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