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
(C) all the belts
(D) there is no need of changing any one as remaining belts can take care of transmission of load
(D) all the weak belts
Crowning on pulleys helps__________________?
(A) in increasing velocity ratio
(B) in decreasing the slip of the belt
(C) for automatic adjustment of belt posi-tion so that belt runs centrally
(D) increase belt and pulley life
(D) none of the above
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
(D) none of the above
A point on a link connecting double slider crank chain traces a____________________?
(A) straight line
(B) circle
(C) parabola
(D) hyperbola
(D) ellipse
Typewriter constitutes__________________?
(A) machine
(B) structure
(C) mechanism
(D) inversion
(D) none of the above
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%
(D) Machines are run by electric motors, but structures are not
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
(D) crown gear
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
(D) D1+D2
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
(D) none of the above
For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimidstroke respectively, is__________________?
(A) maximum and zero
(B) zero and maximum
(C) minimum and maximum
(D) zero and minimum
(D) maximum and minimum