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°