ECE :: Exam Questions Paper
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Assertion (A): It is not desirable to drive a transistor into hard saturation in high speed switching circuits.
Reason (R): It may not be possible to bring it back to cutoff state, if it is driven into hard saturation.
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For an N-point FFT algorithm with N = 2m which one of the following statements is TRUE?
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What is the address space of 8086 CPU?
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In the slotted line measurement for standing wave Ratio (SWR), the distance between the two 3-dB points is Δd and λ' the wavelength along the transmission line. SWR of the transmission system is given by
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Why npn-transistors are preferred over pnp-transistors?
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For parallel plane waveguides, which is the mode with lowest cut-off frequency?
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Which of the following conditions must be satisfied for a transistor to remain under saturation?
- Its collector to base junction should be under forward bias.
- Its collector to base junction should be under reverse bias.
- Its emitter to base junction should be under reverse bias.
- Its emitter to base junction should be under forward bias.
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Voltage 1 + 2 sin ωt is applied to the circuit shown below:
The capacitor C and diode D can be considered ideal. RL is very large resistance. Then the magnitude of the average voltage across RL is __________ volt. -
Which of the following statements is not correct?
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A.
Leakage current in npn-transistors is less than pnp-transistors
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B.
Mobility of majority carrier in npra-transistors is greater than the mobility of majority carrier in pnp-transistors
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C.
Bias voltage required in npn is less than in/wp-transistors
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D.
Bias voltage required in npn is greater than in pnp-transistors
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A.
Propagation delay is the time required for a gate to change its state
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B.
Noise immunity is the amount of noise which can be applied to the input of a gate without causing the gate to change state
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C.
Fan-in of a gate is always equal to fan-out of the same gate
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D.
Operating speed is the maximum frequency at which digital data can be applied to a gate
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