mesh with output Gear D.If speed of gear A is 100 rpm. Number of teeth on gear A and gear B are 60 and 30 while that on gear C and D are 20 and 40 respectively.
Find the speed of gear D

A : 200 rpm
B : 100 rpm
C : 300 rpm
D : 50 rpm

100 rpm

Q.no 52. The number of teeth on each of the two equal spur gears in mesh are 40. The teeth
have 20 deg. involute profile and the module is 6 mm. The length of arc of contact is 33mm ,
find the length of path of contact and pitch circle radii of each wheel.

A : 31mm, 120mm, 120mm
B : 31mm, 110mm, 220mm
C : 33mm, 120mm, 120mm
D : 33mm, 110mm, 220mm

31mm, 120mm, 120mm

Q.no 53. When the axes of the first and the last wheels are co-axial, then the train is known as
A : simple train of wheels
B : compound train of wheels
C : reverted gear train
D : epicyclic gear train

reverted gear train

Q.no 54. What is the gyroscopic couple acting on the disc which has mass moment of inertia
equal to 0.02135 kg-m2. If disc has a speed of 500 rpm and is made to precess at 100 rpm.

A : 13.21 N-m
B : 11.70 N-m
C : 10.23 N-m
D : 12.70 N-m

11.70 N-m

Q.no 55. The gears are termed as medium velocity gears, if their peripheral velocity is
A : 1â€“3 m / s
B : 3â€“15 m / s
C : 15â€“30 m / s
D : 30â€“50 m / s

3â€“15 m / s

Q.no 56. If the crank rotation angle varies from 45 degrees to 135 degrees, Using three
precision points with chebyshevâ€™s spacing, synthesize a slider crank mechanism where where
displacement of slider is square of the crank rotation. From the above information calculate
â€˜aâ€™ in mm.

A : 48.2
B : 58.2
C : 45.6
D : 42.2

48.2

Q.no 57. The helix angle for single helical gears ranges from
A : 10Â° to 15Â°
B : 15Â° to 20Â°
C : 20Â° to 35Â°
D : 35Â° to 50Â°

20Â° to 35Â°

Q.no 58. For high speed engines the cam follower should move with
A : Uniform velocity
B : Simple harmonic motion
C : Uniform acceleration and retardation
D : Cycloidal motion

Cycloidal motion

Q.no 59. Which of the following conditions can be used to minimize undercutting in cam and
follower mechanism?

A : By using larger roller diameter
B : By using internal cams
C : By decreasing the size of the cam
D : By increasing the size of the cam

By using internal cams

Q.no 60. Calculate number of teeth on wheel to avoid interference, if wheel has addendum
coefficient of one, pressure angle being 22 deg. and gear ratio of 2.

A : 10
B : 34
C : 24
D : 20