Related Questions
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4
Flexible coupling is used because
A. It is easy to disassemble
B. It is easy to engage and disengage
C. It transmits shocks gradually
D. It prevents shock transmission and eliminates stress reversals
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4
In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as
A. Critical damping ratio
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4
The lead screw of a lathe with nut forms a
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4
An automobile steering gear is an example of
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4
When a ship travels in a sea, which of the effect is more dangerous
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The static friction
A. Bears a constant ratio to the normal reaction between the two surfaces
B. Is independent of the area of contact, between the two surfaces
C. Always acts in a direction, opposite to that in which the body tends to move
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4
The following is the inversion of slider crank chain mechanism
A. Whitworth quick return mechanism
C. Oscillating cylinder engine
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A system of masses rotating in different parallel planes is in dynamic balance if the
A. Resultant force is equal to zero
B. Resultant couple is equal to zero
C. Resultant force and resultant couple are both equal to zero
D. Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
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The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.
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4
The number of links in pantograph mechanism is equal to
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When one of the links of a kinematic chain is fixed, the chain is known as a
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For an isochronous Hartnell governor (where r₁ and r₂ = Maximum and minimum radius of rotation of balls respectively, S₁ and S₂ = Maximum and minimum force exerted on the sleeve respectively, and M = Mass on the sleeve)
A. (m.g + S₁)/(m.g + S₂) = r₁/r₂
B. (m.g - S₁)/(m.g - S₂) = r₂/r₁
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4
The maximum value of the pressure angle in case of cam is kept as
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The pressure angle of a cam depends upon
A. Offset between centre lines of cam and follower
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When two links are connected by a pin joint, their instantaneous centre lies
A. On their point of contact
B. At the centre of curvature
C. At the centre of circle
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A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of
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4
Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts?
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4
The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is
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4
The ratio of maximum fluctuation of energy to the workdone per cycle is called
B. Maximum fluctuation of energy
C. Coefficient of fluctuation of energy
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4
The number of centers in a crank driven slider crank mechanism is
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In under damped vibrating system, if x₁ and x₂ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to
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The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m). (dx/dt) + (s/m). x = 0 If the roots of this equation are real, then the system will be
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4
The natural frequency of free longitudinal vibrations is equal to (where m = Mass of the body, s = Stiffness of the body, and δ = Static deflection of the body)
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In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.
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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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Consider the following mechanisms:
1. Oscillating cylinder engine mechanism
2. Toggle mechanism
3. Radial cylinder engine mechanism
4. Quick return mechanism Which of the above are inversions of slider crank mechanism?
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4
When there is a reduction in amplitude over every cycle of vibration, then the body is said to have
D. Under damped vibration
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The gear train usually employed in clocks is a
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The power transmitted by a belt is maximum when the maximum tension in the belt is _________ of centrifugal tension.
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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