ELECTRONICS QUESTION

computer Q&A                                  G.S one line approch

In the common mode, ……………
Q1. In the common mode, ……………
1.   both inputs are grounded
2.   the outputs are connected together
3.   an identical signal appears on both the inputs
4.   the output signal are in-phase
Answer : 3
Q2. The common-mode gain is ………..
1.   very high
2.   very low
3.   always unity
4.   unpredictable
Answer : 2
Q3. The differential gain is ………
1.   very high
2.   very low
3.   dependent on input voltage
4.   about 100
Answer : 1
Q4. If ADM = 3500 and ACM = 0.35, the CMRR is ……….
1.   1225
2.   10,000
3.   80 dB
4.   answers (2) and (3)
Answer : 4
Q5. For an Op-amp with negative feedback, the output is …….
1.   equal to the input
2.   increased
3.   fed back to the inverting input
4.   fed back to the noninverting input
Answer : 3
Q6. Negative feedback ………..
1.   increases the input and output impedances
2.   increases the input impedance and bandwidth
3.   decreases the output impedance and bandwidth
4.   does not affect impedance or bandwidth
Answer : 2
Q7. The Op-amp can amplify
1.   a.c. signals only
2.   d.c. signals only
3.   both a.c. and d.c. signals
4.   neither d.c. nor a.c. signals
Answer : 3
Q8. The input offset current equals the ……….
1.   difference between two base currents
2.   average of two base currents
3.   collector current divided by current gain
4.   none of these
Answer : 1
Q9. The node voltage at the top of the til resistor is closes to ……….
1.   collector supply voltage
2.   zero
3.   emitter supply voltage
4.   tail current times base resistance
Answer : 2
Q10. The tail current in a differential amplifier equals …….
1.   difference between two emitter currents
2.   sum of two emitter currents
3.   collector current divided by current gain
4.   collector voltage divided by collector resistance
Answer : 2
Q11. In a transistor having normal bias, the emitter junction
 (a) has a high resistance. (b) has a low resistance. (c) is reverse biased. (d) emits carriers into base region.
ANSWER-B

Que12-
When transistors are used in digital circuits they usually operate in the:
A.
active region
B.
breakdown region
C.
saturation and cutoff regions
D.
linear region
Answer: Option C
. 
Que13-A current ratio of IC/IE is usually less than one and is called:
A.
beta
B.
theta
C.
alpha
D.
omega
Answer: Option C

Q 
14 With the positive probe on an NPN base, an ohmmeter reading between the other transistor terminals should be:
A.
open
B.
infinite
C.
low resistance
D.
high resistance
Answer: Option C


Que15-  In a C-E configuration, an emitter resistor is used for:
A.
stabilization
B.
ac signal bypass
C.
collector bias
D.
higher gain
Answer: Option A
  Que16 -To operate properly, a transistor's base-emitter junction must be forward biased with reverse bias applied to which junction?
A.
collector-emitter
B.
base-collector
C.
base-emitter
D.
collector-base
Answer: Option D
Que17-The C-B configuration is used to provide which type of gain?
A.
voltage
B.
current
C.
resistance
D.
power
Answer: Option A
 Que18-
A transistor may be used as a switching device or as a:
A.
fixed resistor
B.
tuning device
C.
rectifier
D.
variable resistor
Answer: Option D

Que19-The input/output relationship of the common-collector and common-base amplifiers is:
A.
270 degrees
B.
180 degrees
C.
90 degrees
D.
0 degrees
Answer: Option D

Que20-If a transistor operates at the middle of the dc load line, a decrease in the current gain will move the Q point:
A.
off the load line
B.
nowhere
C.
up
D.
down
Answer: Option D


Que21-Which is the higher gain provided by a C-E configuration?
A.
voltage
B.
current
C.
resistance
D.
power
Answer: Option D

QUE
22 -The center frequency of a band-pass filter is always equal to the
A.
bandwidth
B.
–3 dB frequency
C.
bandwidth divided by Q
D.
geometric average of the critical frequencies
Answer: Option D