Q1.A plane wave of wavelength λ is traveling in a direction making an angle 300 with positive x − axis and 900 with positive y − axis. The field of the plane
wave can be represented as (E is constant)
Q2.A p n junction has a built-in potential of 0.8 V. The depletion layer width a
reverse bias of 1.2 V is 2 μm. For a reverse bias of 7.2 V, the depletion layer
width will be
An open loop system represented by the transfer function is
Answer : Option BExplaination / Solution:
Open loop system stability is depends only on pole locations ⇒ system is stable
There is one zero on right half of s-plane so system is non – minimum phase
Q5.Consider the following statement
(i) The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the current coil.
(ii) The compensating coil of a low power factor wattmeter compensates the effect 0of the impedance of the voltage coil circuit.
Answer : Option BExplaination / Solution: No Explaination.
Q6.A low – pass filter with a cut-off frequency of 30Hz is cascaded with a high-pass filter with a cut-off frequency of 20Hz. The resultant system of filters will function as
Q7.A three-phase current source inverter used for the speed control of an induction
motor is to be realized using MOSFET switches as shown below. Switches S1 to S6 are identical switches.
The proper configuration for realizing switches S1 to S6 is
Answer : Option CExplaination / Solution: No Explaination.
Q8.The voltage applied to a circuit is volts and the circuit draws
a current of amperes. Taking the voltage as the
reference phasor, the phasor representation of the current in amperes is