721. The purpose of a thermostat in an engine cooling system is to
A. prevent the coolant from boiling
B. allow the engine to warm up quickly
C. indicate the coolant temperature
D. pressurise the system to raise the boiling point

722. The basic characteristics of a brake fluid is
A. a high boiling point
B. low viscosity
C. compatibility with rubber and metal parts
D. all of these

723. The petrol engine works on
A. Otto cycle
B. Carnot cycle
C. Diesel cycle
D. Rankine cycle

724. The gradient resistance to a vehicle having a mass of 980 kg moving on an incline of 10° is
A. 1.6694 N
B. 16.694 N
C. 166.94 N
D. 1669.4 N

725. The reconditioning process used to give cylinder bore surfaces a cross-hatch pattern, is known as
A. honing
B. porous plating
C. boring
D. shot peening

726. The function of a radiator fan in the cooling system is that
A. it blows air through the radiator when necessary
B. it is turned by wind force as the vehicle moves forward, and its rotation drives the water pump
C. it cools the engine by blowing air onto the cylinder block
D. it draws heat out of the engine compartment

727. The main function of an exhaust muffler is the
A. optimisation of exhaust efficiency
B. reduction of exhaust noise
C. reduction of nitrogen oxide in the exhaust gases
D. reduction of the exhaust gas volume

728. The characteristic that is enhanced by the honing of cylinder sleeves inner surface is
A. cooling efficiency
B. resistance to wear
C. lubrication performance
D. none of these

729. Instead of valves, the ports are used in case of
A. four stroke I.C. engines
B. two-stroke I.C. engines
C. V-6 engines
D. none of these

730. The starting system includes
A. a battery, a starter, and an ignition switch
B. a battery, a distributor, and an ignition switch
C. a battery, a starter, and a distributor
D. a distributor, a starter, and an ignition switch

NOTE
IF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.
PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
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