Related Questions
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4
A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)
C. P = W (sin α + μ cos α)
D. P = W (cos α + μ sin α)
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4
The cam follower generally used in automobile engines is
C. Spherical faced follower
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4
The flank of the tooth is the surface of the tooth __________ the pitch surface.
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4
A circular bar moving in a round hole is an example of
A. Incompletely constrained motion
B. Partially constrained motion
C. Completely constrained motion
D. Successfully constrained motion
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4
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The total acceleration of B with respect to A will be equal to
A. Vector sum of radial component and coriolis component
B. Vector sum of tangential component and coriolis component
C. Vector sum of radial component and tangential component
D. Vector difference of radial component and tangential component
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4
Which of the following is false statement in respect of differences between machine and structure?
A. Machines transmit mechanical work, whereas structures transmit forces
B. In machines, relative motion exists between its members, whereas same does not exist in case of structures
C. Machines modify movement and work, whereas structures modify forces
D. Efficiency of machines as well as structures is below 100%
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4
In the two rotor system as shown in the below figure (I₁ < I₂), a node of vibration is situated
A. Between I₁, and I₂ but nearer I₁
B. Between I₁, and I₂ but nearer to I₂
C. Exactly in the middle of the shaft
D. Nearer to I₁ but outside
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4
The periodic time is given by (where ω = Angular velocity of the particle in rad/s)
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4
The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is
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4
The ratio of the driving tensions for V-belts is __________ times that of flat belts. (Where β = Semi-angle of the groove)
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4
Which of the following would constitute a link?
A. Piston, piston rod and cross head
C. Piston rod and cross head
D. Piston, crank pin and crank shaft
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4
In a gear having involute teeth, the normal to the involute is a tangent to the
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The two parallel and coplanar shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as
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The factional torque for square thread at the mean radius r while raising load W is given by
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4
In a screw jack, the effort required to lower the load W is given by
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The radial distance of a tooth from the pitch circle to the bottom of the tooth is called
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A watt's governor can work satisfactorily at speeds from
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Angular acceleration of a link can be determined by dividing the
A. Centripetal component of acceleration with length of link
B. Tangential component of acceleration with length of link
C. Resultant acceleration with length of link
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4
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be
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4
Which of the following statement is wrong?
A. The difference between the maximum and minimum energies is called maximum fluctuation of energy
B. The coefficient of fluctuation of speed is the ratio of maximum fluctuation of speed to the mean speed
C. The variations of energy above and below the mean resisting torque line is known as fluctuation of energy
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4
In elliptical trammels
A. All four pairs are turning
B. Three pairs turning and one pair sliding
C. Two pairs turning and two pairs sliding
D. One pair turning and three pairs sliding
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4
A spring controlled governor is said to be isochronous 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. Remain constant for all radii of rotation
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4
When brakes are applied to all the four wheels of a moving car, the distance travelled by the car before it is brought to rest, will be
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4
Coriolis component acts
A. Perpendicular to sliding surfaces
B. Along sliding surfaces
C. Somewhere in between above two
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4
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)
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4
The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
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In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, if N coincides with O, then
A. Acceleration and velocity of the piston P is zero
B. Acceleration and velocity of the piston P is maximum
C. Acceleration of the piston P is zero and its velocity is maximum
D. Acceleration of the piston P is maximum and its velocity is zero
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4
A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by
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4
The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as
A. Completely constrained motion
B. Incompletely constrained motion
C. Successfully constrained motion
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4
Which gear is used for connecting two coplanar and intersecting shafts?