1. In Whitworth quick return motion mechanism, the driving crank is under an accelerated motion
a) True
b) False
Explanation: In Whitworth quick return motion mechanism, the driving crank rotates at a uniform speed and is widely used in shaping and slotting machines.
2. Which of the following mechanism is used to convert reciprocating motion into rotary motion?
a) Whitworth quick return motion mechanism
b) Oscillating cylinder engine
c) Crank and slotted lever quick return motion mechanism
d) Gnome engine
Explanation: Oscillating cylinder engine is used to convert reciprocating motion into rotary motion, the piston reciprocates and the cylinder oscillates about the pin.
3. How many cylinders are there in Gnome engine?
a) 4
b) 5
c) 6
d) 7
Explanation: Rotary internal combustion engines were used in aviation. Now-a-days gas turbines are used in its place. It consists of seven cylinders in one plane and all revolves about fixed centre.
4. Which of the following instruments is used to draw ellipses?
a) Elliptical trammels
b) Slotted lever and crank
c) Gnome engine
d) Oldham’s coupling
Explanation: Elliptical trammel is an instrument which is an inversion of a double slider crank chain. It is mainly used to draw ellipses.
5. Elliptical trammels are used to convert reciprocating motion into rotary motion.
a) True
b) False
Explanation: Elliptical trammels are used to draw ellipses; scotch yoke mechanisms are used to convert rotary motion into reciprocating motion.
6. How inversion is obtained in an elliptical trammel?
a) Fixing the slotted plate
b) Fixing the sliders
c) Fixing the turning pairs
d) Fixing the pin
Explanation: An elliptical trammel is an instrument which is an inversion of a double slider crank chain, here the inversion is obtained by fixing the slotted plate. It is used to draw ellipses.
7. Which of the mechanism is used to convert rotary motion into a reciprocating motion?
a) Elliptical trammel
b) Scotch yoke mechanism
c) Oldham’s coupling
d) Gnome engine
Explanation: Scotch yoke mechanism is an example of an inversion of a double slider crank chain, this mechanism is used to convert rotary motion into reciprocating motion.
8. In Scotch yoke mechanism, the crank is fixed in order to obtain the inversion.
a) True
b) False
Explanation: In scotch yoke mechanism there are in total 4 links, one is Crank and one is frame. Inversion can be obtained by fixing either of the remaining two links.
9. Which of the following mechanism is used for connecting two parallel shafts whose axes are at a small distance apart?
a) Elliptical trammel
b) Scotch yoke mechanism
c) Oldham’s coupling
d) Gnome engine
Explanation: Oldham’s coupling is an instrument which is an inversion of double slider crank chain, this is used to connect two parallel shafts whose axes are at a small distance apart.
10. Which of the following link is fixed to obtain inversion in Oldham’s coupling?
a) Driving shaft
b) Flange
c) Supporting frame
d) Driven shaft
Explanation: The shafts are coupled in such a way that if one shaft rotates, the other shaft also rotates at the same speed. This inversion is obtained by fixing the link which corresponds to Supporting frame.