Q.1
Kinematic pairs are those which have
Q.2
If ω/ωn is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
Q.3
A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is
Q.4
The velocity of sliding of meshing gear teeth is
(Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point)
Q.5
A reed type tachometer use the principle of
Q.6
Sensitiveness of the governor is defined as the ratio of the
Q.7
In a spring controlled governor, when the controlling force ________ as the radius of rotation increases, it is said to be a stable governor.
Q.8
In order to double the period of a simple pendulum, the length of the string should be
Q.9
In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be
Q.10
In gears, interference takes place when
Q.11
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
Q.12
For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is
Q.13
Which of the below are inversions of slider crank mechanism?
1. Oscillating cylinder engine mechanism
2. Toggle mechanism
3. Radial cylinder engine mechanism
4. Quick return mechanism
Q.14
The unbalanced force due to revolving masses
Q.15
The relative velocity of B with respect to A in a rigid link AB is
Q.16
A shaft carrying three rotors will have
Q.17
If two moving elements have surface contact in motion, such pair is known as
Q.18
The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)
Q.19
The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)
Q.20
The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)
Q.21
The sensitiveness of the governor __________ as the speed range decreases.
Q.22
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be
Q.23
The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)
Q.24
The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)
Q.25
When the primary direct crank of a reciprocating engine makes an angle of 'θ' with the line of stroke, then the secondary direct crank will make an angle of _________ with the line of stroke.
Q.26
The lower pair is a
Q.27
The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)
Q.28
The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.
Q.29
The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.
Q.30
The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is
Q.31
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is
Q.32
The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to
Q.33
When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.
Q.34
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to
Q.35
Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is
Q.36
The working depth of a gear is the radial distance from the
Q.37
The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load)
Q.38
Module of a gear is
Q.39
In railway axle boxes, the bearing used is
Q.40
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to
Q.41
Whitworth quick return mechanism is obtained by inversion of
Q.42
The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)
Q.43
The dynamic friction is the friction experienced by a body, when the body
Q.44
The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)
Q.45
In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is
Q.46
The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.
Q.47
In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as
Q.48
The sense of Coriolis component 2 ωv is same as that of the relative velocity vector v rotated at
Q.49
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the
Q.50
In a ball bearing, ball and bearing forms a
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