Electronic Science - Online Test

Q1. Basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc are
Answer : Option A
Explaination / 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
Answer : Option A
Explaination / Solution:




Q3. Electric potential energy of two point charges q and q0 is 
Answer : Option B
Explaination / 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 Potential energy of the charges is given by
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 B
Explaination / 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
Answer : Option D
Explaination / Solution:



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 C
Explaination / 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 
Answer : Option B
Explaination / Solution:



Q8. Which of the following is most general charachteristic of Magnetic field
Answer : Option A
Explaination / Solution:

A moving charge experiences a force in a magnetic field called magnetic Lorentz force given by.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 by
Q9. The minterm expansion of f 
Answer : Option A
Explaination / Solution:
No Explaination.


Q10. Two cells of 1.25 V and 0.75 V are connected in series with anode of one connected to anode of the other . The effective voltage will be
Answer : Option B
Explaination / Solution:

The cells are in opposition.