Image
1.0.0
MCQ
2541. The point of intersection of de and ac load lines is called-
saturation
operating
cut off
none of these
2542. 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
2543. 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
2544. A zener diode is destroyed if it-
is forward biased
is reverse biased
carriers more than rated current
none of the above
2545. An SCR has-semiconductor layers.
Two
Three
Four
None of the above
2546. The reverse current in a diode is of the order of—
KA
A
mA
uA
2547. 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
2548. Which causes the barrier layer in a PN Junction--
doping
barrier potential
recombination
ions
2549. 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
2550. 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
2551. An SCR has PN junctions.
Two
Four
Three
None of the above
2552. 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.
2553. In the normal operation of an SCR, anode is-- with respect to cathode.
at zero potential
negative
positive
none of the above
2554. For highest power gain, one would use-- configuration.
CE
CB
CC
none of these
ব্যাখ্যা: For highest power gain, CE configuration is used. In CE configuration, biasing capacitor is used to balance the operating point to obtain highest power gain
2555. 1 db corresponds to --- changes in voltage level.
12%
20%
80%
26%
2556. RC coupling is used for---amplification.
voltage
power
current
none
2557. The most commonly used semiconductor is-
germanium
carbon
sulphur
silicon
2558. Transistor biasing represents --conditions.
ac
both ac & dc
dc
none
2559. 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
2560. A PN junction acts as a--
unidirectional switch
bidirectional switch
controlled switch
none of the above
ব্যাখ্যা: The PN junction is conduct with forward bias only. It means they conduct in only one direction (Current flows from P to N) That's why PN Junction acts as unidirectional twitch