Image
1.0.0
MCQ
2541. RC coupling is used for---amplification.
voltage
power
current
none
2542. 1 db corresponds to --- changes in voltage level.
12%
20%
80%
26%
2543. 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
2544. When transistor is used as an amplifier, it is operated in the:
Cut off region
Saturation region
Active region
Both a and b
2545. If a power supply has no-load and full-load voltages of 30V and 25V respectively, then the percentage voltage regulation is:
10%
20%
15%
25%
2546. 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
2547. In an LC oscillator, the frequency of oscillation is:
Proportional to LC
Proportional to square root of LC
Inversely proportional to the square root of LC
Independent of the value of LC
2548. 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
2549. The most commonly used semiconductor is-
germanium
carbon
sulphur
silicon
2550. Which causes the barrier layer in a PN Junction--
doping
barrier potential
recombination
ions
2551. 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
2552. Transistor biasing represents --conditions.
ac
both ac & dc
dc
none
2553. 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
2554. A zener diode is destroyed if it-
is forward biased
is reverse biased
carriers more than rated current
none of the above
2555. 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
2556. The point of intersection of de and ac load lines is called-
saturation
operating
cut off
none of these
2557. In the normal operation of an SCR, anode is-- with respect to cathode.
at zero potential
negative
positive
none of the above
2558. The reverse current in a diode is of the order of—
KA
A
mA
uA
2559. The maximum efficiency of a half-wave diode rectifier is --
50%
25%
40.0%
81.2%
2560. 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.