List of top Questions asked in CBSE CLASS XII- 2025

The speed of the generator at which its output voltage just rises above the voltage of the battery being charged is called ............... speed.
The DC charging system offers ............... voltage output, particularly at low speeds or idle speeds of engine.
The function of engine speed sensor is to monitor engine speed, which is one of the factors used to calculate ............... .
Three quarter floating type of rear live axle is used in ............... vehicles.
In rear axle, the drive from the propeller shaft is transmitted via the crown wheel and pinion, to both rear wheels by means of the ............... .
The three way catalytic converter is the most ideal type of catalytic converter since it can convert not only CO and HC, but also ............... into non-polluting substances.
A constant velocity joint, consisting of a housing, a spider and a set of three rollers is called ............... joint.
Cross or spider type of variable velocity joints, consist of two Y-shaped yokes, connected at right angles to each other by means of a ............... .
The propeller shaft is normally made by seamless steel tubing method with ............... welded to both ends of the shaft.
In MacPherson strut suspension, the upper end of the shock absorber and the top of the coil spring are made to sit on the seat provided on the ............... .
In mechanical shock absorbers, the friction action of metallic discs is utilized to control the spring action whereas in hydraulic shock absorber fluid it is used to ............... .
............... leaf spring refers to a semi-elliptical spring mounted in an inverted manner and has a saddle above, forming a bow and is attached parallel to the wheel axle.
In case of commercial licence renewal, one of the documents required is ............... from the transport authority.
In oscillation of sprung weight, ............... occurs by turning or driving the vehicle on a bumpy road, in which the springs on one side of the vehicle expand, while those on other side contract.
Independent suspension can overcome the difficulty in the rigid suspension by making the two front wheels ............... each other.
One of the two advantages of power steering system is that it reduces the number of turns of steering wheel required to move it from ............... .
The gear in the steering gear box assembly not only steers the front wheels, but at the same time they can act as reduction gears, reducing steering wheel turning efforts by increasing the ............... .
In worm and nut with re-circulating ball steering gear box, a ball nut is mounted on the ............... .
Excessive positive caster angle results in hard steering, causing road shocks to be felt at the ............... .
The radius of the circle on which the outside front wheel moves, when the front wheels are turned to their extreme outer position, is known as ............... radius.
Which of the following eases the drive effort in steering the vehicle?
The static balance of wheel, with the use of a sensor mounted to the spindle assembly, is measured by the ............... .
A wing type Air Valve Control is provided on the top of the spark plug cleaner to control the flow of ............... during sandblast cleaning of spark plugs.
Automatic type tyre inflators are normally digital type and can be electronic pre-set type with ............... also.
Sometimes, in suspension system, instead of standard type of coil springs ............... type of coil springs are used in automobiles.