Related Questions
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The natural frequency of free transverse vibrations due to a point load acting over a simply supported shaft is equal to (where δ = Static deflection of a simply supported shaft due to the point load)
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The number of links and instantaneous centers in a reciprocating engine mechanism are
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Oldhams coupling is an inversion of the kinematic chain used in
A. Whitworth quick return mechanism
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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
The maximum velocity of a particle moving with simple harmonic motion is
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A higher pair has__________.
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In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction.
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The effort of a Porter governor is equal to (where c = Percentage increase in speed, m = Mass of ball, and M = Mass on the sleeve)
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The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as
D. Coefficient of friction
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The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
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To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use?
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The contact ratio is given by
A. (Length of the path of approach)/(Circular pitch)
B. (Length of path of recess)/(Circular pitch)
C. (Length of the arc of contact)/(Circular pitch)
D. (Length of the arc of approach)/cosφ
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Which of the following statement is correct?
A. The power absorbed in operating the piston valve is less than D-slide valve
B. The wear of the piston valve is less than the wear of the D-slide valve
C. The D-slide valve is also called outside admission valve.
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Which of the following is a higher pair?
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Efficiency of a screw jack is given by
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The rotating shafts tend to vibrate violently at whirling speeds because
A. The system is unbalanced
B. Bearing centre line coincides with the axis
C. The shafts are rotating at very high speeds
D. Resonance is caused due to the heavy mass of the rotor
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The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)
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In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from
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The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)
B. ω (r₁ + r₂) sinθ sec2θ
D. ω (r₁ + r₂) cosθ cosec2θ
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The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r₁ and r₂ = External and internal radii of collar respectively)
C. (1/2). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
D. (2/3). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
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The product of the diametral pitch and circular pitch is equal to
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In a kinematic chain, a quaternary joint is equivalent to
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Klein's construction is useful to determine
A. Velocity of various parts
B. Acceleration of various parts
C. Displacement of various parts
D. Angular acceleration of various parts
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A spring controlled governor is said to be unstable when the controlling force
A. Increases as the radius of rotation decreases
B. Increases as the radius of rotation increases
C. Decreases as the radius of rotation increases
D. Remains constant for all radii of rotation
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There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is
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The direction of Coriolis component of acceleration is the direction
A. Of relative velocity vector for the two coincident points rotated by 90° in the direction of the angular velocity of the rotation of the link
B. Along the centripetal acceleration
C. Along tangential acceleration
D. Along perpendicular to angular velocity
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For a twin cylinder V-engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the below figure. The engine is a
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The inversion of a mechanism is
A. Changing of a higher pair to a lower pair
B. Turning its upside down
C. Obtained by fixing different links in a kinematic chain
D. Obtained by reversing the input and output motion
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The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as
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The power from the engine to the rear axle of an automobile is transmitted by means of