# Theory of Machines - 1 Test Questions - Set 1

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
 Answer  Explanation  Related Ques ANSWER: Synthesis Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: It deals with the inertia forces acting on different components of the engine Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: A resistant body transmits required motion and forces with deformation Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: incompletely constrained motion Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: successfully constrained motion Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: Only 1 Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: inertia force is applied in the direction opposite to the resultant force Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: le = (k2 + l2) / l Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: 0.1719 m Explanation: No explanation is available for this question!

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)
 Answer  Explanation  Related Ques ANSWER: (2πk / x) √(l / g) Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: p.r = constant Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: 2 π μ p r δr Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: 1/2 [ μ W (R1 + R2)] Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: Uniform pressure theory Explanation: No explanation is available for this question!

15)   Frictional torque transmitted by uniform wear theory is more than torque transmitted by uniform pressure theory

a. True
b. False

 Answer  Explanation  Related Ques ANSWER: False Explanation: No explanation is available for this question!

16)   Double block brake is a type of

a. Band brake
b. Internal expanding shoe brake
c. Shoe brake
d. None of the above
 Answer  Explanation  Related Ques ANSWER: Shoe brake Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: Potential energy Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: 2θ < 60o Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: Band and Block brake Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: self locking Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: zero Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: To obtain uniform velocity ratio Explanation: No explanation is available for this question!

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)
 Answer  Explanation  Related Ques ANSWER: ω2 r (cos θ + cos 2θ / n) Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: angular velocity of connecting rod Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: 1 – C, 2 – D, 3 – A, 4 - B Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: Force closed pair Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: 1 – C, 2 – D, 3 – A, 4 – B Explanation: No explanation is available for this question!

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

 Answer  Explanation  Related Ques ANSWER: When transmitting motion, two links have line or point contact between them Explanation: No explanation is available for this question!

29)   Cam and follower is an example of

a. force closed pair
b. unclosed pair
c. open pairs
d. all of the above
 Answer  Explanation  Related Ques ANSWER: all of the above Explanation: No explanation is available for this question!

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
 Answer  Explanation  Related Ques ANSWER: L.H.S = R.H.S Explanation: No explanation is available for this question!