| Que.
1 |
A cascade amplifier stage is equalent to |
| A |
< value="ON" name="10_A" =""> |
a comman emittor stage followed by a common base stage |
| B |
< value="ON" name="10_B" =""> |
a comman base stage followed by a common emittor stage |
| C |
< value="ON" name="10_C" =""> |
a common base stage followed by an emittor follower |
| D |
< value="ON" name="10_D" =""> |
an emittor follower stage followed by a common base stage |
|
| Que.
2 |
In order to make Q point independent and varitions B in a transistor amplifier,it
is necessary to make |
| A |
< value="ON" name="24_A" =""> |
R (b)<< B R(c) |
| B |
< value="ON" name="24_B" =""> |
(D)R < or = B R(c) |
| C |
< value="ON" name="24_C" =""> |
(D)R(b) < or = B R |
| D |
< value="ON" name="24_D" =""> |
R(b) < or = B R(c) |
|
| Que.
3 |
Input resistance of a common base transistor ckt is of the order of |
| A |
< value="ON" name="46_A" =""> |
0The output resistance of a common base transistor ckt is of
the order of |
| B |
< value="ON" name="46_B" =""> |
50-100 ohm |
| C |
< value="ON" name="46_C" =""> |
100-150 ohm |
| D |
< value="ON" name="46_D" =""> |
150-200 ohm |
|
| Que.
4 |
The emitter coupled pair of BJTs gives a linear transfer relation between
the differential output voltage and input voltage only when the magnitude
of V(id) is less alpha times the thermal voltage, where alpha is |
| A |
< value="ON" name="18_A" =""> |
4 |
| B |
< value="ON" name="18_B" =""> |
3 |
| C |
< value="ON" name="18_C" =""> |
2 |
| D |
< value="ON" name="18_D" =""> |
1 |
|
| Que.
5 |
Maximum efficiency of half wave rectifier is |
| A |
< value="ON" name="27_A" =""> |
33.33% |
| B |
< value="ON" name="27_B" =""> |
40.6% |
| C |
< value="ON" name="27_C" =""> |
50% |
| D |
< value="ON" name="27_D" =""> |
68% |
|
| Que.
6 |
If the input ac is 10Vrms the maximum voltage that will appear across
the diode of a half wave rectifier with a capacitor input filter will
be |
| A |
< value="ON" name="33_A" =""> |
10v |
| B |
< value="ON" name="33_B" =""> |
14v |
| C |
< value="ON" name="33_C" =""> |
20v |
| D |
< value="ON" name="33_D" =""> |
28v |
|
| Que.
7 |
The three stage cascaded amplifier of identical non-interacting FET common
source stage has all over an voltage gain of 1000 and overall bandwidth
of 25*10^6rad/sec given g(m) =5mA/v the shunt capacitance of each stage
is given by |
| A |
< value="ON" name="38_A" =""> |
20PF |
| B |
< value="ON" name="38_B" =""> |
10PF |
| C |
< value="ON" name="38_C" =""> |
3.2PF |
| D |
< value="ON" name="38_D" =""> |
1.6PF |
|
| Que.
8 |
When a +ve gate voltage is applied to MOSFET it is said to operate in |
| A |
< value="ON" name="58_A" =""> |
enhancement mode |
| B |
< value="ON" name="58_B" =""> |
depletion mode |
| C |
< value="ON" name="58_C" =""> |
conduction mode |
| D |
< value="ON" name="58_D" =""> |
none of these |
|
| Que.
9 |
the tunned ckt for good stability should have |
| A |
< value="ON" name="67_A" =""> |
low C |
| B |
< value="ON" name="67_B" =""> |
low r |
| C |
< value="ON" name="67_C" =""> |
high Q |
| D |
< value="ON" name="67_D" =""> |
low L |
|
| Que.
10 |
by varying which one of the following the RR feedback oscillator are usually
tunned |
| A |
< value="ON" name="68_A" =""> |
load impedance |
| B |
< value="ON" name="68_B" =""> |
bras |
| C |
< value="ON" name="68_C" =""> |
lore |
| D |
< value="ON" name="68_D" =""> |
none of these |
|
| Que.
11 |
An operational amplifier has a slow rate of 100V/micre sec. for a freq.
of 10mhz the maximum value of the sine wave output voltage will be |
| A |
< value="ON" name="78_A" =""> |
100v |
| B |
< value="ON" name="78_B" =""> |
50/(pi)^v |
| C |
< value="ON" name="78_C" =""> |
10v |
| D |
< value="ON" name="78_D" =""> |
5v |
|
| Que.
12 |
the number of flipflop required to build a mod-15 counters is |
| A |
< value="ON" name="129_A" =""> |
4 |
| B |
< value="ON" name="129_B" =""> |
5 |
| C |
< value="ON" name="129_C" =""> |
6 |
| D |
< value="ON" name="129_D" =""> |
7 |
|
| Que.
13 |
The maximum overall efficiency of a transformer coupled class A amplifier
is |
| A |
< value="ON" name="99_A" =""> |
78.5% |
| B |
< value="ON" name="99_B" =""> |
25% |
| C |
< value="ON" name="99_C" =""> |
50% |
| D |
< value="ON" name="99_D" =""> |
85% |
|
| Que.
14 |
In an FET as V(GS) is changed from zero to increasing reverse biased the
value of g(m) |
| A |
< value="ON" name="108_A" =""> |
increases |
| B |
< value="ON" name="108_B" =""> |
decreases |
| C |
< value="ON" name="108_C" =""> |
remain constant |
| D |
< value="ON" name="108_D" =""> |
falls suddenly to zero |
|
| Que.
15 |
given for an FET g(m) =95mA/v total capacitance =500pf for a voltage
gain of -30 the bandwidth will be |
| A |
< value="ON" name="109_A" =""> |
100khz |
| B |
< value="ON" name="109_B" =""> |
630khz |
| C |
< value="ON" name="109_C" =""> |
3mhz |
| D |
< value="ON" name="109_D" =""> |
19mhz |
|
| Que.
16 |
for the resonent ckt shows w =10^5,Q=50,R=400 thevalue of C is given by |
| A |
< value="ON" name="116_A" =""> |
250PF |
| B |
< value="ON" name="116_B" =""> |
1000PF |
| C |
< value="ON" name="116_C" =""> |
500PF |
| D |
< value="ON" name="116_D" =""> |
1.25PF |
|
| Que.
17 |
In a class A amplifierusing a transistor under ideal condition the maximum
ac power delivered is 1 watt the maximum transistor dissipation capability
has to be |
| A |
< value="ON" name="121_A" =""> |
1watt |
| B |
< value="ON" name="121_B" =""> |
2watt |
| C |
< value="ON" name="121_C" =""> |
3watt |
| D |
< value="ON" name="121_D" =""> |
4watt |
|
| Que.
18 |
two binary signals A and B are compared the output expression when the
two signals are equal is given by |
| A |
< value="ON" name="122_A" =""> |
ab' +a'b |
| B |
< value="ON" name="122_B" =""> |
ab + (ab)' |
| C |
< value="ON" name="122_C" =""> |
(ab)' |
| D |
< value="ON" name="122_D" =""> |
ab |
|
| Que.
19 |
the most widely used universal gate are |
| A |
< value="ON" name="123_A" =""> |
OR and AND gates |
| B |
< value="ON" name="123_B" =""> |
NOR and NAND gates |
| C |
< value="ON" name="123_C" =""> |
NOR and AND gates |
| D |
< value="ON" name="123_D" =""> |
NAND and OR gates |
|
| Que.
20 |
the microprocessor contains ROM chip contains? |
| A |
< value="ON" name="165_A" =""> |
control function |
| B |
< value="ON" name="165_B" =""> |
airthmatic function |
| C |
< value="ON" name="165_C" =""> |
instructions to execute data |
| D |
< value="ON" name="165_D" =""> |
memory function |
|