1) Which type of variator is known as Svetozaro variator?
a. Cone variator with swiveling disc
b. Cone variator with spheres supported on shafts
c. Spheroid with spheres supported on shafts
d. Spheroid with swiveling disc
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2) Which belt is a combination of both toothed and belt transmissions used as an intermediate member in variators with axially displaceable cones?
a. Cogged belt
b. V belt
c. Both a. and b.
d. None of the above
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3) The chain used in positively infinitely variable drive provides
a. friction type drive
b. positive drive
c. Both a. and b.
d. None of the above
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4) Why is a dog clutch used?
a. Used to connect and disconnect machine parts
b. Used to control torque
c. It helps in rotating the shafts at different speeds
d. All of the above
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5) What are variators?
a. They are electrical stepped regulation devices
b. They are mechanical stepped regulation devices
c. They are mechanical stepless regulation devices
d. They are electrical stepless regulation devices
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Answer
Explanation
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ANSWER: They are mechanical stepless regulation devices
Explanation:
No explanation is available for this question!
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6) What is the effect of reactive gyroscopic couple when an aeroplane takes a right turn and propeller rotates in anticlockwise direction?
a. The nose and tail of the aeroplane are in horizontal plane
b. The nose of the aeroplane is raised and tail is dipped
c. The nose of the aeroplane is dipped and tail is raised
d. None of the above
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Answer
Explanation
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ANSWER: The nose of the aeroplane is dipped and tail is raised
Explanation:
No explanation is available for this question!
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7) What is the effect of reactive gyroscopic couple when aeroplane takes right turn and propeller rotates in clockwise direction?
a. The tail of the aeroplane is dipped and nose is raised
b. The tail of the aeroplane is raised and nose is dipped
c. Reactive gyroscopic couple has no effect when propeller rotates in clockwise direction
d. None of the above
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Answer
Explanation
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ANSWER: The tail of the aeroplane is raised and nose is dipped
Explanation:
No explanation is available for this question!
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8) Gyroscopic effect is not observed in which of the following actions performed by the ships?
a. Rolling
b. Pitching
c. Steering
d. All of the above
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9) Calculate reactive gyroscopic couple acting on rotating disc which is inclined at an angle of 1.5o. Mass moment of inertia about polar and diametral axis is 2.45 kg-m2 and 0.5 kg-m2 respectively. The disc rotates at an angular velocity of 130 rad/sec
a. 800.36 N-m
b. 862.36 N-m
c. 850.11 N-m
d. None of the above
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10) What is meant by pitching of ship?
a. up and down motion of bow and stern along transverse axis
b. up and down motion of bow and stern along longitudinal axis
c. up and down motion of port and starboard along transverse axis
d. none of the above
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Answer
Explanation
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ANSWER: up and down motion of bow and stern along transverse axis
Explanation:
No explanation is available for this question!
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11) Find out three precision points using 'Chebyshev Spacing Rule' for the interval 10 to 25
a. 30, 17.5, 23.96
b. 30, 30, 30
c. 11, 17.5, 23.96
d. None of the above
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12) Which among the following is/are classified under synthesis problem?
a. Path generation
b. Function generation
c. Body guidance
d. All of the above
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13) Which among the following is not a type of error found in function generation?
a. Structural error
b. Mechanical error
c. Graphical error
d. None of the above
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14) Why are graphical errors caused during function generation?
a. Choice of scale
b. Wrong graphical procedure
c. Both a. and b.
d. None of the above
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15) What is meant by order defect?
a. The precision points are not properly configured
b. The links of mechanism do not cover all precision points
c. Both a. and b.
d. None of the above
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Answer
Explanation
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ANSWER: The precision points are not properly configured
Explanation:
No explanation is available for this question!
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16) Calculate the limiting speed to avoid cam jump, if an eccentric plate circular cam has eccentricity of 30 mm and provides motion to the follower of 4 kg mass. Stiffness of the spring is 30 N/mm2. Preload in the spring is 600 N
a. 70.81 rad/sec
b. 60.76 rad/sec
c. 141.42 rad/sec
d. None of the above
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17) Which of the following equation is used to measure pressure angle between direction of follower motion and force exerted by the cam on follower when eccentricity is zero?
Where,
rb = base circle radius
y = displacement of follower
a. cot Φ = (dy /dθ) / ( rb + y)
b. tan Φ = (dy /dθ) / ( rb + y)
c. tan Φ = (dy /dθ) x ( rb + y)
d. cot Φ = (dy /dθ) x ( rb + y)
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18) Which of the following conditions can be used to minimize undercutting in cam and follower mechanism?
a. By using larger roller diameter
b. By using internal cams
c. By decreasing the size of the cam
d. All of the above
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19) Which of the following statements is false for SHM follower motion?
a. SHM can be used only for moderate speed purpose
b. The acceleration is zero at the beginning and the end of each stroke
c. The jerk is maximum at the mid of each stroke
d. Velocity of follower is maximum at the mid of each stroke
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Answer
Explanation
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ANSWER: The acceleration is zero at the beginning and the end of each stroke
Explanation:
No explanation is available for this question!
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20) Which motion of follower is best for high speed cams?
a. SHM follower motion
b. Uniform acceleration and retardation of follower motion
c. Cycloidal motion follower
d. All of the above
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21) If lead angle of worm is 13o and lead of worm is 40 mm. Find pitch circular diameter of worm
a. 53.22 mm
b. 55.15 mm
c. 27.67 mm
d. None of the above
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22) Determine axial force acting on bevel gears when tangential force of 2700 N acts on it.
Pitch cone angle = 12.36o & Pressure angle = 30o
a. 295.82 N
b. 333.67 N
c. 347.26 N
d. insufficient data
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23) Which of the following statements is/are true?
a. Lead angle of worm and spiral angle of worm wheel should be equal
b. Worm and worm gear have shaft angle of 90o
c. Helical gears have opposite hand of helix when two teeth mesh
d. All of the above
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24) Which type of gears have point contact between two mating gears?
a. Helical gears
b. Spiral gears
c. Both a. and b.
d. None of the above
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25) Maximum efficiency of spiral gears is given as
a. [cos ( θ + Φ) + 1] / [ cos ( θ – Φ) + 1]
b. [cos ( θ + Φ) – 1] / [ cos ( θ – Φ) – 1]
c. [sin ( θ + Φ) – 1] / [ cos ( θ – Φ) – 1]
d. [sin ( θ + Φ) – 1] / [ sin ( θ – Φ) – 1]
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