ECE :: Exam Questions Paper
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Consider the following statements:
- Acceptor level is formed very close to the conduction band.
- The effective mass of the free electron is same as that of a hole.
- The magnitude of the charge of a free electron is same as that of a hole.
- Addition of donor impurities adds holes to the semiconductor.
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The following properties are associated with ferroelectric materials:
- Its susceptibility is negative.
- The susceptibility is expressed as
where c is the Curie constant and Tc is the Curie temperature. - It has permanent dipoles oriented randomly.
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Consider the following statements:
For a master-slave J-K flip-flop,- the toggle frequency is the maximum clock frequency at which the flip-flop will toggle reliably.
- the data input must precede the clock triggering edge transition time by time minimum time.
- the data input must remain fixed for a given time after, the clock triggering edge transition time for reliable operation.
- propagation delay time is equal to the rise time and fall time of the data.
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There are four different algorithms A1, A2, A3 and A4 to solve, a given problem with the complexity order log(n), log(log(n)), n log and n/log(n) respectively. Which is the best algorithm?
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In Quine-Mclusky method of Boolean function reduction; __________ , are treated as __________ and therefore discrepancies may occur in the final solution, therefore this method is not applicable to the functions with __________ .
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The figure below shows a long infinite length conduction placed as shown.
Current flowing in a conductor is 2 amps. Then magnetic field at point A is: -
Consider the following statements regarding the class-B power amplifiers (Complementary symmetry type):
- The efficiency of the amplifier is higher than that of class-A amplifier
- The power output is low
- Crossover distortion is present
- The standby power dissipation is absent.
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Consider the following statements:
For a 10 m long common power line connecting a switch to a light bulb- It is a distributed circuit.
- Time delay for propagation through it is negligible.
- It is the form of a shielded coaxial cable of circular cross-section.
- As the intensity of the lamp varies, input impedance of this line also changes.
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The equivalent of the block diagram in figure is given in
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For a Hertz dipole antenna, the Half Power Beam Width (HPBW) in the E-plane is
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