HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Important Questions

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A conductor rod of length (l) is moving with velocity (v) in a direction normal to a uniform magnetic field (B). What will be the magnitude of induced emf produced between the ends of the moving conductor?

When an AC source is connected to an ideal inductor show that the average power supplied by the source over a complete cycle is zero.

Derive an expression for the impedance of an LCR circuit connected to an AC power supply. Draw phasor diagram.

A 25 μF capacitor, a 0.10 H inductor, and a 25Ω resistor are connected in series with an AC source whose emf is given by e = 310 sin 314 t (volt). What is the frequency, reactance, impedance, current, and phase angle of the circuit?

Why are the emitter, the base, and the collector of a BJT doped differently?

The common-base DC current gain of a transistor is 0.967. If the emitter current is 10mA. What is the value of base current?

In a common-base connection, a certain transistor has an emitter current of 10mA and a collector current of 9.8 mA. Calculate the value of the base current.

In a common-base connection, the emitter current is 6.28 mA and the collector current is 6.20 mA. Determine the common-base DC current gain.

A circular coil of 100 turns with a cross-sectional area of 1 m² is kept with its plane perpendicular to the magnetic field of 1 T. The magnetic flux linkage is ______.

Derive the relation between α and β.

Distinguish between Step up and Step Down Transformer.

What is Transformer?

Obtain an expression for the self-inductance of a solenoid.

Draw a neat labelled circuit diagram of a full-wave rectifier using a semiconductor diode.

In a common base configuration, the transistor has an emitter current of 10 mA and a collector current of 9.8 mA. The value of base current is ______ 

For a transistor I_C = 15 mA, I_B = 0.5 mA. What is the current amplification factor?  

An emf of 91 mV is induced in the windings of a coil when the current in o nearby coil is increasing at the rate of 1.3 A/s. what is the mutual inductance (M) of the two coils in mH?

What is a rectifier?

What is the average value of alternating current over a complete cycle?

Explain the working of the n-p-n transistor in a common base configuration.