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600+ Automobile Engineering MCQ page-15

Question 141:- The piston pins in the modern automobile engines are usually
(a) semi-floating
(b) fully-floating
(c) three-quarter floating
(d) fixed to both piston and the connecting rod end

Question 142:- The counterweights on a crankshaft are located opposite the
(a) main bearings
(b) big-end bearings
(c) small-end bearings
(d) vibration damper

Question 143:- On the front end of a crankshaft is mounted
(a) timing gear
(b) vibration damper
(c) fan pulley
(d) all of these

Question 144:- On the rear end of a crankshaft mounted
(a) flywheel
(b) counterweight|
(c) vibration damper
(d) timing sprocket

Question 145:- The ratio of main journal diameter and the cylinder bore in a ear engine is approximately
(a) 0.1
(b) 0.25
(c) 0.5
(d) 0.75

Question 146:- In a six-cylinder car engine the angle between the successive crank throw is
(a) 60
(b) 90
(c) 120
(d) 180

Question 147:- The vibration damper on a crankshaft reduces the
(a) longitudinal vibrations
(b) transverse vibrations
(c) torsional vibrations
(d) all of these

Question 148:- The number of main bearings in a 4-cylinder car engine is usually
(a) 2
(b) 3
(c) 4
(d) 6

Question 149:- The most commonly used valve in an automobile engine is
(a) poppet valve
(b) sleeve valve
(c) rotary valve
(d) none of these

Question 150:- Exhaust valve face angle is generally
(a) 30°
(b) 45°
(c) 60°
(d) 75°

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