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Electric Circuits
2. Prove that the reciprocity theorem is valid for the circuit shown in Fig. 1.
Fig. 1
3. Determine the resonant frequency for the circuit shown in Fig. 2. Calculate the impendence
of the circuit 5 kHz above and 5 kHz below the resonance frequency.
Fig. 2
Fig. 1
3. Determine the resonant frequency for the circuit shown in Fig. 2. Calculate the impendence
of the circuit 5 kHz above and 5 kHz below the resonance frequency.
Fig. 2
Electric Circuits
Two resistances
2Ω
and
3Ω
are in parallel. The combination is in series with
1.5Ω
resistance and a power supply of voltage V. There is a current of 3A through the
2Ω
resistance. What are the values of the current I delivered by, and the voltage V across the power supply?
Two wires P ad Q, each of the same length and same material, are connected in parallel to a battery. The diameter of P is half that of Q. What fraction of the total current passes through P?
In an experiment to determine the relationship between the current I through a piece of tungsten wire and the potential difference V across it, the theoretical relationship used was
I=kVn
, where k and n are constants which may be obtained from a straight line graph of the form y = mx + c, the symbols having their usual meaning. The corresponding linear equation for this experiment is
A current of 0.5A flowing through a wire produces 21J of heat in 1/2 min. The resistance of the wire is ----------- ohms to 1 place of decimal
2Ω
and
3Ω
are in parallel. The combination is in series with
1.5Ω
resistance and a power supply of voltage V. There is a current of 3A through the
2Ω
resistance. What are the values of the current I delivered by, and the voltage V across the power supply?
Two wires P ad Q, each of the same length and same material, are connected in parallel to a battery. The diameter of P is half that of Q. What fraction of the total current passes through P?
In an experiment to determine the relationship between the current I through a piece of tungsten wire and the potential difference V across it, the theoretical relationship used was
I=kVn
, where k and n are constants which may be obtained from a straight line graph of the form y = mx + c, the symbols having their usual meaning. The corresponding linear equation for this experiment is
A current of 0.5A flowing through a wire produces 21J of heat in 1/2 min. The resistance of the wire is ----------- ohms to 1 place of decimal
Electric Circuits
6. a) Calculate the minimum slew rate of the op-amp used for obtaining 2 MHz frequency, 10V amplitude triangular wave signal at the output.
Electric Circuits
9.
a) Design a Mod 12 counter.
b) Explain the ALT and CHOP modes of dual trace oscilloscope.
a) Design a Mod 12 counter.
b) Explain the ALT and CHOP modes of dual trace oscilloscope.
Electric Circuits
8.
a) Convert 0010001010000110 (BCD) into its binary equivalent and then divide it by
100102. Express your result in octal equivalent.
b) Design a half adder circuit using only NAND gates.
a) Convert 0010001010000110 (BCD) into its binary equivalent and then divide it by
100102. Express your result in octal equivalent.
b) Design a half adder circuit using only NAND gates.
Electric Circuits
7.
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.
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.
Electric Circuits
5.
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 Ohm and 200 Ohm. 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.
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 Ohm and 200 Ohm. 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
4.
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.
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.
Electric Circuits
1. State, with reasons, whether the following statements are True or False.
i) Transistor is a bilateral device.
ii) Capacitor and inductor are frequency dependent attenuators.
iii) The filament (cathode) in a vacuum diode is positive with respect to anode.
iv) The best voltage gain can be obtained in common collector configuration of an amplifier.
v) For sustained oscillations it is necessary to have Abita>1.
vi) CMRR of an op-amp determines its noise immunity.
vii) With LM380 IC we can obtain only a fixed gain of 50.
viii) Only the decimal numbers divisible by 16 can be represented by hex system.
ix) D-latch uses edge triggering.
x) Computers can work with only Read Only Memory (ROM).
i) Transistor is a bilateral device.
ii) Capacitor and inductor are frequency dependent attenuators.
iii) The filament (cathode) in a vacuum diode is positive with respect to anode.
iv) The best voltage gain can be obtained in common collector configuration of an amplifier.
v) For sustained oscillations it is necessary to have Abita>1.
vi) CMRR of an op-amp determines its noise immunity.
vii) With LM380 IC we can obtain only a fixed gain of 50.
viii) Only the decimal numbers divisible by 16 can be represented by hex system.
ix) D-latch uses edge triggering.
x) Computers can work with only Read Only Memory (ROM).
Electric Circuits
Wire of infinite length l carrying current I produces magnetic field of B Tesla at a distance of 10 cm on the perpendicular bisector of its length. If this wire is converted into a circular loop of single turn, find the expression for magnetic field at its centre?
