65. low engine oil pressure may be due to
A. clogged oil filter
B. more oil filled in the oil sump
C. high viscosity of oil used
D. excessive backlash between pump gears
66. Dirty air will cause
A. engine noise
B. engine over heating
C. faster wear of engine parts
D. high oil consumption
67. The boiling temperature of the coolant in the cooling in the cooling system is increased by the use of
A. water jackets
B. vacuum valve only
C. pressure type radiator cap
D. radiator core tubes/pipes
68. The main purpose of pressure radiator cap is to
A. pressurize the system
B. increase air water circulation
C. help to develop vacuum in the system
D. avoid build up to pressure
69. one of the following causes may also contribute to overheating of an engine
A. clogged radiator cores
B. low idle speed setting
C. excessive valve tappet clearance
D. lubricating oil pressure is too high
70. Engine develops less power due to
A. defective ignition timing
B. excessive rich mixture
C. defective lubrication system
D. too tight cylinder head
71. The high fuel consumption of a petrol engine may be due to
A. leakage of fuel from carburetor
B. defects in lubrication system
C. air leaks in intake manifold
D. incorrect idle speed ( too low )
72. Engine does not start because of
A. absence of fuel filters
B. punctured float
C. low viscosity of engine oil
D. less water in radiator
