Related Questions
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4
The Whitworth quick return motion mechanism is formed in a slider crank chain when the
B. Longest link is a fixed link
C. Slider is a fixed link
D. Smallest link is a fixed link
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4
A system in dynamic balance implies that
A. The system is critically damped
B. There is no critical speed in the system
C. The system is also statically balanced
D. There will absolutely no wear of bearings
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4
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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4
To obviate axial thrust, following gear drive is used
A. Double helical gears having opposite teeth
B. Double helical gears having identical teeth
C. Single helical gear in which one of the teeth of helix angle a is more
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4
The absolute acceleration of any point P in a link about center of rotation O is
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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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The motion between a pair which takes place in __________ is known as incompletely constrained motion.
C. More than one direction
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A slider crank chain consists of following numbers of turning and sliding pairs
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The lower pair is a
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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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Which of the following is a higher pair?
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The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is
A. (1/2). μ W cosecα (r₁ + r₂)
B. (2/3). μ W cosecα (r₁ + r₂)
C. (1/2). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)]
D. (2/3). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)]
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4
The maximum fluctuation of energy is the
A. Difference between the maximum and minimum energies
B. Sum of the maximum and minimum energies
C. Variations of energy above and below the mean resisting torque line
D. Ratio of the mean resisting torque to the workdone per cycle
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4
Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is
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4
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a
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4
Tangential acceleration direction is
A. Along the angular velocity
B. Opposite to angular velocity
C. May be any one of these
D. Perpendicular to angular velocity
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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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4
Which of the following is a lower pair?
D. Both (A) and (B) above
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4
The height of a Watt's governor is
A. Directly proportional to speed
B. Directly proportional to (speed)²
C. Inversely proportional to speed
D. Inversely proportional to (speed)²
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4
The unbalanced primary forces in a reciprocating engine are
C. Balanced by secondary forces
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4
Idler pulley is used
A. For changing the direction of motion of the belt
C. For increasing velocity ratio
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4
In a multiple V-belt drive, if one of the belts is broken, then we should replace
C. The broken belt and the belts on either side of it
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4
The gear train usually employed in clocks is a
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The ratio of height of Porter governor (when length of arms and links are equal) to the height of Watt's governor is (where m = Mass of the ball, and M = Mass on the sleeve)
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4
Power of a governor is the
A. Mean force exerted at the sleeve for a given percentage change of speed
B. Workdone at the sleeve for maximum equilibrium speed
C. Mean force exerted at the sleeve for maximum equilibrium speed
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4
For low and moderate speed engines, the cam follower should move with
B. Simple harmonic motion
C. Uniform acceleration and retardation
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4
The D-slide valve is also known as
A. Inside admission valve
B. Outside admission valve
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A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is
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4
When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a
C. Meyer's expansion valve
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Throw of a cam is the maximum distance of the follower from