# What are crank effort diagrams? - Theory of Machines - 1

Q.  What are crank effort diagrams?
- Published on 06 Aug 15

a. Turning moment diagram is drawn on cartesian co-ordinates
b. Turning moment diagram is drawn on polar co-ordinates
c. Turning moment (T) is plotted against crank angle θ for various crank positions
d. All of the above

ANSWER: Turning moment (T) is plotted against crank angle θ for various crank positions

#### Discussion

• Sravanthi   -Posted on 19 Oct 15
Crank effort diagrams

- Turning moment diagram or crank effort diagrams is plotted between turning moment against various crank positions.

- The turning moment diagram drawn on Cartesian co-ordinates is called as rectangular turning moment diagram. Turning moment is plotted on the ordinate and crank angle is plotted is on abscissa in rectangular turning moment diagrams.

- The turning moment diagram drawn on polar co-ordinates is called as polar turning moment diagrams. At various crank angles (θ), turning moment is plotted on the radial lines.

Utility of turning moment diagrams or crank effort diagrams is given below:

- They are used to determine flywheel size.

- Diameter of shaft can be determined.

- Work done during the cycle is determined.

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