Inertia Forces in Reciprocating Parts topics include: Kliens, bennetts and ritterhaus construction, velocity and acceleration of engines, reciprocating parts of engines. Inertia forces in reciprocating parts are caused by the oscillation of reciprocating masses. These forces act along the line of stroke and through the cross head on the structures and on the main bearing of the crankshaft.  The inertia force due to the acceleration of the reciprocating parts opposes the force on the piston. The inertia force due to retardation of the reciprocating parts helps the force on the piston.  The... Show more

Inertia Forces in Reciprocating Parts topics include: Kliens, bennetts and ritterhaus construction, velocity and acceleration of engines, reciprocating parts of engines.

Inertia forces in reciprocating parts are caused by the oscillation of reciprocating masses. These forces act along the line of stroke and through the cross head on the structures and on the main bearing of the crankshaft. 

The inertia force due to the acceleration of the reciprocating parts opposes the force on the piston. The inertia force due to retardation of the reciprocating parts helps the force on the piston. 
The inertial force of mass can be calculated by multiplying the object's mass by its acceleration. 
Balancing is a method of correcting or eliminating unwanted inertia forces and couples in rotating and reciprocating parts of the machine.

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Machine Dynamics Practice Test: Inertia Forces in Reciprocating Parts

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25 Questions

1. Klein’s constructions can be used to determine the acceleration of various parts at all locations.

FalseMaybeTrueDon't Know

2. In a slider crank mechanism, the length of the crank and connecting rod are 180 mm and 540 mm respectively. The crank position is 45° from inner dead centre. The crank shaft speed is 450 r.p.m. (clockwise), calculate angular velocity of the connecting rod in rad/s.

11.810.312.211.1

3. 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?

3- force member4 – force memberNon accelerating member2- force member

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

BDC to TDCTDC to BDCBDC to midwayMidway to TDC

5. From figure, what is the absolute velocity of P, i.e velocity of P with respect to the stationary point O?

ω × OCω × OMω × CMω × QN

6. From figure, what is the velocity of P with respect to C?

ω × CMω × OMω × OCω × QN

7. 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 _____

I. α/Fm.k/II. α/m.gI/m.k

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

Piston effortShaft effortCrank effortCrank pin effort

9. If OC is the crank and PC is the connecting rod rotating in clockwise direction in the figure given below, then triangle OCM is known as ________

Ritterhaus’ acceleration diagramRitterhaus’ velocity diagramKlein’s velocity diagramKlein’s acceleration diagram

10. Which of the following expression represent the angular acceleration α of the connecting rod?

ω2. cos θ/n−ω2 . cos θ.n−ω2 . sin θ/nω2 . sin θ.n

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

FalseMaybeDon't KnowTrue

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

To calculate moment of inertia of rigid bodiesChange dynamic problem to static problemTo calculate angular momentum of a system of massesChange static problem into a dynamic problem

13. From figure, acceleration of P with respect to C is given by_________

ω2.PCω2.OMω2.QNω2.CN

14. Bennett’ construction is used when the motion of the crank is linear cycloidal.

Don't KnowFalseMaybeTrue

15. A body remains in equilibrium if ________

Inertia force is applied in the direction Perpendicular to the resultant forceInertia force is applied in the same direction to the resultant forceInertia force is applied in the direction Parallel to the resultant forceInertia force is applied in the direction opposite to the resultant force

16. Ritterhaus’ construction is used to determine graphically the velocity and acceleration of reciprocating parts of an IC engine.

Don't KnowMaybeFalseTrue

17. From the data given:
Crank and connecting rod of a steam engine are 0.3 m and 1.5 m in length; The crank rotates at 150 r.p.m. clockwise.
Determine the acceleration in m/s² of the piston for the same position(angle 40 degrees from IDC).

65.355.2550.4159.27

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

Acts as a constraint torqueIncrease the linear accelerationTo reduce the accelerating torqueBring the body in equilibrium

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

F(L) ± F(I)F(L) – F(I) + R(f)F(L) + F(I)F(L) – F(I)

20. For a slider crank mechanism, the total no. of dead centres are _____

1032

21. From figure, what is the velocity of P with respect to C?

ω × OMω × OCω × CMω × QN

22. With respect to the figure given quadrilateral CQNO is known as _______

Bennet’s diagramKlein’s velocity diagramKlein’s displacement diagramKlein’s acceleration diagram

23. In which of the following cases Bennett’s construction can be used?

Crank has a uniform angular accelerationWhen the motion is SHMCrank has a uniform angular velocityLever has a uniform angular acceleration

24. In the expression F – m.a = 0, the term – m.a is called _______

Resultant forceCoriolis forceNet forceReversed effective force

25. Crank effort is the product of crank pin radius and _______

Force acting along connecting rodThrust on sidesCrankpin effortPiston effort