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Electric Circuits
A fuse in an electric circuit is designed to open the circuit like a switch when the current
exceeds a preset value. If a fuse is made of material that melts when the current density
reaches 400 A cm2, what is the diameter of the wire needed to limit the current to 0.30 A?
exceeds a preset value. If a fuse is made of material that melts when the current density
reaches 400 A cm2, what is the diameter of the wire needed to limit the current to 0.30 A?
Electric Circuits
A dielectric object is placed in an electric field. The object becomes polarised and a large
number of atomic/molecular dipoles in the object align in the direction of the applied
electric field. Derive an expression for the electric field produced by this polarised
dielectric at a point outside the dielectric object.
number of atomic/molecular dipoles in the object align in the direction of the applied
electric field. Derive an expression for the electric field produced by this polarised
dielectric at a point outside the dielectric object.
Electric Circuits
A sphere of radius R carries a charge of volume charge density r = cr, where c is a
constant and r denotes the distance from the centre of the sphere. Calculate the total
charge enclosed by the sphere and the electric field at points lying inside and outside the
sphere.
constant and r denotes the distance from the centre of the sphere. Calculate the total
charge enclosed by the sphere and the electric field at points lying inside and outside the
sphere.
Electric Circuits
Two electric charges 2 μC and –1 μC are placed at a distance of 20 cm from each other in
vacuum. Locate the point on the line joining these two charges outside the region
between them at which the electric potential is zero with reference to the positive charge.
vacuum. Locate the point on the line joining these two charges outside the region
between them at which the electric potential is zero with reference to the positive charge.
Electric Circuits
Let the charges Q and −Q be placed alternatively along the x-axis at positions
x = 1 m, x = 3 m, x = 6 m and x = 9 m. What is the electric field at x = 0 due to these
charges?
x = 1 m, x = 3 m, x = 6 m and x = 9 m. What is the electric field at x = 0 due to these
charges?
Electric Circuits
a) Design a Mod 12 counter.
b) Explain the ALT and CHOP modes of dual trace oscilloscope
b) Explain the ALT and CHOP modes of dual trace oscilloscope
Electric Circuits
a)Design a circuit using op-amp to give +12V at output when input signal is less than –4V
and –12V when it is more than –4V.
b)Propose a circuit to obtain +10V dc regulated output using IC 7812.
and –12V when it is more than –4V.
b)Propose a circuit to obtain +10V dc regulated output using IC 7812.
Electric Circuits
Calculate the minimum slew rate of the op-amp used for obtaining 2 MHz frequency,
+ -10V amplitude triangular wave signal at the output.
+ -10V amplitude triangular wave signal at the output.
Electric Circuits
a)With the help of a circuit diagram explain, how regenerative feedback is provided in
Hartley oscillator.?
b)Design and draw a zener voltage regulator to provide 10V output if load resistance varies
between 50 Ω and 200Ω . Assume that the input unregulated dc voltage is 15V and
minimum zener operating current is 10 mA. Calculate the wattage of the Zener diode,
value and wattage of Rs
Hartley oscillator.?
b)Design and draw a zener voltage regulator to provide 10V output if load resistance varies
between 50 Ω and 200Ω . Assume that the input unregulated dc voltage is 15V and
minimum zener operating current is 10 mA. Calculate the wattage of the Zener diode,
value and wattage of Rs
Electric Circuits
a)With the help of an appropriate bias (iC Vs vCE) plot explain, why class A bias is used for
amplifiers while class C bias is used only for oscillators.?
b)With the help of a circuit diagram explain how push-pull amplifier provides distortion free
performance inspite of using class B biasing.?
amplifiers while class C bias is used only for oscillators.?
b)With the help of a circuit diagram explain how push-pull amplifier provides distortion free
performance inspite of using class B biasing.?
