Q1.Basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc are
Answer : Option AExplaination / Solution:
Semiconductors are materials that have electrical conductivity between conductors such as most metals and nonconductors or insulators like ceramics. Semiconductor material is used in the manufacturing of electrical components and used in electronic devices such as transistors and diodes.
Semiconductors are the basic materials used in the present solid state electronic devices like diode, transistor, ICs etc
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
Q3.Electric potential energy of two point charges q and q0 is
Answer : Option BExplaination / Solution: Potential energy of a system of charges is the work done in assembling the charges. Force between two charges q and q0 placed at a distance r apart is F=q0q4πε0r2Potential energy of the charges is given by℧=∫∞r−F∙dr=∫∞r−q0q4πε0r2dr=qq04πε0r
Q4.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.
Q5.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
Q6.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.
Q7.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
Q8.Which of the following is most general charachteristic of Magnetic field
Answer : Option AExplaination / Solution: A moving charge experiences a force in a magnetic field called magnetic Lorentz force given byF⃗ =q(v⃗ ×B⃗ ).This force acts only if the particle (i) has charge q(ii) has a non zero velocity v and (iii) does not move parallel or anti parallel to the magnetic field B. A current carrying conductor placed in a magnetic field experiences a force given byF⃗ =Il⃗ ×B⃗