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_____________?
Correct answer: C. 7, 5
- A. 5, 7
- B. 4, 6
- C. 7, 5
- D. 6, 4
Explanation
The required series count is 11/(1.8 × 0.9) = 6.79, so 7 SCRs are needed in series. The parallel count is 4/(1 × 0.9) = 4.44, so 5 parallel paths are required.
Last updated
Practise Power Electronics
253 free Power Electronics MCQs from Electrical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Electrical Engineering questions like this
Electrical Engineering is on 2 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
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 capacitive load in voltage source inverters generates ________________?
A carrier based PWM technique in CSI is composed of____________?
A combination of synchronized leading edge and trailing edge modulation has also been used to control a____________?
A commutating rectifier consists of commutator driven by___________?