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WorksheetsDig the Digital
Total questions: 25
Worksheet time: 19mins
Name
Class
Date
1.
In an amplitude modulation system, the modulation index is dependent upon:
a)
Modulating frequency only
b)
Carrier amplitude only
c)
Modulating signal amplitude only
d)
Modulating and carrier amplitudes only
2.
If the carrier of a 100 percent modulated AM wave is suppressed the percentage power saving will be:
a)
50.62
b)
72.56
c)
85
d)
66.6
3.
In FM, the total transmitted power is
a)
. Dependent on modulating signal amplitude
b)
Dependent on modulating frequency
c)
Dependent on modulating index
d)
Independent of the above
4.
The transistor configuration which provides higher output impedance is
a)
CC
b)
CB
c)
CE
d)
None
5.
Why NPN transistor are preferred over PNP transistor
a)
NPN transistor have low heat dissipation
b)
NPN transistor can handle large power
c)
NPN transistor are cheap and easily available
d)
None
6.
The device which uses avalanche breakdown is
a)
PIN Ziode
b)
Zener Diode
c)
Impart Diode
d)
GUNN Diode
7.
The temperature coefficient of resistance of a resistor is
a)
Negitive
b)
Positive
c)
Zero
d)
None
8.
The output will be only if all inputs go to 1 in case of
a)
X
b)
Y
c)
Z
d)
X+Y+Z
9.
The Boolean function XYZ + YZ + XZ, after simplification gives
a)
OR GATE
b)
AND GATE
c)
NAND GATE
d)
NOT GATE
10.
. The process of extracting the audio information from the modulated envelope is called
a)
Modulation
b)
Detection
c)
Transmission
d)
Oscillation
11.
In which of the counter the clock input is common to all flip flops
a)
Asynchronous counter
b)
Synchronous counter
c)
Decade Counter
d)
Down Counter
12.
Carbon is not used as semiconductor because
a)
It does not belong to silicon group
b)
It is a good conductor
c)
It is not a conductor
d)
Band gap is very high
13.
Resistivity of silicon in ohms cm. is approx. equal to
a)
50K
b)
1012K
c)
230K
d)
10-6K
14.
The time constant of a RC network is given by
a)
RC
b)
C/R
c)
R/C
d)
None
15.
Hole is created in a semiconductor material if one of following impurities are added
a)
Antimony
b)
Arsenic
c)
Indium
d)
Phosphorus
16.
The silicon solar cell is a
a)
Photo conductive
b)
Photo emissive
c)
Photo voltaic
d)
Photo resistive
17.
A duplexer is used to
a)
Receive two signals in one antenna
b)
Prevent interference between two antenna
c)
Mix two signals to the same antenna
d)
. Allow one antenna for both transmission and reception
18.
. Noise generated by a resistor is dependent on
a)
Its Value
b)
Its temperature
c)
Both value and temp
d)
None
19.
A 100 MHz FM carrier, modulated by a 5 KHz sine wave deviates by 50 KHz
a)
Double
b)
Half
c)
Quadruple
d)
No Change
20.
Narrow bandwidth broadcast reduces
a)
The quality and noise
b)
Quality alone
c)
Noise alone
d)
Quality and intelligibility
21.
What are the individual values of two parallel resistors whose RT is 8 ohms, when one has double the resistance of the other?
a)
2.7 ohms and 5.3 ohms
b)
8 ohms and 16 ohms
c)
10 ohms and 20 ohms
d)
12 ohms and 24 ohms
22.
RTDs are typically connected with other fixed resistors
a)
in a pi configuration
b)
in a bridge configuration
c)
and variable resistors
d)
and capacitors in a filter-type circuit
23.
What type of device consists of a coil with a moveable iron core
a)
solenoid
b)
reed switch
c)
relay
d)
armature
24.
. When a magnet enters a coil and a voltage is induced, the process is known as:
a)
an alternation
b)
self-inductance
c)
counter emf
d)
flux linkage
25.
Reactance in an inductive circuit will:
a)
increase with frequency
b)
decrease with frequency
c)
be independent from frequency
d)
depend on the value of XC
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