Theory of Machines MCQs
Theory of Machines MCQs
The following Theory of Machines MCQs have been compiled by our experts through research, in order to test your knowledge of the subject of Theory of Machines. We encourage you to answer these multiple-choice questions to assess your proficiency.
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1: The dynamic friction is the friction experienced by a body, when the body
A. Is in motion
B. Just begins to slide over the surface of the other body
C. None of these
D. Is at rest
2: The acceleration of the particle moving with simple harmonic motion is inversely proportional to the displacement of the particle from the mean position.
A. No
B. Yes
3: A pair of friction discs is an example of rolling pair.
A. False
B. True
4: A disturbing mass m1 attached to the rotating shaft may be balanced by a single mass m2 attached in the same plane of rotation as that of m1, such that (where r1 and r2 are the radii of rotation of m1 and m2 respectively)
A. M1m2 = r1r2
B. M1r1 = m2r2
C. None of these
D. M1r2 = m2r1
5: When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be
A. Stable
B. Isochronous
C. Unstable
D. None of these
6: In order to balance the reciprocating masses,
A. Secondary forces and couples must be balanced
B. Both primary forces and couples must be balanced and secondary forces and couples must be balanced
C. None of these
D. Primary forces and couples must be balanced
7: An automobile steering gear is an example of
A. Rolling pair
B. Lower pair
C. Sliding pair
D. Higher pair
8: The gears are termed as medium velocity gears, if their peripheral velocity is
A. 1 - 3 m/s
B. 15 - 30 m/s
C. 30 - 50 m/s
D. 3 - 15 m/s
9: In order to give the primary balance of the reciprocating parts of a multi-cylinder in-line engines,
A. Both the algebraic sum of the primary forces must be equal to zero and the algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
B. None of these
C. The algebraic sum of the primary forces must be equal to zero
D. The algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
10: The factor which affects the critical speed of a shaft is
A. All of these
B. Diameter of disc
C. Span of shaft
D. Eccentricity
11: In a coupling rod of a locomotive, each of the four pairs is a __________ pair.
A. Sliding
B. Rolling
C. Turning
D. Screw
12: Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair.
A. Right
B. Wrong
13: When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a
A. Force-closed pair
B. Lower pair
C. Self-closed pair
D. Higher pair
14: The static friction
A. Is independent of the area of contact, between the two surfaces
B. All of these
C. Always acts in a direction, opposite to that in which the body tends to move
D. Bears a constant ratio to the normal reaction between the two surfaces
15: Which of the following is a turning pair?
A. Piston and cylinder of a reciprocating steam engine
B. Ball and a socket joint
C. Lead screw of a lathe with nut
D. Shaft with collars at both ends fitted into a circular hole
16: The pair is known as a higher pair, when the relative motion between the elements of a pair is
A. Partly turning and partly sliding
B. Sliding only
C. Turning only
D. Rolling only
17: The maximum fluctuation of energy is the
A. Ratio of the mean resisting torque to the workdone per cycle
B. Difference between the maximum and minimum energies
C. Variations of energy above and below the mean resisting torque line
D. Sum of the maximum and minimum energies
18: The cam follower generally used in automobile engines is
A. Spherical faced follower
B. Fiat faced follower
C. Knife edge follower
D. Roller follower
19: The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)
A. (1 - c)m.ω2.r(cos θ - sin θ)
B. C.m.ω2.r sin θ
C. M.ω2.r cos θ
D. M.ω2.r(cos θ - sin θ)
20: In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to
A. 0.4
B. 0.8
C. 0.6
D. 0.2
21: The advantages of involute profile over cycloidal are given below. Identify if there is any incorrect statement
A. In the involute system, the pressure angle is constant, from commencement to end of engagement
B. The variation in the centre distance with in limits does not affect the two mating gears in the involute system
C. The straight teeth of the basic rank for the involute profile admits of simple tools
D. The interference is inherently absent in this system
22: A reverted gear train is one is which
A. The direction of rotation of first and last gear is the same
B. The direction of rotation of first and the last gear is opposite
C. The first and last gear are on the same shaft
D. The first and last gear are essentially on separate but parallel shafts
23: Slip in turning belt is
A. Always restricted to 1 percent
B. Less than 5%
C. Zero
D. Depends on the belt material
24: The effect of creep in case of cross-belt drive is
A. To increase the power transmitted
B. To increase the speed of driven pulley
C. (A) and (B) above together
D. To reduce the speed of the driven pulley and consequently reduce the power output
25: A cylindrical type cam is one
A. With circular type motion of follower
B. With cylindrical shape of follower
C. With disc type cam in which the position of the follower is determined by the radial distance from the cam axis.
D. With circumferential contour cut in the surface of the cylinder which rotates about its axis
26: A pulley in a belt-drive acts as a
A. Sliding pair
B. Cylindrical pair
C. Wrapping pair
D. Rolling pair
27: In case of cross-helical worm the axes of two shafts are
A. Non-intersecting
B. Parallel
C. Non-parallel-non intersecting
D. Intersecting
28: Ackermann steering gear consists of
A. Turning pair
B. Rolling and sliding pairs
C. Sliding pairs
D. Rolling pairs
29: Identify the incorrect statement if any
A. In case of free vibrations the external force is applied at the ends only
B. Damping is resistance to the oscillation
C. When the frequency of the external exciting force coincides with the natural frequency of the system, state of resonance is reached
D. Forced vibrations are independent of natural frequency of vibration
30: V-belts with E type cross-section are generally used in
A. Automobiles
B. Small engines
C. When driver and driven units are far off
D. Heavy duty machines
31: In a cam and follower mechanism, for the uniform velocity of the followers the displacement curve will have
A. No slope
B. Constant slope
C. Slope in positive direction only
D. Slope in both positive and negative direction
32: Pitch of gears is expressed by
A. Circular pitch
B. Diametral pitch
C. Module
D. Any of the above
33: Coriolis component is encountered in
A. Slider crank mechanism
B. Four bar chain mechanism
C. Quick return mechanism
D. (A) and (B) above
34: The mass moment of inertia is
A. The resistance to angular acceleration
B. The mass of every element of a body multiplied by its distance from the axis
C. Any of the above
D. None of the above
35: The number of forks provided in a Hooke's joint is
A. Three
B. Six
C. Two
D. One
36: Which of the following gears is free from axial thrust
A. Worm gears
B. Bevel gears
C. Herringbone gears
D. Helical gears
37: In case of hypoid gears the mutual position of shafts will be
A. Non-intersecting
B. Parallel
C. Non-parallel
D. Non-parallel, non-intersecting
38: Coriorli's component of acceleration exists whenever a point moves along a path that has
A. Gravitational acceleration
B. Rotational motion
C. Linear displacement
D. Tangential acceleration
39: The spring constant k of a coil-spring is
A. Inversely proportional to the square of the number of coils in the spring
B. Sperm
C. Directly proportional to the number of coils in the spring
D. Inversely proportional to the number of coils in the spring
E. E. directly proportional to the square of the number of coils in the spring
40: In case of spur gears the profile is
A. Radius that connects the root circle to the profile of the tooth
B. The curve forming face and flank
C. The part of the tooth surface lying below the pitch surface
D. The surface of the top of tooth
41: Dynamic of machines deals with
A. The relative motion between the parts, neglecting the consideration of forces
B. The forces acting on the parts of the machine
C. The apparatus for applying mechanical power
D. The number of interrelated parts, each having a definite motion
42: Klein's construction can be used when
A. Crank has a uniform angular velocity
B. Crank has a uniform angular acceleration
C. Crank has a non-uniform angular velocity
D. (A) and (B) above
E. E. (A) and (C) above
43: In the elliptical trammel mechanism, the midpoint of the link connecting the two sliders traverses
A. An elliptical path
B. A parabolic path
C. A circular path
D. None of the above
44: A dadial follower is
A. One that reciprocates in the guides
B. One that oscillates
C. One in which the follower translates along an axis passing through the cam centre of rotation
D. One in which the axis of the following movement is displaced from the cam centre
45: The pulley in a belt drive acts as
A. Sliding pair
B. Cylindrical pair
C. Turning pair
D. Rolling pair
46: A shaft having one end fixed has a disc oscillating freely at the other enIf the shaft stiffness, increases the natural frequency of vibrations will
A. Increase
B. Decrease
C. There will be no effect
D. Will depend on the stiffness of the disc
47: If a machine uses four V belts, while purchasing care should be taken to ensure that
A. All belts are same section
B. All above
C. All belts are of same batch number
D. All belts are of same size
48: In case of balancing problems pertaining to locomotives, the resultant unbalanced force is minimum when
A. Half of the reciprocating masses are balanced by rotating masses
B. 1/2 of the reciprocating mass are balanced by equivalent rotating mass
C. More than half of the reciprocating masses are balanced by rotating masses
D. Reciprocating masses are balanced half by equivalent opposite reciprocating masses and the balance by rotating masses
49: Which of the following is a higher pair?
A. A shaft revolving in a bearing
B. Piston reciprocating inside the cylinder
C. Ball and socket
D. E. None of the above
50: The vibrations in which the restoring forces are not proportional to the displacements and the first power of velocity are known as
A. Bearing vibrations
B. Over damped vibrations
C. Torsional vibrations
D. Nonlinear vibrations
List of Theory of Machines MCQ...
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Theory of Machines MCQs
Вопросы по теории машин на русском языке
Preguntas de Teoría de Máquinas en español
日本語での機械理論の質問
Domande di Teoria delle Macchine in lingua italiana
Questions de Théorie des Machines en langues françaises
Questões de Teoria das Máquinas em Língua Portuguesa
Fragen zur Maschinentheorie in deutschen Sprachen
机器理论中文题
أسئلة نظرية الآلات في اللغات العربية
Soal-soal Teori Mesin dalam bahasa Indonesia
Türk dillerinde Makine Teorisi soruları
