i need help with these questions!?

Nectila

2013-02-18 13:01:13 UTC

1.to prevent wear from valve burning,valves
a.may have hollow stems partially filled with metallic sodium
b.must make good contact with valve seats and run with minimal clearance
c.may be rotated as they open and close
d.all of these

2.periodic adjustment of valve train clearance is usually required on an engineusing
a.mechanical valve lifters
b.hydraulic valve lifters
c.hydraulic roller lifters
d.variable valve timing

3.between the cylinder head and engine block you would most likely find a(n)
a.oil seal
b.head gasket
c.pan gasket
d.timing cover

4.one cylinder two-stroke cycle gasoline engines
a.have camshafts
b.may require oil to be mixed into the gasoline
c.do not have a spark plug
d.receives one power stroke for every two turns of the crankshaft

5.most cars have a(n)
a.f-head engine
b.i-head engine
c.l-head engine
d.t-head engine

6.push rods are used with
a.an engine with a camshaft in the block
b.an engine with one camshaft in the head
c.an engine with two camshafts in the head
d.any engine that does not use rocker arms

7.regarding preignition and detonation,
a.detonation may be caused by excessively low compression
b.preignition may be caused by an overheated spark plug
c.detonation starts shortly before the spark plug is fired
d.neither will damage an engine

8.consider a modern engine design with a relatively high 9 to 1 compression ratio
which one of the following statements would most likely be false?
a.the cylinder volume with the piston a bottom dead center (BDC) is 9 times the volume
at top dead center (TDC).
b.at TDC the pistons are very close to the head,and may have indentations to keep them from
striking the valves
c.switching from high octane to low octane fuel may cure a detonation problem

9.a modern engine with a hemispherical combustion chamber design
a.has relatively large valves placed in two planes
b.has spark plugs positioned very close to the sides of the cylinders
c.has pistons with an inverted V top

10.the firing order of a V-8 engine
a.is dependent on the arrangement of the crankshaft throws
b.is the same for any V-8
c.is usually adjusted at each tune-up
d.is always set so one cylinder is fired n each 1/8th turn of the crankshaft