Related Questions
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4
The working depth of a gear is the radial distance from the
A. Pitch circle to the bottom of a tooth
B. Pitch circle to the top of a tooth
C. Top of a tooth to the bottom of a tooth
D. Addendum circle to the clearance circle
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4
Which of the following statement is correct for involute gears?
A. The interference is inherently absent.
B. The variation in centre distance of shafts increases radial force.
C. A convex flank is always in contact with concave flank.
D. The pressure angle is constant throughout the teeth engagement.
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4
The equation of motion for a single degree of freedom system with viscous damping is 4(dx²/dt²) + 9(dx/dt) + 16x. The damping ratio of the system is
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4
The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be
A. To raise the bow and stern
B. To lower the bow and stern
C. To raise the bow and lower the stern
D. To raise the stern and lower the bow
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4
The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.
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4
The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.
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4
The coriolis component of acceleration is taken into account for
A. Slider crank mechanism
B. Four bar chain mechanism
C. Quick return motion mechanism
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4
The example of successfully constrained motion is a
A. Motion of an I.C. engine valve
B. Motion of the shaft between a footstep bearing
C. Piston reciprocating inside an engine cylinder
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4
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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4
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The radial component of the acceleration of B with respect to A, is (where vBA = Linear velocity of B with respect to A)
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4
The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)
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4
A point on a link connecting double slider crank chain traces a
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4
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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4
Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of a cross belt drive. The length of the belt is
A. π (r₁ + r₂) + [(r₁ + r₂)²/x] + 2x
B. π (r₁ + r₂) + [(r₁ - r₂)²/x] + 2x
C. π (r₁ - r₂) + [(r₁ - r₂)²/x] + 2x
D. π (r₁ - r₂) + [(r₁ + r₂)²/x] + 2x
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4
The train value of a gear train is
A. Equal to velocity ratio of a gear train
B. Reciprocal of velocity ratio of a gear train
C. Always greater than unity
D. Always less than unity
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4
If the pressure angle is __________, a reciprocating follower will jam in its bearings.
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4
The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)
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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
Throw of a cam is the maximum distance of the follower from
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4
To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use?
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4
A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal forc
A. The reaction on me inner wheels increases and on the outer wheels decreases
B. The reaction on the outer wheels increases and on the inner wheels decreases
C. The reaction on the front wheels increases and on the rear wheels decreases
D. The reaction on the rear wheels increases and on the front wheels decreases
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4
The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be
A. To dip the nose and tail
B. To raise the nose and tail
C. To raise the nose and dip the tail
D. To dip the nose and raise the tail
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4
The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)
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4
In a four bar chain or quadric cycle 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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4
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
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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4
In multi V-belt transmission, if one of the belt is broken, we have to change the
B. Broken belt and its adjacent belts
D. There is no need of changing any one as remaining belts can take care of transmission of load
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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
The mechanism forms a structure, when the number of degrees of freedom (n) is equal to
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4
In a spring controlled governor, when the controlling force ________ as the radius of rotation increases, it is said to be a stable governor.