A thyristor has a maximum allowable junction temperature of 120°C and the ambient temperature is 40°C. If thermal resistance is 1.6° C/W, the maximum allowable internal power dissipation is
Answer: B
No answer description available for this question.
Enter details here
A DIAC has two terminals, anode and cathode.
Answer: B
They are designated as T1 and T2 because diac can conduct in both directions.
Enter details here
A single phase semiconverter is feeding a highly inductive load. The circuit has a freewheeling diode across the load and firing angle is a. During one cycle of input voltage, the total duration of conduction of freewheeling diode is
Answer: B
Freewheeling diode conducts for a° in each half cycle.
Enter details here
In single phase half wave regulator, the average current over one full cycle
Answer: D
The input current during positive half cycle is less than that during negative half cycle.
Enter details here
A Shockley diode can be used
Answer: B
It is a four layered PNPN device without a gate terminal. Its characteristics is similar to that of SCR with zero gate current. It is acting as a trigger switch for Thyristor.
Enter details here
The number of leads in a power semiconductor diode are
Answer: A
A diode has 2 leads irrespective of its rating.
Enter details here
A thyristor has a turn on time of 6 μs. If the anode circuit is inductive, the turn on time will be
Answer: C
Inductive load increases the turn on time.
Enter details here
When thyristors are connected in series and parallel, it may be necessary to have :
Answer: C
Thyristors in series do not share the voltage equally and require voltage derating. Thyristors in parallel need current derating.
Enter details here
The dynamic equalising circuit consists of a series combination of capacitor C and resistor RC across each thyristor. This resistance RC (along with parallel connected diode)
Answer: B
Discharge current flows through Re .
Enter details here
A semi converter operates in two quadrants.
Answer: B
It operates only in quadrant.
Enter details here