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1) 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 e. none of the above
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2) If D1 and D2 be the diameters of driver and driven pulleys, then belt speed is proportional to__________________? a. D1/D2 b. D2/D1 c. D1-D2. d. D1 e. D1+D2
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3) To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use__________________? a. spur gear b. spiral gear c. bevel gear d. worm gear e. crown gear
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4) Which of the following is false statement in respect of differences between machine and structure___________________? a. Machines transmit mechanical work, whereas structures transmit forces b. In machines, relative motion exists be-tween its members, whereas same does hot exist in case of structures c. Machines modify movement and work, whereas structures modify forces d. Efficiency of machines as well as structures is below 100% e. Machines are run by electric motors, but structures are not
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5) Typewriter constitutes__________________? a. machine b. structure c. mechanism d. inversion e. none of the above
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6) A point on a link connecting double slider crank chain traces a____________________? a. straight line b. circle c. parabola d. hyperbola e. ellipse
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7) Kinematic 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 c. elements of pairs not held together mechanically d. two elements that permit relative mo-tion e. none of the above
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8) Lower pairs are those which have___________________? a. point or line contact between the two elements when in motion b. surface contact between the two elements when in motion c. elements of pairs not -held together mechanically d. two elements that permit relative motion e. none of the above
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9) A panto graph is a mechanism with___________________? a. lower pairs b. higher pairs c. rolling pairs d. turning pairs e. spherical pairs
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10) If the opposite links of a four bar linkage are equal, the links will always form a_________________? a. triangle b. rectangle c. parallelogram d. pentagon e. trapezoid
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11) The approximate straight line mechanism is a____________________? a. four bar linkage b. 6 bar linkage c. 8 bar linkage d. 3 bar linkage e. 5 bar linkage
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12) Peaucellier mechanism has__________________? a. eight links b. six links c. four links d. twelve links e. five links
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13) A chain comprises of 5 links having 5 joints. Is it kinematic chain ? a. yes b. no c. it is a marginal case d. data are insufficient to determine it e. unpredictable
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14) For a kinematic chain to be considered as mechanism___________________? a. two links should be fixed b. one link should be fixed c. none of the links should be fixed d. there is no such criterion e. none of the above
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15) A cam mechanism imparts following motion___________________? a. rotating b. oscillating c. reciprocating d. all of the above e. none of the above
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16) Whitworth quick return mechanism is obtained by inversion of___________________? a. slider crank mechanism b. kinematic chain c. five link mechanism d. roller cam mechanism e. none of the above
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17) Which of the following mechanisms produces mathematically an exact straight line motion____________________? a. Grasshopper mechanism b. Watt mechanism c. Peaucellier’s mechanism d. Tchabichiff mechanism e. Ackermann mechanism
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18) A kinematic chain requires at least________________________? a. 2 links and 3 turning pairs b. 3 links and 4 turning pairs c. 4 links and 4 turning pairs d. 5 links and 4 turning pairs e. none of the above
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19) The following is the inversion of slider crank chain mechanism______________________? a. Whitworth quick return mechanism b. hand pump c. oscillating cylinder engine d. all of the above e. none of the above
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20) A typewriter mechanism has 7 number of binary joints, six links and none of higher pairs. The mechanism is________________? a. kinematically sound b. not sound c. soundness would depend upon which link is kept fixed d. data is not sufficient to determine same e. none of the above
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