# Automotive Engine Components Design Questions and Answers – IC Engine – Design of Centre Crankshaft

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This set of Automotive Engine Components Design Multiple Choice Questions & Answers (MCQs) focuses on “ IC Engine – Design of Centre Crankshaft”.

1. Which are the two forces experienced by the center crankshaft?
a) Tensile and compressive
b) Tensile and Bending
c) Compressive and torsional
d) Bending and torsional

Explanation: The Crankshaft is subjected to the bending and torsional moments due to force by crankpin, the weight of flywheel and belt tension.

2. Force is exerted by connecting rod on which portion of the crankshaft?
a) Gudgeon pin
b) Spigot
c) Crankpin
d) Pin

Explanation: Force is exerted by the connecting rod on the crankpin and this force obtained by the piston. Crankpin connects both the connecting rod and the crankshaft.

3. Weight of flywheel force, always act on which direction?
a) Horizontally leftward
b) Horizontally rightward
c) Vertically downward
d) Vertically upward

Explanation: Weight of flywheel(W) acts downward in the vertical Direction and resultant belt tension acts in the horizontal direction (P1 + P2). Flywheel balances the rotating crankshaft.
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4. Resultant belt tension from the flywheel acts in which direction?
a) Horizontal
b) Right side
c) Forward
d) Vertical

Explanation: Weight of flywheel(W) acts downward in the vertical Direction and resultant belt tension acts in the horizontal direction (P1 + P2). V-belts are used very often in automobiles.

5. At what position, crankshaft experience maximum bending moment?
c) Middle position

Explanation: The crank is at the top dead center position and subjected to maximum bending moment and no torsional moment. At this position Piston, the connecting rod forms a straight axis. So bending takes place.

6. What is the value of the torsional moment when the crankshaft is at the top dead center?
a) Bending moment
b) Torsional moment
c) No torsional moment
d) Stress

Explanation: The crank is at the top dead center position and subjected to maximum bending moment and no torsional moment. Torsional moment is a twisting force.

7. When does crankshaft experience a maximum torsional moment?
a) At angled position
b) At zero degree
c) At 180 degree
d) At 360 degree

Explanation: The crank is at an angle with the line of dead center positions and subjected to maximum torsional moment. Angled position is when the piston is in the middle of the cylinder.

8. The crankshaft is manufactured using which process?
a) Drop casting
b) Split casting
c) Casting
d) Drop forging process

Explanation: The crankshaft is subjected to fluctuating stresses and it should have sufficient endurance limit stress. Parts manufactured with Forging can withstand high stresses

9. Which material is used for crankshaft?
a) Carbon steel
b) Carbon fiber
c) Plain carbon steel
d) Bulged carbon steel

Explanation: The popular materials used for crankshaft are plain carbon steels and alloy steels. The plain carbon steels include 40C8 and 50C4.This results in lightweight, and less wear and tear.

10. Which alloy steels are used for making crankshaft?
a) Bronze
b) Nickel-chromium steels
c) Chromoly
d) Plane steel

Explanation: The alloy steels used for making crankshaft are nickel-chromium steels such as 16NiCr2, 35NiCr2, and 40Ni10Cr3Mo6. Hence, nickel-chromium steels are the right answer.

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