1) 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
2) On which factors does law of friction depend?
a. Nature of material
b. Area of contact between surfaces
c. Velocity of sliding
d. All of the above
3) What are crank effort diagrams?
a. Turning moment diagram is drawn on cartesian co-
ordinates
b. Turning moment diagram is drawn on polar co-ordinates
c. Turning moment (T) is plotted against crank angle θ for
various crank positions
d. All of the above
4) Which of the following conditions should be satisfied for a two
point mass statistically equivalent system?
1. m = m1 + m2
2. m1 l2 = m2 l1
3. m1 l1 = m2 l2
4. IG = IG1 + IG2
a.Condition 1 and condition 2
b. Condition 1 and condition 3
c. Condition 2 and condition 4
d. All the above conditions should be satisfied
5) What is meant by contact ratio in gears?
a.Ratio of length of arc of approach and circular pitch
b. Ratio of circular pitch and length of arc of contact
c. Ratio of length of arc of recess and circular pitch
d. Ratio of length of arc of contact and circular pitch
6) In involute gears what is the effect of center distance variation
on velocity ratio?
a.Velocity ratio increases
b. Velocity ratio decreases
c. It has no effect on velocity ratio
d. None of the above
7) For a simple gear train, velocity ratio is the ratio of
a.Speed of driving shaft and speed of driven shaft
b. Speed of driven shaft and speed of driving shaft
c. Speed of driven shaft and (speed of driving shaft + speed of
idler gears)
d. Speed of driving shaft and (speed of driven shaft + speed of
idler gears
8) Which type of gear box is used in automobiles?
a.Sliding mesh gear box
b. Differential gear box
c. Synchromesh gear box
d. All of the above
9) The balancing of rotating and reciprocating parts of an engine is necessary when it runs
at:
a.slow speed
b.medium speed
c.high speed
d.none of the mentioned
10) A system in dynamic balance implies that
(a)the system is critically damped
(b)there is no critical speed in the system
(c)the system is also statically balanced
(d)there will absolutely no wear of bearings
11) The unbalanced primary couple caused due to reciprocating
mass of each cylinder is given as
a.mrlω2 cos θ
b. mrlω (cos θ / n)
c. mrlω2 cos 2θ
d. mrω2 cos 2θ
12) At which angle primary unbalanced force in reciprocating engine
mechanism is maximum?
a.0o
b. 90o
c. 360o
d. All of the above
13) According to D' Alembert's principle, m (d2x/ dt2) + c (dx/dt) + Kx
=0 is the differential equation for damped free vibrations having
single degree of freedom. What will be the solution to this
differential equation if the system is critically damped?
a.x = (A + Bt) e– ωt
b. x = X e– ξωt (sin ωdt + Φ)
c. x = (A – Bt) e– ωt
d. x = X e– ξωt (cos ωdt + Φ)
14) What is meant by critical damping coefficient?
a.Frequency of damped free vibrations is less than zero
b. The motion is aperiodic in nature
c. Both a. and b.
d. None of the above
15) What is the effect of damping on phase angle at resonance
frequency?
a.Phase angle increases as damping increases
b. Damping has no effect on phase angle
c. Phase angle increases as damping decreases
d. None of the above
16) At which frequency ratio, phase angle increases as damping
factor increases?
a.When frequency ratio is less than unity
b. When frequency ratio is more than unity
c. When frequency ratio is zero
d. All of the above
In a Reciprocating steam engine, which of the following forms a Kinematic links
(a) Cylinder and Piston (b) Piston rod and Connecting rod
17
(c ) Crankshaft and Flywheel (d) Flywheel and Engine frame
The motion between a pair when limited to a definite direction, irrespective of the direction of
force applied is known as
18 (a) Completely constrained motion (b) incompletely constrained motion
(c ) successfully constrained motion (d) None of these
19 When the nature of contact between the element of a pair is such that one element can turn about
the other by screw thread, the pair is known as a
(a) Screw pair (b) Spherical pair
(c ) turning pair (d) Sliding pair
The motion of a shaft in a circular hole is an example of
20 (b) Completely constrained motion (b) incompletely constrained motion
(c ) ) successfully constrained motion (d) none of these
