1) Which among the following involves designing of machine components concerning its shape and size?
a. Kinetics
b. Kinematics
c. Synthesis
d. All of the above
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2) What is meant by Kinetics?
a. It deals with the study of relative motion between different components of a machine
b. It deals with the forces acting on different components
c. It deals with the inertia forces acting on different components of the engine
d. All of the above
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Answer
Explanation
Related Ques
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ANSWER: It deals with the inertia forces acting on different components of the engine
Explanation:
No explanation is available for this question!
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3) Which of the following statements is/are true?
a. A resistant body transmits required motion and forces with deformation
b. Flexible links transmit compressive force
c. Structures transmit mechanical work
d. All of the above
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Answer
Explanation
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ANSWER: A resistant body transmits required motion and forces with deformation
Explanation:
No explanation is available for this question!
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4) Relative motion between links is more than one direction which is unpredictable is known as
a. completely constrained motion
b. incompletely constrained motion
c. successfully constrained motion
d. none of the above
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5) Shaft with taper key is an example of
a. incompletely constrained motion
b. completely constrained motion
c. successfully constrained motion
d. all of the above
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6) Which of the following statements is/are true?
1. Static force analysis does not consider inertia forces along with static forces
2. The SI unit of mass moment of inertia is kg/m2
3. Mass moment of inertia of a thin disc about its diameter is given by (mr2) / 2
a. Only 1
b. Only 2
c. Only 3
d. All the above statements are true
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7) According to D' Alembert's principle, the body is in equilibrium position if
a. inertia force is applied in the direction opposite to the resultant force
b. inertia force is applied in the same direction of the resultant force
c. both a. and b.
d. none of the above
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Answer
Explanation
Related Ques
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ANSWER: inertia force is applied in the direction opposite to the resultant force
Explanation:
No explanation is available for this question!
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8) What is the equivalent length of simple pendulum, when compound pendulum is converted into simple pendulum?
a. le = (k + l ) / l
b. le = l2 / (k2 + l2)
c. le = (k2 + l2) / l
d. none of the above
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9) A connecting rod has periodic time of 1.5 sec/cycle for one oscillation. Calculate radius of gyration, when centre of gravity is at a distance of 500 mm from the small end.
a. 0.1325 m
b. 0.1719 m
c. 0.0295 m
d. 0.555 m
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10) In the bifilar suspension system shown below if x = y, periodic oscillation tp is given as
a. (2πk / x2) √(l / g)
b. (2πk / xy) √(l / g)
c. (2πk) √(l / gxy)
d. (2πk / x) √(l / g)
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11) Which of the following condition is true for uniform wear theory?
a. p = constant
b. p/r = constant
c. p.r = constant
d. none of the above
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12) The frictional resistance (Tr) offered by the ring in flat pivot bearing is given as
a. 2 π μ p r δr
b. 2 π μ p r2 δr
c. 2/3 π μ p r δr
d. 2/3 π μ p r2 δr
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13) According to uniform wear theory, frictional torque transmitted in flat collar bearing is given as
a. 2/3 [ μ W (R1 - R2)]
b. 1/2 [ μ W (R1 + R2)]
c. 2/3 μ W [(R1 + R2) / (R1 - R2)]
d. none of the above
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14) Which theory is used to determine safe design of bearings?
a. Uniform wear theory
b. Uniform pressure theory
c. both a. and b.
d. none of the above
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15) Frictional torque transmitted by uniform wear theory is more than torque transmitted by uniform pressure theory
a. True
b. False
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16) Double block brake is a type of
a. Band brake
b. Internal expanding shoe brake
c. Shoe brake
d. None of the above
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17) Which energy is absorbed by the brakes of an elevator during braking process?
a. Potential energy
b. Kinetic energy
c. Both a. and b.
d. None of the above
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18) In single shoe brake, when is uniform normal pressure observed between block and drum?
a. θ < 60o
b. 2θ < 90o
c. 2θ < 60o
d. θ > 30o
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19) Which type of brakes have wooden blocks placed inside flexible steel band?
a. Block brake
b. Band brake
c. Band and Block brake
d. Pivoted block brake
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20) In the equation Rn = (pl) / (x – μ.a), if x < μ.a then the brakes are
a. self energizing
b. self locking
c. self starting
d. None of the above
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21) According to loop closure equation, in a closed loop mechanism the sum of relative position vectors for the links is
a. less than 1
b. zero
c. greater than 1
d. none of the above
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22) Why is double Hooke's joint used?
a. To obtain uniform velocity ratio
b. To obtain variable velocity ratio
c. Both a. and b.
d. None of the above
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23) In IC engine mechanism, which formula is used to calculate acceleration of the piston?
a. ω2 r (cos θ + cos θ / n)
b. ω2 r (cos θ + cos 2θ / n)
c. ω2 r (cos θ - cos θ / n)
d. ω2 r (cos θ - cos 2θ / n)
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24) (ω cos θ) / n is the formula used to calculate
a. angular velocity of connecting rod
b. velocity of piston
c. angular acceleration of connecting rod
d. All of the above
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25) Match the following Group 1 items with Group 2 items
1. Displacement of piston -------------------------------------- A. - (ω2 /n) sin θ
2. Angular velocity of connecting rod ----------------------- B. [ω r (sin θ + sin 2θ / 2n)]
3. Angular acceleration of connecting rod ------------------ C. r [1 + n – cos θ - √(n2 – sin2 θ)]
4. Velocity of piston --------------------------------------------- D. ω cos θ / √( n2 – sin2 θ)
a. 1 – A, 2 – C, 3 – D, 4 - B
b. 1 – D, 2 – B, 3 – A, 4 - C
c. 1 – C, 2 – D, 3 – A, 4 - B
d. 1 – C, 2 – A, 3 – D, 4 - B
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26) Which of the following kinematic pairs is classified depending upon the mechanical arrangement between the links?
a. Primatic pair
b. Revolute pair
c. Force closed pair
d. Sliding pair
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27) Match the following Group 1 items (Kinematic pairs) with Group 2 items (Examples) and select the correct option
1. Revolute pair ----------------------------------------------- A. Ball bearing
2. Helical pair ------------------------------------------------- B. Ball and socket
3. Rolling pair ------------------------------------------------- C. Lathe spindle in the head stock
4. Globular pair ----------------------------------------------- D. Motion between bolt and fixed nut
a. 1 – D, 2 – A, 3 – C, 4 – B
b. 1 – B, 2 – D, 3 – A, 4 – C
c. 1 – C, 2 – D, 3 – A, 4 – B
d. 1 – A, 2 – C, 3 – D, 4 – B
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28) Which pairs are considered as higher pairs?
a. When transmitting motion, two links have line or point contact between them
b. When transmitting motion, two links have surface contact or line contact between them
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Answer
Explanation
Related Ques
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ANSWER: When transmitting motion, two links have line or point contact between them
Explanation:
No explanation is available for this question!
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29) Cam and follower is an example of
a. force closed pair
b. unclosed pair
c. open pairs
d. all of the above
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30) The equation j = (3/2)n – 2 represents relation between number of joints (L.H.S) and number of links (R.H.S). The chain is constrained if
a. L.H.S = R.H.S
b. L.H.S < R.H.S
c. L.H.S > R.H.S
d. None of the above
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