| Que.
1 |
A cascade amplifier stage is equalent to |
| A |
|
a comman emittor stage followed by a common base stage |
| B |
|
a comman base stage followed by a common emittor stage |
| C |
|
a common base stage followed by an emittor follower |
| 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 |
|
R (b)<< B R(c) |
| B |
|
(D)R < or = B R(c) |
| C |
|
(D)R(b) < or = B R |
| D |
|
R(b) < or = B R(c) |
|
| Que.
3 |
Input resistance of a common base transistor ckt is of the order of |
| A |
|
0The output resistance of a common base transistor ckt is of
the order of |
| B |
|
50-100 ohm |
| C |
|
100-150 ohm |
| 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 |
|
4 |
| B |
|
3 |
| C |
|
2 |
| D |
|
1 |
|
| Que.
5 |
Maximum efficiency of half wave rectifier is |
| A |
|
33.33% |
| B |
|
40.6% |
| C |
|
50% |
| 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 |
|
10v |
| B |
|
14v |
| C |
|
20v |
| 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 |
|
20PF |
| B |
|
10PF |
| C |
|
3.2PF |
| D |
|
1.6PF |
|
| Que.
8 |
When a +ve gate voltage is applied to MOSFET it is said to operate in |
| A |
|
enhancement mode |
| B |
|
depletion mode |
| C |
|
conduction mode |
| D |
|
none of these |
|
| Que.
9 |
the tunned ckt for good stability should have |
| A |
|
low C |
| B |
|
low r |
| C |
|
high Q |
| D |
|
low L |
|
| Que.
10 |
by varying which one of the following the RR feedback oscillator are usually
tunned |
| A |
|
load impedance |
| B |
|
bras |
| C |
|
lore |
| 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 |
|
100v |
| B |
|
50/(pi)^v |
| C |
|
10v |
| D |
|
5v |
|
| Que.
12 |
the number of flipflop required to build a mod-15 counters is |
| A |
|
4 |
| B |
|
5 |
| C |
|
6 |
| D |
|
7 |
