Electronics within you!!
Note: 1. ALL QUESTIONS ARE COMPULSARY . maximum marks:100
2.NO Negative Marking 3.Each Question Carries 2 Marks
Name: rollno: branch: year:
Note: 1. ALL QUESTIONS ARE COMPULSARY . maximum marks:100
2.NO Negative Marking 3.Each Question Carries 2 Marks
Name: rollno: branch: year:
1. Which is not a "common" value of resistance: a)2k7 b)4k4 c)1m8 d)330R 3. The four symbols are:
a) Capacitor,
Microphone, Potentiometer, Electrolytic
b)
Electrolytic, Microphone, Resistor, Capacitor
c)
Capacitor, Piezo, Resistor, Electrolytic
d) Electrolytic,
Coil, Resistor, Capacitor
5. 223 on a capacitor represents:
a) 0.022u u = microfarad
b) 220n n
= nanofarad
c) 22,000p p = picofarad
d) All of the above
7. Identify the correctly connected LED:a)A b)B c)C d)D 9. The number 0000(ignore carry) would appear just immediately after (a) FFFF (hex) (b) 1111 (binary) (c) 7777 (octal) (d) All of the above. 11.what is the frequency of a clock waveform if the period of the wave form is 1.5 us? a) 8khz b)0.8 khz c) 0.8 mhz d)8mhz 13.The .................ensures the only one IC is active at a time to avoid a conflict caused by two IC’s writing different data to the same bus. a)Control bus b) control instructions c)Address decoder d)CPU 15.A basic multiplexer can be demonstrated through the use of a a)Single pole relay b) DPDT Switch c)Rotatory Switch d)Linear stepper
17.It
is required to construct a counter to count upto 100(decimal). The minimum
number of flipflops
required to construct the counter
is
(A)
8 (B)
7 (C)
6 (D)
5
18.As a general rule for a stable Flip-Flop triggering,the clock
pulse rise and fall times must be:
a)very long
b)
very short
c)at
a maximum value to enable the input control signals to stabilize.
d)of
no consequence.
19.What type of circuit is used at the interface point of an
output port in the microprocessor?
a)decoder b)latch
c)tri –State Buffer d)none
21.The input/output relationship of the common –collector and
common-base amplifiers is:
a)
270 degree b)180 degree c)90 degree d)0 degree
23.The voltage where current may start to flow in
a reverse-biased pn junction is called the
a) breakdown voltage
b)barrier potential
c)forward voltage
d)biasing voltage
a)
22R 270k 2k2 1M b)
4k7 10k 47R 330k
c)
3R3 4R7 22R 5k6 d)
100R 10k 1M 3k3
27. The
control terminal (pin5) of 555 timer IC is normally connected to ground
through a capacitor
(~ 0.01μF). This is to
(A)
protect the IC from inadvertent application of high voltage
(B)
prevent false triggering by noise coupled onto the pin
(C)
convert the trigger input to sharp pulse by differentiation
(D)
suppress any negative triggering pulse
32.in 8051 microcontroller The contents
of the accumulator after this operationMOV A,#0BH ANL A,#2CH will be a) 11010111 b) 11011010 c) 00001000 d) 00101000
36. channel current
is reduces on application of a more positive voltage to the GATE of the
depletion mode
n-channel MOSFET (true/false)
37.. Which of the
following effects can be caused by a rise in temperature
a. Increase in MOSFET current
(IDS) b. decrease
and then Increase in BJT current (IC)
c. Decrease in MOSFET current
(IDS) d. increase and
then Decrease in BJT current (IC)
38.
This figure is a schematic representation of a/an:
A.
differential amplifier. B.
inverting amplifier.
C.
noninverting amplifier. D. voltage
follower.41. A red-red-red-gold resistor in series with an orange-orange-orange-gold resistor produces: 5k5 35,200 ohms 55k None of the above 43. The signal at the collector will be . . . with the base. Inverted . . . In-phase . . . C)no output d)none of these 44.What does ‘0L’or ‘1’ on a digital multimeter stands for?? A: A Open Circuit B: A Closed Circuit C: Inductance D: None of these 45. What value does hFE on a digital multimeter represent? A: Voltage Gain B: Current Gain C: ‘Beta’ value of the transistor D: ‘alpha’ value of the transistor 46. On the transistor chip BC 547,what does B stands for? A: A silicon made transistor B: A germanium made transistor C: A High Power Transistor D: A Low frequency Transistor
49. In an intrinsic semiconductor, the Fermi-level is
(A)
closer to the valence band
(B) midway between
conduction and valence band
(C)
closer to the conduction band
(D) within the valence
band
|
2. The
resistor identified in brown is called the: a)Base bias resistor
b)Load resistor
c)Emmiter feedback resistor
d)Bypass Resistor
a) To pass AC on the input to the base.
b) To allow the
transistor to self-bias
d) To allow the stage to operatec) Block DC from the input line 6. A capacitor and coil in parallel is called:
a)Tuned circuit
b)A Timing circuit
c)A delay circuit
d)A Schmit circuit
10111101 A: 675 B: 275 C: 572 D: 573
10.The following waveform pattern is for a(n) ________.
a)2 input AND gate
b)2 input OR gate
c)Exclusive-OR gate d)none of these
12.In a
16-bit microprocessor, words are stored in two consecutive memory locations.
The entire word can be read in one operation provided the first
(a) word is even (b)
word is odd
(c) memory location is
odd (d) memory address is even
14.The
technique of assigning a memory address to each I/O device in the computer system is
called:
a) memory mapped I/O b)Ported I/O
c)dedicated I/O d)Wired I/O
16.The
............ is defined as the time the output is active divided by the total
period of the output signal.
a)On time b)Off
time c)Duty cycle d)Active ratio
20.when
transistors are used in digital circuits the usually operate in the:
a)active
region
b)breakdown region
c)saturation and cutoff region
d)Linear region
22.The dc current through each diode in a bridge
rectifier equals:
a)the load current
b)half the dc load current
c)twice the dc load
d)one fourth the dc load
24.. If the voltage on the base of
a transistor increases, does it:
a)Turn On b)Turn Off c)Not enough information
d)Remain the same
a)Pulse circuit
b)Timing/Delay circuit
c)Oscillator Circuit/Frequency Circuit
d)Schmitt Circuit
28. Technician A says that LED-1 will be ON and
LED-2 will be OFF when the circuit is connected as shown below. Technician B
says that both LED-1 and LED-2 will be ON when the circuit is connected as
shown below. Who is correct? :
a)technician A only. b)technician B only
.
c)neither Tech A nor Tech B. d) Technician A nor Technician B
29.
In an
intrinsic semiconductor, the Fermi-level is
(A)
closer to the valence band (B) midway
between conduction and valence band
(C)
closer to the conduction band
(D) within the valence
band
30. The dual of the Boolean expression: x + y + z is
(A)
x .y + z (B) x
+ yz
(C) x . y . z (D) x.y.z
31.
The type of
power amplifier which exhibits crossover distortion in its output is
(A)
Class A (B)
Class B (C)
Class AB (D)
Class C
33.
Zener diodes are most
commonly used in:
A.
voltage amplifier circuits.
B. oscillator circuits.
C. power supply circuits. D. current limiting circuits
34.A resistor with colour bands Red, Violet, Green and Black will have a
value
(A)27 K±10%K (B)2.7 M±20% K (C)270 K±5% K (D)2.7 K±2%K
35.The following data refers to an experiment
carried out on a Zener diode:
The Zener voltage
will be between:
(a) 1 V and 2 V
(b) 2 V and 3 V (c) 3 V and 4 V
(d)none of these
39. What
is the approximate characteristic voltage that develops
across a red LED? a)1.7 V b)3.4V c)0.6V d)5V Base Bias Resistor Load Resistor Emitter Feedback Resistor Bypass Resistor 42. Name the 4 components: Photo darlington transistor, switch, capacitor, coil Transistor, mercury switch, piezo, coil Photo transistor, reed switch, piezo, coil Photo darlington transistor, reed switch, piezo, coil
47: A
minterm of the Boolean-function, f(x, y, x) is
(A
x¢ + y + z (B) x
y z¢ (C)
x z (D)
(y +z) x
48.Space charge region around a p-n junction
(A)
does not contain mobile carriers
(B)
contains both free electrons and holes
(C)
contains one type of mobile carriers depending on the level of
doping of the p or n regions
(D) contains electrons only as free carriers
50. The gate that assumes the 1 state, if and only if the input
does not take a 1 state is
called________.
(A)
AND gate (B)
NOT gate
(C) NOR
gate (D)
Both (B) & (C)
|
Answer:
1-d, 2-b
3-a 4-c 5-c 6-a 7-b 8-b 9-d 10-b 11-c 12-d 13-c 14-a 15-c 16-c 17-a
18-b 19-b 20-c 21-d 22-a 23-a 24-c 25-c 26-b
27-b 28-a 29-c
30-c 31-b 32-c
33-c 34-b
35-b 36-b37-c 38-d
39-a 40-a 41-b 42-d 43-a 44-a 45-b 46-a
47-b 48-a 49-c
50-d
for exciting mini project http://electrofb.blogspot.in/2014/02/70w-inverter.html
for exciting mini project http://electrofb.blogspot.in/2014/02/70w-inverter.html
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