MCQ
1. ক্লাস 'ডি' অ্যামপ্লিফায়ারের কর্মদক্ষতা-
25%
50%
90%
60%
2. অপরিবাহীর এনার্জি গ্যাপ প্রায়-
15 eV
10 eV
0.7 eV
7 eV
3. ইলেকট্রনিক্স কাজের জন্য আদর্শ সোল্ডারিং হলো-
25 watt
40 watt
30 watt
60 watt
4. ABC-এর মান-
A ̅.B ̅.A ̅
A ̅+B ̅+C ̅
(AB) ̅+C ̅
(AB) ̅+C ̅
5. An SCR is made of silicon and not germanium because silicon-
is inexpensive
is mechanically strong
has small leakage current
is tetravalent
6. In an SCR circuit, the angle of conduction can be changed by-
Changing anode voltage.
Changing gate voltage.
Reverse biasing the gate.
None of the above
7. An SCR behaves as a—switch.
Unidirectional
Mechanical
Bidirectional
None
8. ফিন্টারের আউটপুট থেকে পাওয়া যায়-
পিউর ডিসি
পালসেটিং ডিসি
পিউর এসি
এসি
9. An SCR is a solid state equivalent of-
Triode
Gas-filled triode
Pentode
Tetrod
10. স্ট্যাবিলিটি ফ্যাক্টরের আদর্শ মান--
200
1
100
500
11. When SCR starts conducting, which loses all control?
Cathode
Anode
Gate
None of the above
12. PCB-এর ফুল মিনিং-
Pakistan Cricket Board
Printed Circuit Board
Painted Crossed Board
কোনোটিই নয়
13. If gate current is increased, then anode-cathode voltage at which SCR turns ON-
is decreased
remains the same
is increased
none of the above
14. An SCR has three terminals viz-
anode, cathode, grid
cathode, anode, gate
anode, cathode, drain
none of the above
15. AC power in a load can be controlled by connecting-
Two SCRs in series
Two SCRs in parallel
Two SCRs in parallel opposition
None of the above
16. An SCR is turned off when-
Anode current is reduced to zero.
Gate voltage is reduced to zero.
Gate is reverse biased.
None of the above.
17. If firing angle is increased, then the output of an SCR-
Remains the same
Is increased
Is decreased
None of the above
18. An SCR is also known as---
Triac
Diac
Unijunction transistor
Thyristor
19. --এ সূচনা বিন্দু (Operating point) সবচেয়ে বেশি স্থির থাকে।
ভোল্টেজ বিভাজিত (Divider) বায়াসিং
বেস-রোধ বায়াসিং
কালেক্টর-রোধ বায়াসিং
শূন্য বায়াসিং
20. An SCR is made of---
Germanium
Carbon
Silicon
None of the above