19-10-2016, 11:50 AM
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1. Which of the following is a lower pair
(a) ball and socket i
(b) piston and cylinder
© cam and follower
(d) (a) and (b) above
(e) belt drive.
2. If two moving elements have surface contact in motion, such pair is known as
(a) sliding pair
(b) rolling pair
© surface pair
(d) lower pair
(e) higher pair.
3. The example of lower pair is
(a) shaft revolving in a bearing
(b) straight line motion mechanisms
© automobile steering gear
(d) all of the above
(e) none of the above.
4. Any point on a link connecting double slider crank chain will trace a
(a) straight line
(b) circle
© ellipse
(d) parabola
(e) hyperbola.
5. A universal joint is an example of
(a) higher pair
(b) lower pair
© rolling pair
(d) sliding pair
(e) turning pair.
6. Pitch point on a cam is
(a) any point on pitch curve
(b) the point on cam pitch curve having the maximum pressure angle
© any point on pitch circle
(d) the point on cam pitch curve having the minimum pressure angle
(e) none of the above.
7. Cross head and guides form a
(a) lower pair
(b) higher pair
© turning pair
(d) rolling pair
(e) sliding pair.
8. A circular bar moving in a round hole is an example of
(a) incompletely constrained motion
(b) partially constrained motion
© completely constrained motion
(d) successfully constrained motion
(e) none of the above
9. If there are L number of links in a mechanism then number of possible inversions is equal to
(a) L + 1
(b) L - 1
© L
(d) L + 2
(e) L - 2.
10. Kinematic pairs are those which have two elements that
(a) have line contact
(b) have surface contact
© permit relative motion
(d) are held together
(e) have dynamic forces.
11. Automobile steering gear is an example of
(a) higher pair
(b) sliding pair
© turning pair
(d) rotary pair
(e) lower pair.
12. In higher pair, the relative motion is
(a) purely turning
(b) purely sliding
© purely rotary
(d) purely surface contact
(e) combination of sliding and turning.
13. Which of the following mechanism is obtained from lower pair
(a) gyroscope
(b) pantograph
© valve and valve gears
(d) generated straight line motions
(e) all of the above.
14. Which of the following would constitute a link
(a) piston, piston rings and gudgeon pin
(b) piston, piston rodand cross head
© piston, piston-rod
(d) piston, crank pin and crank shaft
(e) piston rod and cross head
15. The Scott-Russell mechanism consists of
(a) sliding and turning pairs
(b) sliding and rotary pairs
© turning and rotary pairs
(d) sliding pairs only
(e) turning pairs only.
16. Davis steering gear consists of
(a) sliding pairs
(b) turning pairs
© rolling pairs
(d) higher pairs
(e) lower pairs.
17. A completely constrained motion can be transmitted with .
(a) 1 link with pin joints
(b) 2 links with pin joints
© 3 links with pin joints
(d) 4 links with pin joints
(e) all of the above.
18. Oldham's coupling is the
(a) second inversion of double slider crank chain
(b) third inversion of double slider crank chain
© second inversion of single slider crank chain
(d) third inversion of slider crank chain
(e) fourth inversion of double slider crank chain.
19. Sense of tangential acceleration of a link
(a) is same as that of velocity
(b) is opposite to that of velocity
© could be either same or opposite to velocity
(d) is perpendicular to that of velocity
(e) none of the above.
20. A mechanism is an assemblage of
(a) two links
(b) three links
© four links or more than four links
(d) all of the above
(e) none of the above.
21. Elements of pairs held together mechanically is known as
(a) closed pair
(b) open pair
© mechanical pair
(d) rolling pair
(e) none of the above.
22. The advantage of the piston valve over D-slide valve is that in the former case
(a) wear is less
(b) power absorbed is less
© both wear and power absorbed are low
(d) the pressure developed being high provides tight sealing
(e) there is overall economy of initial cost, maintenance and operation.
23. use of flexible coupling is to
(a) it is easy to disassemble
(b) it is easy to engage and disengage
© it transmits shocks gradually
(d) it prevents shock transmission and eliminates stress reversals
(e) it increases shaft life.
24. The Klein's method of construction for reciprocating engine mechanism
(a) is based on acceleration diagram
(b) is a simplified form of instantaneous center method
© utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine
(d) enables determination of Corioli's component
(e) none of the above.
25. It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by
(a) universal joint
(b) knuckle joint
© Oldham's coupling
(d) flexible coupling
(e) electromagnetic coupling.
26. The example of a link in any mechanism would experience
(a) no acceleration
(b) linear acceleration
© angular acceleration
(d) both angular and linear accelerations
(e) none of the above.
27. In automobiles the power is transmitted from gear box to differential through
(a) bevel gear
(b) universal joint
© Hooke's joint
(d) Knuckle joint
(e) Oldham's coupling.
28. The indicator using Watt mechanism is known as
(a) Thompson indicator
(b) Richard indicator
© Simplex indicator
(d) Thomson indicator
(e) none of the above.
29. When a ship travels in a sea, which of the effect is more dangerous
(a) steering
(b) pitching
© rolling
(d) all of the above
(e) none of the above.
30. In an ideal machine, the output as compared to input is
(a) less
(b) more
© equal
(d) may be less or more depending on efficiency
(e) always less.
31. In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed
(a) Hartung governor
(b) Wilson Hartnell governor
© Pickering governor
(d) Inertia governor
(e) none of the above.
32. For fluctuating loads, welsuited bearing is
(a) ball bearing
(b) roller bearing
© needle roller bearing
(d) thrust bearing
(e) sleeve bearing
33. Crowning on pulleys helps
(a) in increasing velocity ratio
(b) in decreasing the slip of the belt
©increase belt and pulley life
(d) for automatic adjustment of belt posi-tion so that belt runs centrally
(e) none of the above.
34. Idler pulley is used
(a) for changing the direction of motion of the belt
(b) for applying tension
© for increasing -velocity ratio
(d) all of the above
(e) none of the above.
35. In multi-V-belt transmission, if one of the belt is broken, we have to change the
(a) broken belt
(b) broken belt and its adjacent belts
© all the weak belts.
(d) there is no need of changing any one as remaining belts can take care of transmission of load
(e) all the belts
36. Creep in belt drive is due to
(a) material of the pulley
(b) material of the belt
© larger size of the driver pulley
(d) uneven extensions and contractions due to varying tension
(e) expansion of belt.
37. To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use
(a) spur gear
(b) spiral gear
© bevel gear
(d) worm gear
(e) crown gear.
38. To obviate axial thrust, following gear drive is used
(a) double helical gears having opposite teeth
(b) double helical gears having identical teeth
© single helical gear in which one of the teeth of helix angle a is more
(d) mutter gears
(e) none of the above
39. Higher pairs are those which have
(a) point or line contact between the two elements when in motion
(b) surface contact between the two ele-ments when in motion
© elements of pairs not held together mechanically
(d) two elements that permit relative motion
(e) none of the above.
40. Peaucellier mechanism has
(a) eight links
(b) six links
© four links
(d) twelve links
(e) five links.