MCQ
2521. 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
2522. An SCR is made of---
Germanium
Carbon
Silicon
None of the above
2523. ইলেকট্রনিক্স কাজের জন্য আদর্শ সোল্ডারিং হলো-
25 watt
40 watt
30 watt
60 watt
2524. অপরিবাহীর এনার্জি গ্যাপ প্রায়-
15 eV
10 eV
0.7 eV
7 eV
2525. An SCR has three terminals viz-
anode, cathode, grid
cathode, anode, gate
anode, cathode, drain
none of the above
2526. 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
2527. An SCR is a --triggered device.
Voltage
current
Voltage as well as current
None of the above
2528. 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
2529. If firing angle is increased, then the output of an SCR-
Remains the same
Is increased
Is decreased
None of the above
2530. An SCR is made of silicon and not germanium because silicon-
is inexpensive
is mechanically strong
has small leakage current
is tetravalent
2531. ফিন্টারের আউটপুট থেকে পাওয়া যায়-
পিউর ডিসি
পালসেটিং ডিসি
পিউর এসি
এসি
2532. When SCR starts conducting, which loses all control?
Cathode
Anode
Gate
None of the above
2533. 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.
2534. What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150V source?
9.7 Ω
97 Ω
23 Ω
230 Ω
2535. An SCR is also known as---
Triac
Diac
Unijunction transistor
Thyristor
2536. An SCR is a solid state equivalent of-
Triode
Gas-filled triode
Pentode
Tetrod
2537. If the temperature of the diode increases, then leakage current-
Remains same
Increases
Decreases
Becomes zero
2538. In an SCR circuit, the generally --that of breakover voltage.
Equal to
Greater than
Less than
None of the above
2539. The parallel combination of a 470 Ω resistor and a 680 Ω resistor is in series resistors with the parallel combination of four 2k Ω The total resistance is-
1.650 Ω
1.0782 Ω
77.8Ω
778 Ω
2540. An SCR behaves as a—switch.
Unidirectional
Mechanical
Bidirectional
None