Worksheetsunit 1 force analysis
Total questions: 25
Worksheet time: 25mins
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. 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
3. In the expression F – m.a = 0, the term – m.a is called _______
a) Reversed effective force
b) Net force
c) Coriolis force
d) Resultant force
4. 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
5. In which of the following cases Klein’s construction can be used?
a) Crank has a uniform angular velocity
b) Crank has a uniform angular acceleration
c) Lever has a uniform angular acceleration
d) When the motion is SHM
6. When the acceleration of the piston is 0, then the velocity is _____
a) Maximum
b) Minimum
c) Negative
d) Half the maximum
7. In given figure, Triangle OCM is known as ________
a) Klein’s acceleration diagram
b) Klein’s velocity diagram
c) Klein’s displacement diagram
d) Bennet’s diagram
8. A Piston will remain 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
9. If the crank and the connecting rod are 300 mm and 1 m long respectively and the crank rotates at a constant speed of 250 r.p.m., determine the crank angle at which the maximum velocity occurs is ____
a) 45
b) 75
c) 90
d) 60
3. The 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 velocity of the piston when the crank is at an angle 40 degrees from IDC.
a) 4.19
b) 5
c) 3.49
d) 3.36
11. 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).
a) 59.27
b) 55.25
c) 65.3
d) 50.41
12. Which of the following expression represent the angular acceleration α of the connecting rod?
a) −ω2 . sin θ/n
b) −ω2 . cos θ.n
c) ω2. cos θ/n
d) ω2 . sin θ.n
13. The net force acting on the crosshead pin is known as __________
a) Crank pin effort
b) Crank effort
c) Piston effort
d) Shaft effort
14. 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)
15. 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
16. 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
17. Correction couple is applied when masses are placed arbitrarily and to maintain _________
a) Static equilibrium
b) Dynamic equilibrium
c) Stable equilibrium
d) Unstable equilibrium
18. Force which does not act on the connecting rod is ______
a) Weight of connecting rod
b) Inertia force of connecting rod
c) Radial force
d) Coriolis force
19. When engine torque is more than mean resisting torque, then the flywheel _______
a) Has uniform velocity
b) Has 0 velocity
c) Has acceleration
d) Has retardation
20. Area of the turning moment diagram represents _______
a) Work done
b) Work done per revolution
c) Power generated
d) Power generated per revolution
21. When the work is by on the gases, which of the following effect is observed on the turning moment diagram?
a) Formation of negative loop
b) Formation of positive loop
c) Formation of an infinite loop
d) Formation of no loop
22. Coefficient of fluctuation of energy is ratio of _______
a) Mean fluctuation energy to work done per cycle
b) Maximum fluctuation energy to work done per cycle
c) Minimum fluctuation energy to work done per cycle
d) Mean fluctuation energy to power generated per cycle
23. For a 4 stroke IC engine, Tmean = 1875 N-m, then find the work done per cycle.
a) 23.56 kJ
b) 11.78 kJ
c) 5.89 kJ
d) 2.94 kJ
24. The moment of inertia of a flywheel is 6500 kg-m2, from the turning moment diagram, it is found that fluctuation of energy is 56000 N-m, if mean speed is 120 rpm, then find maximum speed.
a) 121
b) 119
c) 122
d)118
25. The flywheel of a steam engine has a mass moment of inertia of 2500 Kg-m2. The starting torque of the steam engine is 1500 N-m and may be assumed constant, using this data find the angular acceleration of the flywheel in rad/s2.
a) 0.4
b) 0.6
c) 0.3
d) 1.2
