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Electric Circuits
Explain what happens to the potential difference across a discharging capacitor after three (3) time constants have elapsed. (3 marks)
Electric Circuits
what are the magnitude and direction of the electric field at point midway between a -8.0μC and a 7.00μC charge 8.0 cm apart? assume no other charges are nearby
Electric Circuits
20 kHz audio signal is amplitude modulated over a 100 kHz carrier frequency. The peak amplitude of carrier wave is 10 V. If the modulation index is 0.8, find out the frequencies present in the modulated output. Also calculate the ratio of maximum and the minimum amplitude of the envelope of modulated signal.
Electric Circuits
With the help of a circuit diagram explain, how regenerative feedback is provided in Hartley oscillator.
Electric Circuits
Which type of amplifier is used for obtaining both current and voltage gains? Draw a
circuit of such amplifier in fixed bias condition using a p-n-p transistor. (Clearly indicate
the polarities of biasing voltages.) What are the limitations of fixed biasing? How are
these limitations overcome by using universal bias?
circuit of such amplifier in fixed bias condition using a p-n-p transistor. (Clearly indicate
the polarities of biasing voltages.) What are the limitations of fixed biasing? How are
these limitations overcome by using universal bias?
Electric Circuits
Design and draw voltage regulator to provide 4 to 10V variable output voltage using IC 7812.
Electric Circuits
Design an adder circuit using op-amp to satisfy following equation:
- Vo = V1 + 3 V2 + 2 V3 + 2V4 + 4V5 The supply voltage of the op-amp is +- 13V and output saturation voltage is +- 12 V. The circuit should always operate in its linear range. What are the minimum-maximum voltage values of V1, V2, V3, V4 and V5 when only one of them is connected to the input at a given time (i.e. other input voltages are zero)? What is the value of maximum voltage Vi if V1 = V2 = V3 = V4 = V5 = Vi ?)
- Vo = V1 + 3 V2 + 2 V3 + 2V4 + 4V5 The supply voltage of the op-amp is +- 13V and output saturation voltage is +- 12 V. The circuit should always operate in its linear range. What are the minimum-maximum voltage values of V1, V2, V3, V4 and V5 when only one of them is connected to the input at a given time (i.e. other input voltages are zero)? What is the value of maximum voltage Vi if V1 = V2 = V3 = V4 = V5 = Vi ?)
Electric Circuits
Design and draw a zener voltage regulator to provide 12V output if load resistance varies between 100 ohm and 200 ohm. Assume that the input unregulated dc voltage is 18V and minimum zener operating current is 10 mA. Calculate the wattage of the Zener diode, value and wattage of RS.
Electric Circuits
State, with reasons, whether the following statements are True or False.
i) Diode is a bilateral device.
ii) Parallel LCR circuit can be used as a band-pass filter.
iii) A pentavalent element is added to silicon to obtain an p-type semiconductor.
iv) Feedback in a circuit always reduces its gain.
v) Barkhausen criterion gives the condition for stabilization of an amplifier gain.
vi) When input is given to an op-amp in open loop condition the output voltage is
infinite.
vii) Rectifier in a power supply regulates its output voltage.
viii) According to De Morgens’ theorem
A(BAR) x B(BAR) = AxB(BAR)
ix) Ring counter with 4 flip flops can count 32 pulses.
x) The sensitivity of flux meter is independent of the number of turns of the search
coil.
i) Diode is a bilateral device.
ii) Parallel LCR circuit can be used as a band-pass filter.
iii) A pentavalent element is added to silicon to obtain an p-type semiconductor.
iv) Feedback in a circuit always reduces its gain.
v) Barkhausen criterion gives the condition for stabilization of an amplifier gain.
vi) When input is given to an op-amp in open loop condition the output voltage is
infinite.
vii) Rectifier in a power supply regulates its output voltage.
viii) According to De Morgens’ theorem
A(BAR) x B(BAR) = AxB(BAR)
ix) Ring counter with 4 flip flops can count 32 pulses.
x) The sensitivity of flux meter is independent of the number of turns of the search
coil.
Electric Circuits
Design a TDM system to handle 3 PAM channels if the maximum input frequency of each channel is 5 kHz.
