In SI engines, to obtain required firing order
A. 1 only
B. 2 only
C. 1 and 3 only
D. 1, 3 and 4 only
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Which of the following is not the main part of a spark plug?
A. The center electrode
B. The ground electrode
C. Distributor cap
D. The insulator
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A lead acid battery consists of a number of cells connected together in series and each having a nominal potential of 2 volts when fully charged.
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Which of the following is not a factor affecting the ignition advancement?
A. Nature of fuel
B. Engine speed
C. Entropy
D. Load
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To develop high voltage for spark plug of petrol engine.
A. Distributor is installed
B. Carburettor is installed
C. Battery is installed
D. Ignition coil is installed
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The primary voltage increases as the engine speed increases due to the limitations in the current switching capability of the breaker system.
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The process of igniting fuel by heat of compression is called?
A. Cooling ignition method
B. Compression ignition method
C. Compression initial method
D. Specific gravity method
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Which of the following firing order is commonly used for the four-cylinder vertical engine?
A. 1-2-3-4
B. 3-4-1-2
C. 4-3-2-1
D. 1-3-4-2
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Which among the following is not a requirement of a good contact breaker?
A. Must open and close at the correct time
B. Contacts must close without bounce
C. Minimum corrosion
D. Contacts should open with fling
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On which condition does the vacuum advance mechanism shift the ignition point?
A. Under part-load operation
B. Under full load operation
C. Under no-load operation
D. Under sudden acceleration
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The ignition system can be turned ON or OFF, with the help of an ignition switch.
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What is the function of the sealing between the insulator and the body shell?
A. Prevents the hot gas from leaking
B. Prevents the pressure increase
C. Prevents the temperature increase
D. Prevents Current leakage
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Which among the following is provided in a vacuum advance type to keep the advance unit at zero if no vacuum is applied as during idling?
A. Carburetor
B. Diaphragm
C. Centrifugal weights
D. Return spring
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The optimum spark timing must be retarded for the engine operating with a rich mixture.
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An ignition system should provide a good spark between the . . . . . . . . of the plugs at the correct timing.
A. Cathodes
B. Anodes
C. Electrodes
D. None of the mentioned
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The battery is charged by a . . . . . . . . driven by the engine.
A. Shaft
B. Axle
C. Dynamo
D. None of the mentioned
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Which of the following is the disadvantage of the magneto ignition system?
A. Magneto ignition system has a poor quality of spark during starting
B. Magneto ignition system occupies more space
C. Magneto ignition system has more maintenance problems
D. Magneto ignition system is used largely in four wheels
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What percent of battery loss in 24 hours is known as battery leakage?
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Insulating material generally used in spark plug is
A. Wood
B. Bakelite
C. Polymer
D. Porcelain
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What should be the gap of spark plug?
A. 1.2 - 1.53 mm
B. 2.5 - 2.85 mm
C. 0.5 - 0.85 mm
D. 3.15 - 3.45 mm
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