ELEX10 – Power Electronics (Latest 2026 /
2027 Updates) Questions and Answers
{Grade A } 100% Correct (Verified Answers)
A Shockley diode is a ______ device .
A. unilateral
B. bilateral
C. bidirectional
D. unipolar - correct answer A. unilateral
A Shockley diode can be thought of as two BJT transistors connected as :
A. NPN and PNP with both emitters acting as terminals and base - collector terminals
are tied up .
B. Two NPNs with both emitters acting as terminals and base - collector terminals are
tied up .
,C. Two PNPs with both emitters acting as terminals and base - collector terminal are
tied up .
D. NPN and PNP with both collectors acting as terminals and base - emitters terminals
are tied up . - correct answer A. NPN and PNP with both emitters acting as terminals
and base - collector terminals are tied up .
To turn on a Shockley diode :
A. the IG must be positive
B. the VG must be positive with respect to the cathode
C. the VAK must be a forward - bias voltage
D. the VAK must be a forward - bias voltage and reached the forward breakover
voltage - correct answer D. the VAK must be a forward - bias voltage and reached the
forward breakover voltage
To turn off a Shockley diode :
,A. the IA must drop below the IH
B. the IA must be greater than the IS
C. the VAK must be lower than the VAK
D. all of the choices - correct answer A. the IA must drop below the IH
The value of IA where the anode current begins to rise significantly .
A. IS
B. IH
C. IA
D. IBR ( f ) - correct answer A. IS
At anode current below the IS , the Shockley is at the :
A. ON state
B. OFF state
C. Saturation state
, D. negative resistance state - correct answer B. OFF state
At anode current above the IH , the Shockley is at the :
A. ON state
B. OFF state
C. cut off state
D. negative resistance state - correct answer A. ON state
A three terminal unilateral PNPN device that could be triggered to conduction at the
gate .
A. PUT
B. Triac
C. SCS
D. SCR - correct answer D. SCR
2027 Updates) Questions and Answers
{Grade A } 100% Correct (Verified Answers)
A Shockley diode is a ______ device .
A. unilateral
B. bilateral
C. bidirectional
D. unipolar - correct answer A. unilateral
A Shockley diode can be thought of as two BJT transistors connected as :
A. NPN and PNP with both emitters acting as terminals and base - collector terminals
are tied up .
B. Two NPNs with both emitters acting as terminals and base - collector terminals are
tied up .
,C. Two PNPs with both emitters acting as terminals and base - collector terminal are
tied up .
D. NPN and PNP with both collectors acting as terminals and base - emitters terminals
are tied up . - correct answer A. NPN and PNP with both emitters acting as terminals
and base - collector terminals are tied up .
To turn on a Shockley diode :
A. the IG must be positive
B. the VG must be positive with respect to the cathode
C. the VAK must be a forward - bias voltage
D. the VAK must be a forward - bias voltage and reached the forward breakover
voltage - correct answer D. the VAK must be a forward - bias voltage and reached the
forward breakover voltage
To turn off a Shockley diode :
,A. the IA must drop below the IH
B. the IA must be greater than the IS
C. the VAK must be lower than the VAK
D. all of the choices - correct answer A. the IA must drop below the IH
The value of IA where the anode current begins to rise significantly .
A. IS
B. IH
C. IA
D. IBR ( f ) - correct answer A. IS
At anode current below the IS , the Shockley is at the :
A. ON state
B. OFF state
C. Saturation state
, D. negative resistance state - correct answer B. OFF state
At anode current above the IH , the Shockley is at the :
A. ON state
B. OFF state
C. cut off state
D. negative resistance state - correct answer A. ON state
A three terminal unilateral PNPN device that could be triggered to conduction at the
gate .
A. PUT
B. Triac
C. SCS
D. SCR - correct answer D. SCR
