Explain briefly, with the help of a circuit diagram, the transistor action of npn transistor in CE configuration. Draw the typical shapes of input and output characteristics.
CBSE OUTSIDE DELHI - SET 1 EAST 2016
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Transistor works only when its emitter-base junction is forward biased and collector-emitter junction is reversed biased. Due to this the majority charge carriers from the emitter, accelerate to collector side and create $?_?,?_?$ and $?_?$ such that $?_?= ?_?+ ?_{?.}$
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An inductor L of inductance XL is connected in series with a bulb B and an ac source. How would brightness of the bulb change when (i) number of turns in the inductor is reduced, (ii) an iron rod is inserted in the inductor and (iii) a capacitor of reactance $X_C = X_L$ is inserted in series in the circuit. Justify your answer in each case.
For a glass prism $(\mu =\sqrt{3} )$ the angle of minimum deviation is equal to the angle of the prism. Calculate the angle of the prism.
Draw ray diagram when incident ray falls normally on one of the two equal sides of a right angled isosceles prism having refractive index $\mu = \sqrt{3} . $
A metallic rod of length ‘l’ is rotated with a frequency ‘v’, with one end hinged at the centre and the other end at the circumference of a circular metallic ring, about an axis passing through the centre and perpendicular to the plane of the ring. A constant and uniform magnetic field B parallel to the axis is present everywhere.
Obtain the expression for the emf induced between the centre and the ring.
Given that the rod has resistance ‘R’, then how much power will be generated?
What is space wave propagation? State the factors which limit its range of propagation. Derive an expression for the maximum line of sight distance between two antennas for space wave propagation.
When an inductor L and a resistor R in series are connected across a 12 V, 50 Hz supply, a current of 0.5 A flows in the circuit. The current differs in phase from applied voltage by $\pi/3$ radian. Calculate the value of R.
State Biot – Savart law. Deduce the expression for the magnetic field at a point on the axis of a current carrying circular loop of radius ‘R’, distant ‘x’ from the centre. Hence write the magnetic field at the centre of a loop.
In the given circuit, the potential difference across the inductor L and resistor R are 200V and 150V respectively and the rms. value of current is 5A. Calculate (i) the impedance of the circuit and (ii) the phase angle between the voltage and the current.
Write two important considerations used while fabricating a Zener diode. Explain, with the help of a circuit diagram, the principle and working of a Zener diode as voltage regulator.