Questions set 62

IC Engine Crankshaft and Camshaft

1.      In a four stroke cycle engine camshaft revolves at ______ the crank speed.
a) Two times
b) Half
c) Four times
d) Three times
Answer: b
Explanation: The camshaft rotates at half of the crank speed.

2.      The gears on camshaft and crankshaft are known as
a) Lining gears
b) Aligning gears
c) Timing gears
d) Tuning gears
Answer: c
Explanation: These gears are called timing gears.

3.      The material known as high carbon high copper chrome silicon cast steel is used for making
a) Camshaft
b) Cylinder body
c) Cylinder head
d) Piston
Answer: a
Explanation: Material used for making camshafts is high carbon high copper chrome silicon cast steel.

4.      Camshaft gear is made from which material
a) Cast iron
b) Mild steel
c) Bakelite
d) Brass
Answer: c
Explanation: Camshaft gears are made from bakelite.

5.      Crankshafts are usually constructed by
a) Casting
b) Drop forging
c) Drawing
d) Extrusion
Answer: b
Explanation: Drop forging is used for making crankshafts.

6.      The main reasons for crankshaft wear are
a) Different loads at some points of rotation
b) Centrifugal forces due to crankshaft rotation
c) Misalignment in connecting rod
d) All of the mentioned
Answer: d
Explanation: All the three are the reasons for crankshaft wear.

7.      The main causes of crankshaft vibration are
a) Variation in torque
b) Cyclic variation of gas and combustion products
c) Unbalanced weight of parts
d) All of the mentioned
Answer: d
Explanation: Crankshaft vibration is caused by all the above mentioned causes.

8.      In the cam, the distance between the base circle and the nose is called
a) Lift
b) Lobe
c) Flank
d) Pitch
Answer: a
Explanation: Distance between the base circle and nose is called lift of cam.

9.      The crankshaft rotates the camshaft using
a) Belt drive
b) Chain drive
c) Gear drive
d) Motor drive
Answer: b
Explanation: Chain drive is used to connect crankshaft and camshaft.

10.  The crankshaft should be inspected for
a) Cracks
b) Alignment of crankpins and journals
c) Cleanliness of oil gallaries
d) All of the mentioned
Answer: d
Explanation: Crankshaft should be inspected for all the above mentioned faults.