ECE :: Exam Questions Paper
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Which one of the following type of negative feedback increases the input resistance and decreases the output resistance of an amplifier?
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A load ZL = RL + jXL is to be matched using an ideal transformer to generator of internal impedance ZS = RS + jXS. The ratio of transformer required is __________ .
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An AC source or RMS voltage 20V with internal impedance Zs = (1 + 2j) Ω feeds a load of impedance ZL = (7 + 4j) Ω in the figure below. The reactive power consumed by the load is
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Electric dipole is located at origin in a medium with εr = 6, has a moment P = (4ax - 2ay + az ) nC. Then potential at (2, 4, 4) is:
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Voice signal band limited to 3.4 KHz is sampled and pulse code modulated using 64 quantization levels. Ten such signals are time division multiplexed using one 5-bit synchronizing word every alternate frame. The minimum channel bandwidth required for transmission of the TDM signal is
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Which of the following is/are correct statement(s)?
- Bus is a group of wires carrying information.
- Bus is needed to achieve reasonable speed of operation.
- Bus can carry data or address.
- A bus can be shared by more than one device.
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Assertion (A): A fixed bias BJT circuit exhibits better performance as compared to a self bias BJT circuit.
Reason (R): A fixed bias BJT circuit used less components as compared to a self bias BJT circuit.
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A linear time-invariant, causal continuous time system has a rational transfer function with simple poles at s = - 2 and s = - 4, and one simple zero at s = - 1. A unit step u(t) is applied at the input of the system. At steady state, the output has constant value of 1. The impulse response of this system is
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The signal cos ωct + 0.5 cos ωmt sin ωct is
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Which one of the following is a transferred electron device?
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