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Solid state devices


Solid state devices are electronic devices where the flow of electricity is through solid semiconductors. These electronic devices do not comprise any moving parts, where electronic action occurs in solid state.Their application is related to the field where it is utilised to interface with all human senses. 


Solid state devices Sample Questions:


Question 1: ____________ is the amount of additional energy required to emit an electron from the metal surface.

a) Potential barrier  
b) Potential junction
c) Work function   
d) None of these  


Answer: Work function   

Explanation: The minimum amount of energy required to remove an electron to infinity from the metal surface is known as work function.



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Question 2: The base of the transistor is _________ doped. 


a) heavily                    b) lightly
c) both (a) and (b)       d) none of these

Answer: lightly

Explanation: The base of the transistor is lightly doped as it carries the electrons from the emitter and passes it to the collector region. 



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Question 3: The two possible breakdown mechanisms in p-n junction diodes are ____________. 


a) threshold and knee breakdown 
b) avalanche and zener breakdown
c) avalanche and forward breakdown 
d) reverse and forward  breakdown  

Answer: avalanche and zener breakdown

Explanation: The avalanche breakdown and zener breakdown are two different mechanisms by which the p-n junction diode breaks. They both occur under reversed biased conditions. 



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Question 4:  If every atom in the silicon crystal is a silicon atom, then it is an ___________ semiconductor.


a) intrinsic                          b) extrinsic
c) both (a) and (b)              d) none of these 


Answer: intrinsic 

Explanation: Intrinsic semiconductors are the purest form of semiconductors. The charge carrier contains an equal number of electron and holes with no impurities. 



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Question 5: _______________ is the creation of free electrons through the zener effect


a) Avalanche emission           b) Thermionic emission 
c) Low-field emission             d) High-field emission 


Answer: High-field emission 

Explanation: In high-field emission inside the conductor, free electrons are pulled out of the metal surface. This effect is primarily caused by the zener effect. 



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Question 6: What is the maximum reverse voltage that can be applied before the current surges ?


a) Junction voltage                                     b) Forward voltage 
c) Reverse breakdown voltage                  d) Recovery voltage 

Answer: Reverse breakdown voltage

Explanation:  Reverse breakdown voltage is the maximum allowable value of  reverse voltage that can be applied before the surge in current.



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Question 7: At what temperature the semiconductor behaves like an insulator. 


a) 100 K                  b) 0 K
c) 1 K                      d) 5 K

Answer: 0 K

Explanation: At a normal room temperature, a semiconductor contains sufficient free electrons to conduct current. But at absolute zero, free electrons in the valence band do not possess enough thermal energy to overcome the energy gap. It acts as an insulator at absolute zero temperature. 



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Question 8: When the number of free electrons is increased in the doped semiconductor, it transforms into ____________ semiconductor.


a) p type                  b) n type 
c) np type                d) pn type 


Answer: n type  

Explanation:  In n type semiconductor, free electrons are the carri



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Question 9: Which of the following impurities should be added to pure semiconductor to  make a N-type semiconductor?


a) Aluminium               b) Phosphorus 
c) Indium                     d) None of these 

Answer: Phosphorus 

Explanation:  When pentavalent compound is added to pure semiconductor, N-type semiconductor is formed. Here, only phosphorus is pentavalent compound. 



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Question 10: ___________ and __________ are the parameters over which a diode characteristic is made. 


a) Current, time                  b) Voltage, time
c) Current, frequency         d) Voltage, current


Answer: Voltage, current

Explanation: Voltage versus current graph in which current is represented on Y-axis and voltage is denoted on X-axis.  



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