5555555555
20. A silicon power transistor is operated with a heat sink ( θSA = 1.5ºC/W). The transistor, rated at 150 W (25ºC), has θJC = 0.5º C/W, and the mounting insulation has θCS = 0.6 ºC/W. What is the maximum power that can be dissipated if the ambient temperature is 50ºC and TJmax = 200 ºC?
(a) 61.5 W
(b) 60.0 W
(c) 57.7 W
(d) 55.5 W
| Subject Name : Electronics Engineering |
| Exam Name : IIT GATE, UPSC ESE, RRB, SSC, DMRC, NMRC, BSNL, DRDO, ISRO, BARC, NIELIT |
| Posts Name : Assistant Engineer, Management Trainee, Junior Engineer, Technical Assistant |
| Electronics & Communication Engineering Books
|
| GATE 2023 Total Info | ENGG DIPLOMA | UGC NET Total Info |
| IES 2023 Total Info | PSUs 2022 Total Info | CSIR UGC NET Total Info |
| JAM 2023 Total Info | M TECH 2023 Total Info | RAILWAY 2022 Total Info |
Related Posts
555555555559. What is the maximum temperature rating for silicon power transistors? (a) 50º to 80º (b) 100º to 110º (c) 150º to 200º (d) 250º to 300º- 555555555585. The ________ has the hottest temperature in a power transistor. (a) heat sink (b) case (c) junction (d) None of the above
- 555555555554. Determine what maximum dissipation will be allowed for a 70-W silicon transistor (rated at 25ºC) if derating is required above 25ºC by a derating factor of 0.6 W/ºC at a case temperature of 100º. (a) 25 W (b) 30 W (c) 35 W (d) 40 W
- 555555555518. Class D operation can achieve power efficiency of over ________. (a) 90% (b) 78.5% (c) 50% (d) 25%
- 555555555562. The maximum efficiency of a transformer-coupled class A amplifier is ________. (a) 25% (b) 50% (c) 78.5% (d) 63.6%