Recent questions tagged easy

A cylindrical bar magnet is kept along the axis of a circular coil and near it as shown in the fig. Will there be any induced e.m.f at the terminals of the coil, when the magnet is rotated about an axis perpendicular to the length of the magnet?

asked Dec 30, 2016 by suganyadevi.p

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A cylindrical bar magnet is kept along the axis of a circular coil and near it as shown in the fig. Will there be any induced e.m.f at the terminals of the coil, when the magnet is related about its own axis.

asked Dec 30, 2016 by suganyadevi.p

1 answer

A horizontal straight wire $10 \;cm$ long expending from east to west is falling with a speed of $5.0\; m/s $ at right angles to the horizontal component of the earth's magnetic field $0.30 \times 10^{-4}\;wb/m^2$. Which end of the wire is at the higher electrical potential ?

asked Dec 30, 2016 by priyanka.c

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A horizontal straight wire $10 \;cm$ long expending from east to west is falling with a speed of $5.0\; m/s $ at right angles to the horizontal component of the earth's magnetic field $0.30 \times 10^{-4}\;wb/m^2$. What is the direction of the induced $emf$.

asked Dec 30, 2016 by priyanka.c

1 answer

What is the output frequency of a full wave rectifier if the input frequency is $50\;Hz$

asked Dec 30, 2016 by meena.p

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A circular coil of radius 8.0 cm and 20 turns rotates about its vertical diameter with an angular speed of $ 50 rad s^{-1}$ in a uniform horizontal magnetic field of magnitude $ 3 \times 10^{-2} T$. Calculate the average emf.

asked Dec 30, 2016 by suganyadevi.p

1 answer

In half wave rectifier , what is the output frequency if the input frequency is $50\;Hz$?

asked Dec 30, 2016 by meena.p

1 answer

For tramister amplifier , the voltage gain ,

asked Dec 30, 2016 by meena.p

1 answer

Write a expression for mutual inductance of two coaxial solenoids.

asked Dec 30, 2016 by suganyadevi.p

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For a transistor action, which of the following statements are correct ?

asked Dec 30, 2016 by meena.p

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The rate of charge of magnetic flux has same units as induced e.m.f. Say true or false.

asked Dec 30, 2016 by suganyadevi.p

1 answer

Why does a metallic piece very hot when it is surrounded by a coil carrying high frequency alternating current??

asked Dec 30, 2016 by suganyadevi.p

1 answer

When a forward bias is applied to p-n junction , it

asked Dec 30, 2016 by meena.p

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In an unbiased p-n junction , holes different from the p-region to n-region because

asked Dec 30, 2016 by meena.p

1 answer

SI unit of magnetic flux is

asked Dec 30, 2016 by suganyadevi.p

1 answer

Carbon, silicon, and germanium have four valence electrons each. These are characterized by valence and conduction bands. Seperated by energy band gap respectively equal to $(Eg)_e,(Eg)_{si}$ and $(Eg)_{Ge}$. Which of the following statement is true ?

asked Dec 30, 2016 by meena.p

1 answer

Amount of change induced in a circuit of resistance R is given by

asked Dec 30, 2016 by suganyadevi.p

1 answer

A horizontal straight wire $10 \;cm$ long expending from east to west is falling with a speed of $5.0\; m/s $ at right angles to the horizontal component of the earth's magnetic field $0.30 \times 10^{-4}\;wb/m^2$. What is the instantaneous value of the $emf$ induced in the wire ?

asked Dec 30, 2016 by priyanka.c

1 answer

Which of the statement in p-type silicon , which of the following statement is true?

asked Dec 30, 2016 by meena.p

1 answer

A 2m long solenoid with diameter 4 cm and 2000 turns has a secondary of 1000 turns wound closely near it mid point. Calculate the mutual inductance between the two coils.

asked Dec 30, 2016 by suganyadevi.p

1 answer

In n-type silicon , which of the following statement is true?

asked Dec 30, 2016 by meena.p

1 answer

Use Lenz's law to determine the direction of induced current in the situation described by figure.

A circular loop being deformed in a narrow straight wire.

asked Dec 29, 2016 by priyanka.c

1 answer

Use Lenz's law to determine the direction of induced current in the situations described by figure
A wire of irregular shape turning into a circular shape.

asked Dec 29, 2016 by priyanka.c

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Current (I) decreasing at a steady state.

asked Dec 29, 2016 by priyanka.c

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Predict the direction of induced current in situation described above.

asked Dec 29, 2016 by priyanka.c

1 answer

Rheostat setting being changed.

asked Dec 29, 2016 by priyanka.c

1 answer

Predict the direction of induced current in the situation described above

asked Dec 29, 2016 by priyanka.c

1 answer

If $V_r$ is velocity of red light and $V_b$ is the velocity of blue light in vacuum, then

asked Oct 3, 2016 by meena.p

1 answer

Refractive index of ionosphere is

asked Oct 3, 2016 by meena.p

1 answer

The electro magnetic waves of frequency $2\; MHz$ to $30\;MHz$ are used

asked Oct 3, 2016 by meena.p

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Which of the following frequencies will be suitable for beyond the horizon communication ?

asked Oct 3, 2016 by meena.p

1 answer

A radio station has two channels . One is AM at $1020\;KHz$ and the other FM at $89.5\;MHZ$ For good result you will use

asked Oct 3, 2016 by meena.p

1 answer

LANDSAT series of satellite move in near polar orbits at an attitude of

asked Oct 3, 2016 by meena.p

1 answer

Modem is a device which perform

asked Oct 3, 2016 by meena.p

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Calculate the phase velocity of electro magnetic wave having electron density and frequency for D layer , $N = 400\; electron /cc, \nu = 300\;kHz$

asked Oct 3, 2016 by meena.p

1 answer

The maximum range of ground or surface wave propagation depends on

asked Oct 3, 2016 by meena.p

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Calculate the length of half wave dipole antenna at $300\;MHz$

asked Oct 3, 2016 by meena.p

1 answer

A 400 watt carrier is modulated to a depth of $75\%$ . calculate the total power in the modulated wave .

asked Oct 3, 2016 by meena.p

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A broad cast AM transmitter radiates $50 \;kw$ of carrier power . What will be the radiated power at $85 \%$ modulation ?

asked Oct 3, 2016 by meena.p

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Out of the following which is not an essential element of a communication system ?

asked Sep 30, 2016 by meena.p

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A repeater is a combination of

asked Sep 30, 2016 by meena.p

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If $\lambda$ is wave length of radio signals to be transmitted , then the length of Hertz antenna is

asked Sep 30, 2016 by meena.p

1 answer

Line of sight propagation is

asked Sep 30, 2016 by meena.p

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The correct radiation between plasma frequency $\nu$ of a radio wave length and electron density N of the ionosphere

asked Sep 30, 2016 by meena.p

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Sky wave propagation is also called

asked Sep 30, 2016 by meena.p

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A T.V transmission town antenna is at a height of 20 m . How much service area can it cover if the receiving antenna at a height of 25 m

asked Sep 30, 2016 by meena.p

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A T.V transmission town antenna is at a height of 20 m . How much service area can it cover if the receiving antenna at ground level

asked Sep 30, 2016 by meena.p

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Which of the following :- Would produce digital signals

asked Sep 30, 2016 by meena.p

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Which of the following :- Would produce analog signals

asked Sep 30, 2016 by meena.p

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Identify the mathematical expression for amplitude modulated wave

asked Sep 30, 2016 by meena.p

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