Related Questions
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4
In railway axle boxes, the bearing used is
A. Deep groove ball bearing
B. Double row self aligning ball bearing
C. Double row spherical roller bearing
D. Cylindrical roller bearing
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4
Cam angle is defined as the angle
A. During which the follower returns to its initial position
B. Of rotation of the cam for a definite displacement of the follower
C. Through which, the cam rotates during the period in which the follower remains in the highest position
D. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
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4
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done
A. Because of difficulty in manufacturing cam profile
B. Because of loose contact of follower with cam surface
C. In order to have acceleration in beginning and retardation at the end of stroke within the finite limits
D. Because the uniform velocity motion is a partial parabolic motion
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4
In a reciprocating engine, usually __________ of the reciprocating masses are balanced.
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4
Which of the following statement is correct for gears?
A. The addendum is less than the dedendum
B. The pitch circle diameter is the product of module and number of teeth
C. The contact ratio means the number of pairs of teeth in contact
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4
Klein's construction can be used to determine acceleration of various parts when the crank is at
C. Right angles to the link of the stroke
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4
In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon
A. Total lift, total angle of lift, minimum radius of cam and cam speed
B. Radius of circular arc, cam speed, location of centre of circular arc and roller diameter
C. Mass of cam follower linkage, spring stiffness and cam speed
D. Total lift, centre of gravity of the cam and cam speed
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4
In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)
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4
The mechanism forms a structure, when the number of degrees of freedom (n) is equal to
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4
A body will begin to move down an inclined plane, if the angle of inclination of the plane is ________ the angle of friction.
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4
Which of the following statement is correct?
A. The primary unbalanced force is less than the secondary unbalanced force.
B. The primary unbalanced force is maximum twice in one revolution of the crank.
C. The unbalanced force due to reciprocating masses varies in magnitude and direction both.
D. The magnitude of swaying couple in locomotives is inversely proportional to the distance between the two cylinder centre lines
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4
Oldhams coupling is an inversion of the kinematic chain used in
A. Whitworth quick return mechanism
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4
A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to
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4
Relationship between the number of links (L) and number of pairs (P) is
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4
In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be
C. Unaffected of sensitivity
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4
The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.
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4
Bifilar suspension method is used to find the
A. Angular acceleration of the body
B. Moment of inertia of the body
C. Periodic time of the body
D. Frequency of vibration of the body
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4
For the brake to be self locking, the force P at C shown in the below figure, should
B. Act in upward direction
C. Act in downward direction
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4
The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap.
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4
A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?
A. All points of the disc have the same velocity
B. The centre of the disc has zero acceleration
C. The centre of the disc has centrifugal acceleration
D. The point on the disc making contact with the plane surface has zero acceleration
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4
A body in motion will be subjected to coriolis acceleration when that body is
A. In plane rotation with variable velocity
B. In plane translation with variable velocity
C. In plane motion which is a resultant of plane translation and rotation
D. Restrained to rotate while sliding over another body
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4
The lower pairs are __________ pairs.
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4
In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T₁ acts at A and smaller tension T₂ at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should
B. Act in upward direction
C. Act in downward direction
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4
In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is
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4
The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r₁ = Minimum radius of the cam, r₂ = Radius of the roller follower, and θ = Angle turned by the cam from the beginning of the follower displacement)
C. (r₁ - r₂) [(1 - cosθ)/cos θ]
D. (r₁ + r₂) [(1 - cosθ)/cos θ]
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4
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
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4
A kinematic chain requires at least
A. 2 links and 3 turning pairs
B. 3 links and 4 turning pairs
C. 4 links and 4 turning pairs
D. 5 links and 4 turning pairs
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4
The lower pair is a
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4
When the crank is at the inner dead centre, in a reciprocating steam engine, then the acceleration of the piston will be
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4
The height of a Watt's governor (in metres) is equal to (where N = Speed of the arm and ball about the spindle axis)