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
A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. value of n will be___________?
(A) 60
(B) 70
(C) 80
(D) 90
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 %
If the gate voltage of an SCR is removed, then the_______________?
(A) anode current decreases
(B) anode current does not decrease at all
(C) anode current increases
(D) cathode current increases
Anode of an operational SCR is _______________?
(A) Always positive w.r.t cathode
(B) Always negative w.r.t anode
(C) Always positive w.r.t anode
(D) Always negative w.r.t cathode
An SCR is made up of silicon because?
(A) silicon has large leakage current than germanium
(B) silicon has small leakage current than germanium
(C) silicon has small leakage voltage than germanium
(D) silicon has large leakage voltage than germanium
In a silicon controlled rectifier, the load is connected___________?
(A) Across anode
(B) In series with anode
(C) Across cathode
(D) In series with cathode
AC power in a load can be controlled by using____________?
(A) Two SCR’s in parallel opposition
(B) Two SCR’s in series
(C) Three SCR’s in series
(D) Four SCR’s in series
The switching function of semiconductor devices can be characterized with___________?
(A) Duty ratio only
(B) Frequency only
(C) Duty ratio and frequency
(D) Duty ratio, frequency and time delay