In a four cylinder, four stroke, diesel engine operating at 1500 the duration of fuel injection is 20°. Time in milliseconds during which fuel is injected would be
The spark plug gap is normally maintained at
The function of a distributor in an automobile is to
The function of the distributor is to distribute the ignition surges to the individual spark plugs in the correct sequence and at the correct instants in time.
Air injection in l.C. engines refers to injection of
Solid injection in l.C. engines refers to injection of
The essential equipment for producing high voltage for sparking in petrol engines with battery is
Most of the modern SI engines use battery ignition system. In this system, the energy required for producing spark is obtained from a 6 or 12 V battery. The essential components of the system are:
(ii) ignition switch
(iii) ballast resistor
(iv) ignition coil
(v) contact breaker
(vi) capacitor or condenser
(viii) spark plug
An ignition coil in the spark engine performs the function of
Which of the following type of battery is commonly used in automobile applications?
The ignition coil in a automobile acts as a
The purpose of the ignition coil is to step up the 6 or 12 volts of the battery to a high voltage, sufficient to induce an electric spark across the electrodes of the spark plug.
A normal type of coil in conventional ignition fitted to a four cylinder engine has three cables connected to.it. The thick, highly insulated cable connects the coil with
Which of the following is not true pertaining to contact breaker ?
What material is used for the insulating body of a spark plug ?
In a cycle, the spark roughly lasts for
Which of the following is not the function of condenser connected across the contact breaker?
Option (a) is the function of contact breaker.
Which of the following is not true in context of dwell period ?
Which of the following is common in magneto ignition system and coil ignition system ?
The magneto in an automobile is basically a/an
Magneto is a special type of electric generator. It is mounted on the engine and replaces all the components of the coil ignition system except the spark plug. A magneto, when rotated by the engine, is capable of producing very high voltage and does not need a battery as a source of external energy.
For a spark plug designated M12 x 2, the last digit 2 stands for
White deposits on the face of spark plug suggest that
Consider the following statement:
1. For a petrol engine, the mean effective pressure increases as the compression ratio increases.
2. In a petrol engine, the high voltage for spark is of order of 1000 V.
3. The material for center electrode in a spark plug is carbon.
Q. Which of the statement given above is/are correct?
A hot plug has
Insulator tip length is the most significant design parameter which controls the spark plug heat range or operating temperature, A hot plug generally have a long insulator tip, hence a long heat rejection path.
Battery ignition system
Choose the wrong statement:
Ignition timing is adjusted by
Vacuum advance spark timing mechanism shifts the ignition point under
In this mechanism, the adjustment control quantity is the static vacuum prevailing in the carburettor, a pressure which depends on the position of throttle value of any given time and which is at a maximum when this valve is about half open. So, this mechanism operates for part load operation.
Consider following factors pertaining to optimum firing order of an engine:
1. Engine vibrations
2. Exhaust gas flow regulation
3. Engine cooling
4. Development of back pressure
Q. Which of these factors must be considered?
Advantage of air injection system is
Fuel injection pressure in solid injection system is around
Main advantage of pintaux nozzle is
The most accurate gasoline injection system is