Dynamics of Machines solved MCQs

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1. Which of the following is incorrect regarding inertia force?

a. imaginary force

B. acts upon a rigid body

c. brings the body to equilibrium

d. same direction as of accelerating force

2. Inertia torque acts in the same direction as the accelerating couple?

a. true

B. false

3. If a force has a line of action at a distance h from the centre of gravity, then the value of h is given by            

a. i. α/f

B. i. α/m.g

c. i/m.k

d. m.k/i

4. D-Alembert’s principle is used for which of the following?

a. change static problem into a dynamic problem

B. change dynamic problem to static problem

c. to calculate moment of inertia of rigid bodies

d. to calculate angular momentum of a system of masses


a. reversed effective force

B. net force

c. coriolis force

d. resultant force

6. Why the inertia torque acts in the opposite direction to the accelerating couple?

a. bring the body in equilibrium

B. to reduce the accelerating torque

c. acts as a constraint torque

d. increase the linear acceleration

7. A body remains in equilibrium if                  

a. inertia force is applied in the same direction to the resultant force

B. inertia force is applied in the direction opposite to the resultant force

c. inertia force is applied in the direction perpendicular to the resultant force

d. inertia force is applied in the direction parallel to the resultant force

8. Inertia force and the reversed effective force are the same.

a. true

B. false

9. In the following picture the G is the center of gravity, the quantity h is known as the “offset”. I is the moment of inertia and k is the radius of gyration. Offset’s value is given by?

a. i.α/f

B. i.α/m.g

c. i/m.k

d. m.k/i

10. Considering a four bar chain with each link having linear and angular acceleration, applying D-Alembert’s principle will never result in which of the following member?

a. 2- force member

B. 3- force member

c. 4 – force member

d. non accelerating member

11. The net force acting on the crosshead pin is known as                      

a. crank pin effort

B. crank effort

c. piston effort

d. shaft effort

12. Piston effort acts along the line of stroke.

a. true

B. false

13. In a horizontal engine, reciprocating parts are accelerated when the piston moves from

a. tdc to bdc

B. bdc to tdc

c. midway to tdc

d. bdc to midway

14. In a horizontal engine, reciprocating parts are retarded when the piston moves from

a. tdc to bdc

B. bdc to tdc

c. midway to tdc

d. bdc to midway

15. When the piston is accelerated, the piston effort is given by which of the following the equation?

a. f(l) – f(i)

B. f(l) + f(i)

c. f(l) ± f(i)

d. f(l) – f(i) + r(f)

16. In the presence of frictional resistance, the expression for piston effort is                    

a. f(l) – f(i)

B. f(l) + f(i)

c. f(l) ± f(i) – r(f)

d. f(l) – f(i) + r(f)

17. Crank effort is the product of crank pin radius and                

a. thrust on sides

B. crankpin effort

c. force acting along connecting rod

d. piston effort

18. In a horizontal engine, the weight of the reciprocating parts also add/subtract to the piston effort.

a. true

B. false

19. For the given data of an Internal combustion engine : Mass of parts = 180 kg bore = 175 mm, length of stroke = 200 mm, engine speed = 500 r.p.m., length of connecting rod = 400 mm and crank angle = 60° from T.D.C, find the inertia force.

a. 17.56 n

B. 19.2 n

c. 18.53 n

d. 18.00 n

20. 45 N/mm2. The connecting rod length between centres is 1.2 m and the cylinder bore is 0.5 m. If the engine runs at 250 r.p.m. and if the effect of piston rod diameter is neglected, calculate the net load on piston.

a. 88000 n

B. 90560 n

c. 78036 n

d. 88357 n

21. 2 m and the cylinder bore is 0.5 m. engine runs at 250 r.p.m & 30° from T.D.C. Find the piston effort.

a. 32.4 kn

B. 35.2 kn

c. 37.3 kn d) 40.2 n

22. Multi cylinder engines are usually placed at an equal inclination to each other.

a. true

B. false

23. For a multicylinder engine, the coefficient of fluctuation of speed would vary with

a. number of cylinders

B. remains unaffected

c. length of connecting rod

d. input temperature

24. For a 4 cylinder engine, if the minimum speed of the engine is half the maximum speed, then coefficient of fluctuation is

a. 0.5

B. 1.5

c. 2

d. 0.66

25. In the turning moment diagram of a multicylinder engine, the work done during exhaust stroke is by              

a. the gases

B. on the gases

c. piston wall

d. valve


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