Related Questions
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The danger of breakage and vibration is maximum
A. Below the critical speed
B. Near the critical speed
C. Above the critical speed
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In a simple train of wheels, the velocity ratio __________ the intermediate wheels.
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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
The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is
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4
A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when
D. a is +ve and b is also +ve
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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)
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The minimum force required to slide a body of weight W on a rough horizontal plane is
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In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as
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Which type of gearing is used in steering system of an automobile?
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The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)
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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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The lower pair is a
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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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Which of the following is an open pair?
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If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be
A. Four times the first one
C. One fourth of the first one
D. One and a half times the first one
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The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is
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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
A shaft carrying three rotors will have
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4
Which gear train is used for higher velocity ratios in a small space?
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In under damped vibrating system, the amplitude of vibration
A. Decreases linearly with time
B. Increases linearly with time
C. Decreases exponentially with time
D. Increases exponentially with time
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In its simplest form, a cam mechanism consists of following number of links
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In a pantograph, all the pairs are
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If the opposite links of a four bar linkage are equal, the links will always form a
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In a single slider crank chain
A. Each of the four pairs is a turning pair
B. One is a turning pair and three are sliding pairs
C. Two are turning pairs and two are sliding pairs
D. Three are turning pairs and one is a sliding pair
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A shaft carrying two rotors at its ends will have
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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 the equation are __________ then the system will be under damped.
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One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring)
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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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In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links
C. Could change or remain unaltered depending on which link is fixed
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The purpose of a link is to