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বেসিক ইলেকট্রনিক্স MCQ
ইলেকট্রনিক্স ডিপার্টমেন্টের বেসিক ইলেকট্রনিক্স সাবজেক্টের সকল MCQ প্রশ্ন এই ফোল্ডারে পাবেন। ইলেকট্রনিক্স ইঞ্জিনিয়ারিং এ চাকরি প্রস্তুতির জন্য ডিপার্টমেন্ট ও নন-ডিপার্টমেন্টের সকল MCQ ও আপডেট প্রশ্ন উত্তর সহ এই গ্রুপে পাবেন। ইঞ্জিনিয়ারিং চাকরি প্রস্তুতির জন্য আমাদের App: Engineering Classroom গুগল প্লে-স্টোর থেকে ডাউনলোড করে নিন।
21. An SCR is a --triggered device.
Voltage
current
Voltage as well as current
None of the above
22. If the temperature of the diode increases, then leakage current-
Remains same
Increases
Decreases
Becomes zero
23. An SCR has-semiconductor layers.
Two
Three
Four
None of the above
24. In an SCR circuit, the generally --that of breakover voltage.
Equal to
Greater than
Less than
None of the above
25. A zener diode is destroyed if it-
is forward biased
is reverse biased
carriers more than rated current
none of the above
26. Approximately how many milliamperes of current flow through circuit with a 40V source and 6.8 ΚΩ of resistance?
27.2 mA
5.9 mA
59 mA
590 mA
27. Which causes the barrier layer in a PN Junction--
doping
barrier potential
recombination
ions
28. The battery connections required to forword bias a pn junction are-
+ve terminal to p and -ve terminal to n
-ve terminal to pand+ ve terminal to n
-ve terminal to p and-ve terminal to n
+ve terminal to pand+ ve terminal to n
29. The purpose of a gate is to---
deliver molten metal into the mold cavity.
act as a reservoir for the molten metal.
feed the molten metal to the casting in order to compensate for the shrinkage.
deliver molten metal from pouring basin to gate
30. 1 db corresponds to --- changes in voltage level.
12%
20%
80%
26%
31. An SCR has PN junctions.
Two
Four
Three
None of the above
32. As the temperature of a transistor goes up the base-emitter resistance-
decreases
increases
remains the same
none
ব্যাখ্যা: As temperature increase, the thermal runway properly of transistor becomes more prominent and base-emitter resistance will decreases.
33. 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
34. Noise factor of a ideal amplifier is---
0dB
5dB
0.5dB
10dB
ব্যাখ্যা: There is no noise in a ideal amplifier. So, noise factor is 0 dB
35. The output frequency of a full wave rectifier is-
Same as the input frequency
One-half of the input frequency
Double of the input frequency
Independent of the input frequency
36. If the ac supply is 50Hz, what will be the ripple frequency out of the full wave rectifier?
50Hz
100Hz
60Hz
20Hz
37. A voltage divider consists of two 100k resistors and a 12V source. What will the output voltage be if a load resistor of 1 MQ is connected to the output?
0.57V
12V
5.7 V
6 V
38. 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
39. In the normal operation of an SCR, anode is-- with respect to cathode.
at zero potential
negative
positive
none of the above
40. The reverse current in a diode is of the order of—
KA
A
mA
uA