MCQ for Unit 2
MCQ for Unit 2
By, Prof. R.S. Chaudhari.
Asst. professor
Mechanical Engineering Department
Q.1
Inertia force acts _____.
(a) perpendicular to the accelerate force.
(b) along the direction of acceleforce.
(c) opposite to the direction of accelerate force.
(d) in any direction w.r.t. accelerate force depending on the
magnet two.
Q.2
A rigid body is Said to be in equilibrium if
________.
Q.3
In simple harmonic motion _________.
•
(a) the acceleration is inversely proportional to
displacement.
•
(b) the acceleration is always equal to zero.
•
(c) the acceleration is directly proportional to
displacement.
•
(d) none of the above
Q.4 In a simple pendulum the time of oscillation
depeds upon ________.
•
(a) mass of the pendulum and the length of the
pendulum
•
(b) mass of the pendulum and the local
acceleration due to gravity
•
(c) total acceleration due to gravity and length of
pendulum
•
(d) mass of the pendulum, the length of pendulum
ad the blocal acceleration due to gravity
.
Q.5 In simple Harmonic Motion the acceleration is----
-----
•
a) directly proportional to displacement
•
b) inversely proportional to displacement
•
c) directly proportional to velocity
•
d) inversely proportional to velocity
6 If the radius of gyration of a compound pendulum
about an axis through C.G. is more, then its frequency
of oscillation will be……………..
•
a) less
•
b) more
•
c) same
•
d) data are insufficient to determine same
Q.7 The Bifilar suspention method is used to
determine……………
•
a) natural frequency of vibration
•
b) position of balancing weights
•
c) moment of inertia
•
d)centripetal acceleration
Q.8 The simple method to find mass moment of
inertia of connecting is………
•
a) compound pendulam
•
b) Bifilar suspention
•
c)Trifilar suspention
•
d) All of above
Q.9 The mass moment of inertia of flywheel can be
determine
by ________.
•
a) Compound pendulum
•
b) Bifilar suspention
•
c) Trifilar suspention
•
d) All of above
Q.10 The period of oscillation of bifilar
suspention system is given by……..
Q.11 In bifilar suspention system if two wires are attached are
equal distance from C.G. of rigid body then period of osciiilation
is given by……..
Q.12 The period of oscillation of trifilar
suspension system is given by…….
Q. 13 If k = radius of gyration of compound pendulum
about axis through C.G., l = distance of C.G. from axis of
suspension, then the period of oscillation of the
compound pendulum will be________.
Q. 14 Acompound pendulum can be treated for
analysis as simple pendulum if _________.
•
(a) length of compound pendulum is same as that of
simple pendulum
•
(b) mass of compound pendulum is same as that of
simple pendulum
•
(c) time period of oscillation of compound pendulum
is same as that of
simple pendulum
•
(d) compound pendulum and simple pendulum give
time period of oscillation of only 1 sec
Q. 15 When l=k, the time period of oscillation of
compound pendulum is _________
•
(a) maximum
•
(b) minimum
•
(c) zero
•
(d) 1 sec
Q. 16 The minimum time period of oscillation of
compound pendulum is ________
Q. 17 A connecting rod of mass 5kg is placed on a platform
whose mass is 3kg, it suspended by 3 equal wires each 1.5m
long from a rigid support. The wires are equally spaced
along the circumference of a circle 150mm radius. When
the C.G. of connecting rod coincides with axis of circle and
platform makes 15 oscillations in 40 sec, find the M.I. of the
system.
•
(a) 0.3162
•
b) 0.2107
•
(c) 0.4108
•
(d) 0.1078
Q. 18 A connecting rod of mass 3kg oscillates 50 times in
one minute when suspended at a small end. Find its mass
moment of inertia about the axis passing through its centre
of gravity which is located at 300mm from small end.
•
(a) 0.012
•
(b) 0.023
•
(c) 0.042
•
(d) 0.052
Q.19 A connecting rod of mass 3.5kg is suspended by two wires
each of 2m length. The wires are attached to the rod at points
150mm on either side of the centre of gravity. If the connecting
rod makes 35 oscillations in 60 seconds. Find the radius of
gyration and the mass moment of inertia of the connecting rod
about its centre of gravity.
•
(a) 0.0287
•
(b) 0.0187
•
(c) 0.0365
•
(d) 0.0485
Q. 20 A rigid body can be replaced by two masses, connected
rigidly together. The system of two masses will be dynamically
equivalent to the rigid body if
•
(a) the mass of the two system are the same
•
(b) the centre of gravity of the two mass system coincides
with the centre of gravity of the rigid body
•
(c) the total mass moment of inertia of the two mass system
about an axis through the centre of gravity is equal to that of
rigid body about the same axis
•
(d) all of the above
Q.21 A rigid body , under the action of external forces, can be
replaced by two masses placed at a fixed distance apart. The two
masses form an equivalent dynamical system, if
•
(a) the sum of two masses is equal to the total mass of the
body
•
(b) the centre of gravity of the two masses coincide with that
of the body
•
(c) the sum of mass moment of inertia of the masses about
their centre of gravity is equal to the mass moment of inertia
of the body
•
(d) all of the above
Q.22 Any distributed mass can be replaced by two
point masses to have the same dynamical properties if
•
(a) the sum of the two masses is equal to the total mass
•
(b) the combined centre of mass coincides with that of
the mass
•
(c) the moment of inertia of two masses about
perpendicular axis through their combined centre of
mass is equal to that of the rod.
•
(d) all of the above.
Q.23 The rigid body is replaced by two concentrated
masses rigidly connected together. The system will be
kinematically equivalent of the body if
•
(a) the mass of two masses is equal to the mass of
rigid body
•
(b) the centre of gravity of two mass system
coincides with the centre of gravity of rigid body
•
(c) the mass moment of inertia of the two mass
system and the rigid body about centre of gravity are
equal
•
(d ) all of the above.
Q.24 Which one of the following conditions is satisfied for a
system to be dynamically equivalent?
•
(a)
l
1
.l
2
=k
2
•
(b)
l
1
+l
2
=k
2
•
(c)
l
1
-l
2
=k
2
•
(d)
l
1
.l
2
=k
2
Where
l and l =distance of two masses from C.G of the body,
and
k= radius of gyration of the body.
Q. 25 Fig. 1 shows a rigid body of a mass m having radius of
gyration K about its centre of gravity. It is to be replaced by
in equivalent dynamical system of two masses placed at A
and B. The mass at A should be
Q. 26 Figure shows a rigid body of mass m having a radius
of gyration K about its centre of gravity. It is to be replaced
by in equivalent dynamical system of two masses placed at
A and B. The mass at B should be
•
(a) a*m/(a+b)
•
(b) b*m/(a+b)
•
(c) m/2
•
(d) m/3
Q. 27 Refer figure the mass of rigid body is m and radius of
gyration is K. The kinetically equivalent system shows masses m1
and m2. The mass m1 should be _________.
•
(a)m1= ml2/(l1+l2)
•
(b)m1= ml1/(l1+l2)
•
(c)m1= m(l1l2)/ l1+l2
•
(d) m1= (l2/l1+l2)m2
Q. 28 Refer figure the mass of rigid body is m and radius of
gyration is K. The kinetically equivalent system shows masses m1
and m2. The mass m2 should be
•
(a) m2= ml2/(l1+l2)
•
(b) m2= ml1/(l1+l2)
•
(c) m2= m(l1l2)/ l1+l2
•
(d) m1= (l2/l1+l2)m2
Q. 29 Two systems shall be dynamically equivalent
when
•
(a) the mass of two are same
•
(b) example of two coincides
•
(c) M.I. of two about an axis through example is
equal
•
(d) All of the above
Q. 30 The essential condition of placing the two masses, so
that the system becomes dynamically equivalent is
•
(a) L1.l2 = kG2
•
(b) L1.l2=kG
•
(c) L1=kG
•
(d) L2=kG
•
Where
•
l
1
andl
2
= distance of two masses from the centre of
gravity of the body,
k
G
= radius of gyration of the body
Q. 31 For a link to be dynamically equivalent
which condition needs to be satisfied?
(a)
K
2
=l
1
/l
2
(b)
K
2
=l
2
/l
1
(c)
K
2
=l
1
/l
2
(d)
K
2
=l
1
+l
2
Q. 32 In a dynamically equivalent system, a uniformly
distributed mass is divided into _________ point masses.
•
(a) Two
•
(b) Three
•
(c) Four
•
(d) Five
Q. 33 If m is the mass of connecting rod , k is the radius of
gyration of connecting rod, k1 is the new radius of gyration of
connecting rod, and α is the angular acceleration of connecting
rod than correction couple is given by __________.
•
(a)
TC=m[k2-k12]
α
•
(
b)
TC=m[k12-k2]
α
•
(
c)
TC=m[k12k2]
α
•
(
d)
TC=m/
α [
k12-k2]
Q.34 Crank effort is the net force applied at the crankpin
___________ to the crank which gives the required turning
moment on the crankshaft.
•
Parallel
•
Perpendicular
•
At 45
0
•
135
0
Q.35 In a reciprocating horizontal engiene the inertia force
due to reciprocating mass helps the piston effort at
_________
Q.36 State which of the following statement is true ?
•
(a) The inertia force is equal in magnitude and opposite in
direction to accelerating force
•
(b) The magnitude of inertia force is give by the expression
F1= mr ω^2r (cos θ + cos2θ/(2 n))
Where Symbols have their meaning
•
(c) D-Alembert’s principle is used to reduce a dynamic
problem into an equivalent static problem
•
(d) All are true statements
Q.37 In horizontal engine piston effort is given by
________.
Q.40 If FQ is the force acting on connecting rod,Ф is the
obliquity angle of connecting rod and Q is the angle made
by crank, the radial force acting along the crank shaft FR is
_________
•
(a) FQ sin (Ѳ + Ф)
•
(b) FQ sin (Ѳ - Ф)
•
(c) FQ cos (Ѳ + Ф)
•
(d) FQ cos (Ѳ + Ф)
Q.42 The turning moment of crank shaft is _________.
Q. 43 If P is the piston effort and Ф is the obliquity angle of
connecting rod, the expression for thrust in connecting rod
is _________
Q. 44 If piston effort of 100kN is acting and crank is made
45° from TDC and obliquity ratio is 2, then the thrust in
connecting rod is _________.
•
(a) 110 kN
•
(b) 106.9kN
•
(c) 95.2kN
•
(d) 109.70
Q.45 If the piston effort of 100kN is acting and crank is
made 45° from TDC and obliquity ratio is two then the
piston side thrust is _________.
•
(a) 38.40
•
(b) 35.40
•
(c) 36.58
•
(d) 37.78
Q.46 If piston effort of 100kN is acting and crank is made
45’ from TDC and obliquity ratio is 2, then tangential force
acting on crank shaft is ___________.
•
(a) 95.42
•
(b) 97.42
•
(c) 93.42
•
(d) 92.38
Q. 47 If piston effort of 100kN is acting and crank is made
45’ from TDC and obliquity ratio is 2, then radial force or
load on main bearing is ____________.
•
(a) 44.99
•
(b) 42.99
•
(c) 43.99
•
(d) 41.99
Q. 48 The tangential force acting on engine is 100kN and
radius of crank is 500mm, the torque acting on crank is
__________.
•
(a) 60kN.m
•
(b) 50kN.m
•
(c) 45kN.m
•
(d) 55kN.m
Q. 49 According to the law of dryness friction, the force of
friction ___________.
•
(a) Is independent of area of contact.
•
(b) Is directly proportional to the normal pressure
between the surface of contact.
•
(c) Is independent of velocity of sliding.
•
(d) Is dependent on material of bodies in contact.
•
(e) All of the above.
Q. 50 Which of the following statements is true when
__________.
•
(a) tan ∅= µ body will move over the surface
•
(b) tan ∅> µ the motion of body over the surface is
not possible
•
(c) tan ∅ cannot be smaller than µ
•
(d) tan ∅< µ the motion of body over the surface is
not possible
Q. 51 Angle of inclination of plane at which body starts
moving downwardsis called as _________.
•
(a) Angle of projection
•
(b) Horizontal angle
•
(c) Angle of friction
•
(d) angle of repose
Q. 52 If the angle of friction is tan ∅, then which of the
following cannot be the value of tan ∅
•
(a) 0.1 µ
•
(b) 0.5 µ
•
(c) µ
•
(d) 1.5 µ
Q. 53 Shaft of radius r is revolving inside a bearing then
radius of friction angle is given by ________.
•
(a) r sin ∅
•
(b) r tan ∅
•
(c) r cos ∅
•
(d) r cot ∅
Q. 54 Boundary film lubrication is _________.
(a) thin film lubrication
•
(b) thick film lubrication
•
(c) solid lubrication
•
(d) none of the above
Q. 55 When a journal is rotating in its bearing the resultant
of the normal force (RN) and frictional force (µRN)
_________.
•
(a) Passes through the centre of the journal
•
(b) Is tangent to the circle of the jurnal at the point of
contact
•
(c) Is tangent to a small circle of radius r x sin∅ where
∅= tan^(-1)µ
•
(d) None of the above
Q.56
Friction circle in case of journal bearig is
___________.
•
(a) the circle in which resultant force of F is tangent.
•
(b) the circle which is having radius equal to half of
the radius of the journal.
•
(c) the circle which is having radius equal to µ x R
where R is the radius of the journal.
•
(d) both (a) and (c).
Q.57 The radius of friction circle increases _________.
•
(a) with the increases of radius of journal.
•
(b) with the increase of speed.
•
(c) with the increase of coefficient of sliding friction.
•
(d) (a) and (c) only.
Q.58
A friction circle is a circle drawn when the journal
rotates in a bearing. Its radius depends on the coefficient of
friction and ________
•
(a) magnitude of the forces on the journal.
•
(b) angular velocity of the journal.
•
(c) clearance between the journal and the bearing.
•
(d) radius of the journal.
Q.59 The tendancy of a body to resist change from rest or
motion is known as _________.
•
(a) mass
•
(b) friction
•
(c) inertia
•
(d) resisting force.
Q.60
The friction force, which comes into play, when the
sliding motion of the body is just to commence, is called
___________.
•
(a) static friction
•
(b) dynamic friction
•
(c) limiting friction
•
(d) none of these
Q.61
The kinematic friction is the friction experienced by a
body, when the body __________.
•
(a) is at rest
•
(b) just beings to slide
•
(c) is in motion
•
(d) none of these
Q.62
The radius of a friction circle for a shaft of a radius r,,
rotating slide a bearing with cefficient, of friction µ = tanØ,
is ________.
•
(a) (r/2) tan Ø
•
(b) r . sin Ø
•
(c) r . cos Ø
•
(d) r/2 sin Ø
Q.63
The friction force is independent of _________.
•
(a) material
•
(b) area of contact
•
(c) normal reaction
•
(d) surface finish
Q.64 Choose the correct statement.
•
(a) The force of friction always opposes the relative
motion of one surface over another.
•
(b) The force of friction is directly proportional to
normal load between surfaces in contact.
•
(c) The force of friction is independent of are as of
contact between the surfaces for a given load.
•
(d) All of the above.
Q.65 Choose the correct statement.
•
(a) static friction is greater than dynamic friction.
•
(b) Angle of friction is the angle included between
the direction of normal reaction and direction of
resultant reaction when a body is at impeding slide
on the plane.
•
(c) Angle of repose is equal to angle included
between the direction of normal reaction and
direction of resultant reaction when a body is at
impeding slide on the plane.
•
(d) All of the above.
Q.66 The radius of the friction circle ____________.
•
(a) increases as the load increases.
•
(b) increases as the radius of journal increases.
•
(c) increases as the speed of the shaft in journal
increases.
•
(d) increases as the coefficient of friction increases
Q.67
The radius of friction circle for a shaft rotating inside
a bearing of radius r is equal to ______.
•
(a) r sin Ø
•
(b) r cos Ø
•
(c) r
•
(d) r/cos Ø
Q.68 When journal is rotating , the resultant of the normal
force Rn and tangential force µRn ______
•
(a) passes approximately through the centre of
journal
•
(b) approximately tangential to the circle of the
journal of radius r at contact point
•
(c) is approximately tangential to the small circle of
radius = µr
•
(d) none of the above
In this MCQ set for Unit 2, explore questions on inertia force, equilibrium of rigid bodies, simple harmonic motion, pendulum oscillation, and more. Test your knowledge in mechanical engineering with these multiple-choice questions.
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MCQ for Unit 2 By, Prof. R.S. Chaudhari. Asst. professor Mechanical Engineering Department
Q.1 Inertia force acts _____. (a) perpendicular to the accelerate force. (b) along the direction of acceleforce. (c) opposite to the direction of accelerate force. (d) in any direction w.r.t. accelerate force depending on the magnet two.
Q.2 A rigid body is Said to be in equilibrium if ________. (a) ??=0. (b) ??=0 (c) ??=0 (d) all of the above
Q.3 In simple harmonic motion _________. (a) the acceleration is inversely proportional to displacement. (b) the acceleration is always equal to zero. (c) the acceleration is directly proportional to displacement. (d) none of the above
Q.4 In a simple pendulum the time of oscillation depeds upon ________. (a) mass of the pendulum and the length of the pendulum (b) mass of the pendulum and the local acceleration due to gravity (c) total acceleration due to gravity and length of pendulum (d) mass of the pendulum, the length of pendulum ad the blocal acceleration due to gravity.
Q.5 In simple Harmonic Motion the acceleration is---- ----- a) directly proportional to displacement b) inversely proportional to displacement c) directly proportional to velocity d) inversely proportional to velocity
6 If the radius of gyration of a compound pendulum about an axis through C.G. is more, then its frequency of oscillation will be .. a) less b) more c) same d) data are insufficient to determine same
Q.7 The Bifilar suspention method is used to determine a) natural frequency of vibration b) position of balancing weights c) moment of inertia d)centripetal acceleration
Q.8 The simple method to find mass moment of inertia of connecting is a) compound pendulam b) Bifilar suspention c)Trifilar suspention d) All of above
Q.9 The mass moment of inertia of flywheel can be determine by ________. a) Compound pendulum b) Bifilar suspention c) Trifilar suspention d) All of above
Q.10 The period of oscillation of bifilar suspention system is given by .. a) tp=2?? ? ? ?? b) tp=??? ? ??? c ) tp=2?? ?? ? ? d) tp=2?? ? ? ??
Q.11 In bifilar suspention system if two wires are attached are equal distance from C.G. of rigid body then period of osciiilation is given by .. a) tp=2?? ? ? b) tp=2? ?? ? c) tp=2? ? ?? d) tp=2?? ? ?
Q.12 The period of oscillation of trifilar suspension system is given by . a) tp=2?? ? ?? b) tp=2?? ? ? ? c) tp=??? ? ? ? d) tp=2?? ? ? ?
Q. 13 If k = radius of gyration of compound pendulum about axis through C.G., l = distance of C.G. from axis of suspension, then the period of oscillation of the compound pendulum will be________. (a) 2? ? ? ?(b) 2? ?2+?2 ?2+?2(d) 2? ??+?? ? (c) 2? ??
Q. 14 Acompound pendulum can be treated for analysis as simple pendulum if _________. (a) length of compound pendulum is same as that of simple pendulum (b) mass of compound pendulum is same as that of simple pendulum (c) time period of oscillation of compound pendulum is same as that of simple pendulum (d) compound pendulum and simple pendulum give time period of oscillation of only 1 sec
Q. 15 When l=k, the time period of oscillation of compound pendulum is _________ (a) maximum (b) minimum (c) zero (d) 1 sec
Q. 16 The minimum time period of oscillation of compound pendulum is ________ (a) 2? ?? ? (b) 2? ? ? (c) 2? ? ? (d) 2? ? 2?
Q. 17 A connecting rod of mass 5kg is placed on a platform whose mass is 3kg, it suspended by 3 equal wires each 1.5m long from a rigid support. The wires are equally spaced along the circumference of a circle 150mm radius. When the C.G. of connecting rod coincides with axis of circle and platform makes 15 oscillations in 40 sec, find the M.I. of the system. (a) 0.3162 b) 0.2107 (c) 0.4108 (d) 0.1078
Q. 18 A connecting rod of mass 3kg oscillates 50 times in one minute when suspended at a small end. Find its mass moment of inertia about the axis passing through its centre of gravity which is located at 300mm from small end. (a) 0.012 (b) 0.023 (c) 0.042 (d) 0.052
Q.19 A connecting rod of mass 3.5kg is suspended by two wires each of 2m length. The wires are attached to the rod at points 150mm on either side of the centre of gravity. If the connecting rod makes 35 oscillations in 60 seconds. Find the radius of gyration and the mass moment of inertia of the connecting rod about its centre of gravity. (a) 0.0287 (b) 0.0187 (c) 0.0365 (d) 0.0485
Q. 20 A rigid body can be replaced by two masses, connected rigidly together. The system of two masses will be dynamically equivalent to the rigid body if (a) the mass of the two system are the same (b) the centre of gravity of the two mass system coincides with the centre of gravity of the rigid body (c) the total mass moment of inertia of the two mass system about an axis through the centre of gravity is equal to that of rigid body about the same axis (d) all of the above
Q.21 A rigid body , under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if (a) the sum of two masses is equal to the total mass of the body (b) the centre of gravity of the two masses coincide with that of the body (c) the sum of mass moment of inertia of the masses about their centre of gravity is equal to the mass moment of inertia of the body (d) all of the above
Q.22 Any distributed mass can be replaced by two point masses to have the same dynamical properties if (a) the sum of the two masses is equal to the total mass (b) the combined centre of mass coincides with that of the mass (c) the moment of inertia of two masses about perpendicular axis through their combined centre of mass is equal to that of the rod. (d) all of the above.
Q.23 The rigid body is replaced by two concentrated masses rigidly connected together. The system will be kinematically equivalent of the body if (a) the mass of two masses is equal to the mass of rigid body (b) the centre of gravity of two mass system coincides with the centre of gravity of rigid body (c) the mass moment of inertia of the two mass system and the rigid body about centre of gravity are equal (d ) all of the above.
Q.24 Which one of the following conditions is satisfied for a system to be dynamically equivalent? (a) l1.l2=k2 (b)l1+l2=k2 (c) l1-l2=k2 (d) l1.l2=k2 Where l and l =distance of two masses from C.G of the body, and k= radius of gyration of the body.
Q. 25 Fig. 1 shows a rigid body of a mass m having radius of gyration K about its centre of gravity. It is to be replaced by in equivalent dynamical system of two masses placed at A and B. The mass at A should be (a) ? ? ? (?+?) (b) ? ? ? (?+?) (c) ? 2 (d) ? 3
Q. 26 Figure shows a rigid body of mass m having a radius of gyration K about its centre of gravity. It is to be replaced by in equivalent dynamical system of two masses placed at A and B. The mass at B should be (a) a*m/(a+b) (b) b*m/(a+b) (c) m/2 (d) m/3
Q. 27 Refer figure the mass of rigid body is m and radius of gyration is K. The kinetically equivalent system shows masses m1 and m2. The mass m1 should be _________. (a)m1= ml2/(l1+l2) (b)m1= ml1/(l1+l2) (c)m1= m(l1l2)/ l1+l2 (d) m1= (l2/l1+l2)m2
Q. 28 Refer figure the mass of rigid body is m and radius of gyration is K. The kinetically equivalent system shows masses m1 and m2. The mass m2 should be (a) m2= ml2/(l1+l2) (b) m2= ml1/(l1+l2) (c) m2= m(l1l2)/ l1+l2 (d) m1= (l2/l1+l2)m2
Q. 29 Two systems shall be dynamically equivalent when (a) the mass of two are same (b) example of two coincides (c) M.I. of two about an axis through example is equal (d) All of the above
Q. 30 The essential condition of placing the two masses, so that the system becomes dynamically equivalent is (a) L1.l2 = kG2 (b) L1.l2=kG (c) L1=kG (d) L2=kG Where l1andl2= distance of two masses from the centre of gravity of the body, kG= radius of gyration of the body
Q. 31 For a link to be dynamically equivalent which condition needs to be satisfied? (a)K2=l1/l2 (b)K2=l2/l1 (c)K2=l1/l2 (d)K2=l1+l2
Q. 32 In a dynamically equivalent system, a uniformly distributed mass is divided into _________ point masses. (a) Two (b) Three (c) Four (d) Five
Q. 33 If m is the mass of connecting rod , k is the radius of gyration of connecting rod, k1 is the new radius of gyration of connecting rod, and is the angular acceleration of connecting rod than correction couple is given by __________. (a) TC=m[k2-k12] (b) TC=m[k12-k2] (c) TC=m[k12k2] (d) TC=m/ [k12-k2]
Q.34 Crank effort is the net force applied at the crankpin ___________ to the crank which gives the required turning moment on the crankshaft. Parallel Perpendicular At 450 1350
Q.35 In a reciprocating horizontal engiene the inertia force due to reciprocating mass helps the piston effort at _________ (a) ? =450 (b) ? =1200 (c) ? =300 (d) ? =1800
Q.36 State which of the following statement is true ? (a) The inertia force is equal in magnitude and opposite in direction to accelerating force (b) The magnitude of inertia force is give by the expression F1= mr ^2r (cos + cos2 /(2 n)) Where Symbols have their meaning (c) D-Alembert s principle is used to reduce a dynamic problem into an equivalent static problem (d) All are true statements
Q.37 In horizontal engine piston effort is given by ________. (a) Fp=Fg ?1-?? (b)Fp=Fg+?? ?? (c) Fp=??+ Fg ?1 (d) Fp=Fg ?1+ ??
Q.38 If ??is the piston effort and is the obliquity angle of connecting rod the piston side thus ??is __________. (a) ??tan (b) ??sin (c) ??cos (d) ??cot
Q.39 If ??is the piston effort and is the obliquity angle of connecting rod the piston side thus ??is __________. ?? ??? ?? ??? ?? ??? (a) (b) (c) (d) ??cos
Q.39 If ??is the piston effort and is the obliquity angle of connecting rod the piston side thus ??is __________. ?? (a) ??? ?? ??? ?? ??? (b) (c) (d) ??cos
Q.40 If FQ is the force acting on connecting rod, is the obliquity angle of connecting rod and Q is the angle made by crank, the radial force acting along the crank shaft FR is _________ (a) FQ sin ( + ) (b) FQ sin ( - ) (c) FQ cos ( + ) (d) FQ cos ( + )
Q.42 The turning moment of crank shaft is _________. (a) ? ?? (b)?? ? (c)FT * r (d)FT ?
Q. 43 If P is the piston effort and is the obliquity angle of connecting rod, the expression for thrust in connecting rod is _________ ? (a) ??? (b)P cos (c) P tan ? (d) ???
Q. 44 If piston effort of 100kN is acting and crank is made 45 from TDC and obliquity ratio is 2, then the thrust in connecting rod is _________. (a) 110 kN (b) 106.9kN (c) 95.2kN (d) 109.70
Q.45 If the piston effort of 100kN is acting and crank is made 45 from TDC and obliquity ratio is two then the piston side thrust is _________. (a) 38.40 (b) 35.40 (c) 36.58 (d) 37.78
Q.46 If piston effort of 100kN is acting and crank is made 45 from TDC and obliquity ratio is 2, then tangential force acting on crank shaft is ___________. (a) 95.42 (b) 97.42 (c) 93.42 (d) 92.38
Q. 47 If piston effort of 100kN is acting and crank is made 45 from TDC and obliquity ratio is 2, then radial force or load on main bearing is ____________. (a) 44.99 (b) 42.99 (c) 43.99 (d) 41.99
Q. 48 The tangential force acting on engine is 100kN and radius of crank is 500mm, the torque acting on crank is __________. (a) 60kN.m (b) 50kN.m (c) 45kN.m (d) 55kN.m
Q. 49 According to the law of dryness friction, the force of friction ___________. (a) Is independent of area of contact. (b) Is directly proportional to the normal pressure between the surface of contact. (c) Is independent of velocity of sliding. (d) Is dependent on material of bodies in contact. (e) All of the above.
