A. R and C in series but with diode across C
B. R and C in series but with diode across R
C. Series R and diode with C across R
D. Series R and diode with C across R
Related Mcqs:
- Dynamic equalising circuit is useful____________?
A. To limit di / dt of SCR
B. To limit dV / dt of SCR
C. For voltage equalisation
D. Both B and C - A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be_____________?
A. 5, 7
B. 4, 6
C. 7, 5
D. 6, 4 - Dynamic equalizing circuit is used for________________?
A. equal division of voltage across each thyristor
B. equal division of current through each thyristor in parallel
C. equal division of voltage across each thyristor in parallel
D. equal division of current through each thyristor in series - 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. - Practical way of obtaining static voltage equalization in series connected SCRs is by the use of____________?
A. One resistor across the string
B. Resistors of the same value across each SCR
C. Resistors of different values across each SCR
D. One resistor in series with each SCR - 60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is______________________?
A. 76.3 %
B. 91.6 %
C. 83.3 %
D. 90.9 % - Gate circuit or triggering circuit of a thyristor is
A. lower power circuit.
B. high power circuit.
C. magnetic circuit.
D. may be low power or high power circuit - The sum of all phase current in a star connected primary winding with no neutral connection is equal to___________?
A. Phase current
B. Three times the phase current
C. Three times the line current
D. Zero at all times - For commutation in three phase PAC, normally balanced three phase voltages VR, VY and VB are connected to the three legs of the converter via______________?
A. Three inductances
B. Three capacitances
C. Three resistance
D. Three transistors - COOLMOS device can be used in application up to power range of___________?
A. 1 KVA
B. 2 KVA
C. 500 VA
D. 100 KVA
