Related Questions
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The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)
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4
In a band and block brake, the ratio of tensions on tight side and slack side of the band is (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)
B. T₁/T₂ = [(1 - μ tanθ)/(1 + μ tanθ)]n
D. T₁/T₂ = [(1 + μ tanθ)/(1 - μ tanθ)]n
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4
Under logarithmic decrement, the amplitude of successive vibrations are
B. In arithmetic progression
C. In geometric progression
D. In logarithmic progression
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4
Inertia force acts
A. Perpendicular to the acceleration force
B. Along the direction of acceleration force
C. Opposite to the direction of acceleration force
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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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4
Ackermann steering gear consists of
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The secondary unbalanced force is __________ the primary unbalanced force.
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A spring controlled governor is said to be unstable 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. Remains constant for all radii of rotation
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4
In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)
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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
Which of the following is a spring controlled governor?
C. Wilson-Hartnell governor
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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
The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)
C. (1 - c).m.ω².r (cosθ - sinθ)
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4
The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is
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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
Which type of gear train is used in clock mechanism to join hour hand and minute hand?
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4
In order to facilitate starting of locomotive in any position, the cranks of a locomotive with two cylinders, are placed at
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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
When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.
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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
For the same lift and same angle of ascent, a smaller base circle will give
A. A small value of pressure angle
B. A large value of pressure angle
C. There is no such relation with pressure angle
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4
In higher pair, the relative motion is
D. Combination of sliding and turning
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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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The two elements of a pair are said to form a _________ when they permit relative motion between them.
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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
In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, this method will
A. Cause withdrawing or throttling of steam
B. Reduce length of effective stroke of piston
C. Reduce maximum opening of port to steam
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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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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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If the opposite links of a four bar linkage are equal, the links will always form a
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The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.