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Electrical Engineering Mcqs

The typical value of SCR for modern alternator is____________?

  • (A)  1.5.
  • (B)  0.5.
  • (C)  1.0.
  • (D)  1.2.
Submitted By :Ali Uppal


A Triac has three terminals viz ___________?

  • (A)  Drain, source, gate
  • (B)  Two main terminal and a gate terminal
  • (C)  Cathode, anode, gate
  • (D)  None of the above
Submitted By :Ali Uppal


A thyristor is basically________?

  • (A)  PNPN device
  • (B)  A combination of diac and triac
  • (C)  A set of SCRs
  • (D)  A set if SCR,diac and triac
Submitted By :Ali Uppal


A PNPN device having two gates is ___________?

  • (A)  Diac
  • (B)  Triac
  • (C)  SUS
  • (D)  BCS
Submitted By :Ali Uppal


A silicon controlled racitifier (SCR) is a ____________?

  • (A)  Unijunction device
  • (B)  Device with three junction
  • (C)  Device with four junction
  • (D)  None of the above
Submitted By :Ali Uppal


A thyristor equivalent of a thyratron tube is a _________?

  • (A)  Diac
  • (B)  Triac
  • (C)  Silicon controlled-rectifier SCR
  • (D)  None of above
Submitted By :Ali Uppal


A Triac is a ______________?

  • (A)  2 terminal switch
  • (B)  2 terminal bilateral switch
  • (C)  3 terminal bilateral switch
  • (D)  3 terminal bidirectional switch
Submitted By :Ali Uppal


The function of snubber circuit connected across the SCR is to___________?

  • (A)  Suppress dV / dt.
  • (B)  Increase dV / dt.
  • (C)  Decrease dV / dt.
  • (D)  Decrease di / dt.
Submitted By :Ali Uppal


Submitted By :Ali Uppal


In forward blocking mode of a thyristor________?

  • (A)  junction J2 is in reverse bias and J1, J3 is in forward bias.
  • (B)  junction J3 is in forward bias and J1, J2 is in reverse bias.
  • (C)  Junction J1, J3 is in reverse bias and J2 is in forward bias.
  • (D)  Junction J1 and J2 is in forward bias and J3 is in reverse bias.
Submitted By :Ali Uppal