Spark plug gaps are required in the range of
A. 0.02 to 0.6 mm
B. 0.45 to 1.00 mm
C. 0.90 to 2.00 mm
D. 1.00 to 1.30 mm
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What is the dwell time?
A. It is the time for which the contact breaker points remain closed
B. It is the time for which the contact breaker points remain open
C. The time during which inlet and exhaust valves open
D. The time during which inlet and exhaust valves close
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Preignition can be caused due to presence of . . . . . . . .
A. Excess lubricants in cylinder
B. Gum in fuel
C. Over-heated spark plug
D. Higher volume of air in air fuel mixture
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A signal generator in transistorized ignition system consist of
A. Ignition coil, permanent magnet and electronic control unit
B. A signal rotor, permanent magnet and electronic control unit
C. A signal rotor, a pick up coil and electronic control unit
D. A signal rotor, a pick up coil and a permanent magnet
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The voltage required to produce a spark between the spark points in spark plug is in the range
A. 2 to 4 kV
B. 5 to 5.5 kV
C. 6 to 10 kV
D. 12 to 15 kV
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The contact breaker points are generally made of
A. Plastic
B. Steel
C. Copper
D. Tungsten
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How is the frequency of firing in a two-stroke concerning the value of four-stroke engines?
A. Same as the value of four-stroke
B. Twice the value of four-stroke
C. Has no relationship with four-stroke
D. Four times the value of four-stroke
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Part load operation of a spark ignition engine is not affected by throttling the incoming charge.
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Which instrument is used for adjusting the ignition timing?
A. Accurate clock
B. Tachometer
C. Stopwatch
D. Stroboscopic light
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The function of the distributor is to distribute the ignition surges to the individual spark plug in the correct sequence and at the correct instants in time.
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Which of the following is the hottest part of the spark plug?
A. Terminal
B. Insulator tip
C. Shell
D. Gasket
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Due to throttling a smaller amount of charge enters the cylinder and the dilution due to residual gases is also greater.
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Which of the following condition is taken care of by the centrifugal advance mechanism?
A. Speed
B. Load
C. Temperature
D. Detonation
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Which device is used to control the quantity of oil circulation and to maintain correct pressure in the lubricating system?
A. Relief valve
B. Grease
C. Crankcase breather
D. By pass filter
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An ignition system should be compact and easy to maintain.
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The firing order of an I. C. engine depends upon
A. Design of crankshaft
B. No. of cylinders
C. Arrangement of cylinders
D. All of the above
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Battery is connected to the primary winding of the ignition coil through an ignition switch and blast resistor.
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The three basic components of primary ignition circuit are
A. The contact breaker, condenser and distributor cap
B. The contact breaker, ignition coil and spark plugs
C. The contact breaker, ignition switch and condenser
D. The contact breaker, ignition switch and rotor
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Which of the following statements is correct with regard to the heat range of spark plugs?
A. Spark plugs which have high heat dispersion performance are known as cold type spark plugs and those with low performance as hot type spark plugs
B. The spark plugs which have low heat dispersion performance are known as cold type spark plugs and those with high performance as hot type spark plugs
C. If the spark plugs are sooty, then cold plugs to be tried
D. If the spark plugs are sooty, then hot plugs to be tried
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The induction coil steps up low voltage current of 6 or 12 volts to high voltage current upto about
A. 10,000 volts
B. 17,000 volts
C. 25,000 volts
D. 35,000 volts
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