by Sunday | Oct 1 | NABTEB QUESTIONS
(i) A junction diode conducts only when it is forward biased. (ii) A junction diode does not conduct when it is reverse biased
by Sunday | Oct 1 | NABTEB QUESTIONS
(i) Colour generator 1. Used for convergence adjustments for colour picture tube. 2. Used for checking convergence error. 3. Used for checking linearity of the vertical and horizontal scanning. 4. It provides signals for (i) small, white dots in horizontal rows and...
by Sunday | Oct 1 | NABTEB QUESTIONS
1. Picture rolling up or down the screen Faulty vertical and horizontal oscillator 2. Pictures divided into segment with diagonal bars Faulty horizontal oscillator and AFC 3. Picture drifting to the right or left Faulty sync separator, video stage and Automatic Gain...
by Sunday | Oct 1 | NABTEB QUESTIONS
1. CONTROL: For the adjustment of TV signals; colour, sound and picture as desired 2. BRIGHTNESS 1. A brightness control will vary the overall illumination 2. It automatically adjusts picture-tube brightness to compensate for different room-ambient lighting conditions...
by Sunday | Oct 1 | NABTEB QUESTIONS
(a) Multimeter: A multi meter is an electronic instrument which can measure resistances, currents and voltages. It is an indispensable instrument and can be used for measuring D.C. as well as A.C. voltages and currents. Multi meter is the most inexpensive equipment...
by Sunday | Oct 1 | NABTEB QUESTIONS
Common- emitter circuits Common- collector circuits Common- base circuits 1. COMMON EMITTER CIRCUITS: When the emitter of a transistor is connected to a point that is common to the input and output circuits, the configuration is referred to as a common-emitter...