In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be
A. 45 mm
B. Slightly less than 45 mm
C. Slightly more than 45 mm
D. 95 mm
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The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft and I
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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 θ
A. m ω 2 r cos θ
B. cm ω 2 r sin θ
C. ( 1 − c ) m ω 2 r ( cos θ − sin θ )
D. m ω 2 r ( cos θ − sin θ )
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When the primary direct crank of a reciprocating engine makes an angle of θ
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The lower pair is a
A. Open pair
B. Closed pair
C. Sliding pair
D. Point contact pair
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The purpose of a link is to
A. Transmit motion
B. Guide other links
C. Act as a support
D. All of the above
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In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from
A. 50° - 60°
B. 60° - 70°
C. 70° - 80°
D. 80° - 90°
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In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from
A. 10° - 15°
B. 15° - 25°
C. 25° - 30°
D. 30° - 40°
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The angle of inclination of the plane, at which the body begins to move down the plane is called
A. Angle of friction
B. Angle of repose
C. Angle of projection
D. None of these
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The radial distance of a tooth from the pitch circle to the bottom of the tooth is called
A. Dedendum
B. Addendum
C. Clearance
D. Working depth
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Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?
A. D-slide valve
B. Governor
C. Flywheel
D. Meyer's expansion valve
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The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.
A. Greater than
B. Less than
C. Equal to
D. None of these
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In which of the following type of gear train the first gear and the last gear are co-axial.
A. Simple gear train
B. Compound gear train
C. Reverted gear train
D. None of the above
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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
D. Mutter gears
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A point on a connecting link (excluding end points) of a double slider crank mechanism traces a
A. Straight line path
B. Hyperbolic path
C. Parabolic path
D. Elliptical path
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The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because
A. Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
B. The Ackerman steering gear consists of turning pairs
C. The Ackerman steering gear is most economical
D. Both (A) and (B)
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Maximum fluctuation of energy in a flywheel is equal to [where I S = Coefficient of fluctuation of speed and ω 2 ω 1 + ω 2
A. I ω ( ω 1 − ω 2 )
B. I ω 2 C S
C. 2E C S
D. All of these
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The gear train usually employed in clocks is a
A. Simple gear train
B. Reverted gear train
C. Sun and planet gear
D. Differential gear
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The method of direct and reverse cranks is used in engines for
A. The control of speed fluctuations
B. Balancing of forces and couples
C. Kinematic analysis
D. Vibration analysis
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Rectilinear motion of piston is converted into rotary by
A. Cross head
B. Slider crank
C. Connecting rod
D. Gudgeon pin
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