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Which one is digital modulation technique? | |
A. | AM [Wrong Answer] |
B. | PAM [Wrong Answer] |
C. | PCM [Wrong Answer] |
D. | None [Correct Answer] |
View Answer
Explanation:-
Answer : D Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
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Linear circuits
Non-linear circuits
Lumped parameters circuits
Distributed parameters circuits
⇒ δ(t - b) is a pulse function.
TRUE
FALSE
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XYZ + X YZ + X Y Z
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X Y Z + XYZ + XY Z
XYZ + XYZ + XY Z
⇒ In 8085 microprocessor system, can an input and output port have same port address?
Yes
No
Insufficient data
None of these
⇒ Image frequency rejection mainly depends upon
detector
mixer
IF
RF
⇒ The resistance of a metallic wire would
increase as f increase
decrease as f increase
remains the same at all frequencies
increase with f up to a certain frequency and then decrease
⇒ Reciprocity theorem is applicable to
circuits with one source
circuits with only one independent source
circuits with any number of sources
circuits with any number of independent sources
⇒ Decimal 43 in hexadecimal and BCD number system is respectively.
B2, 01000011
2B, 01000011
2B, 00110100
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⇒ A 4 bit down counter starts counting from 1111 irrespective of modulus.
TRUE
FALSE
⇒ Which of the following frequencies has the greatest period?
20 Hz
200 Hz
20 kHz
200 kHz
⇒ A loss less line is terminated in a circular lines are E lines
SWR = 0
SWE = 0
SWR is finite
SWR = ∞
⇒ Eddy currents are essential for the deflecting torque of an induction wattmeter.
TRUE
FALSE
⇒ An RF carrier of 12 kV at 1 MHz is amplitude modulated by 1 kHz signal having peak value of 6 kV. The modulation pattern is seen on CRO screen. The voltage indicated will be
18 kV
1.001 kV
6 kV
36 kV
⇒ In a TWT the amplitude of resultant wave travelling down the helix
increases exponentially
increases linearly
decreases exponentially
is almost constant
⇒ Nyquist plot provides information about absolute stability as well as relative stability.
TRUE
FALSE
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bandwidth increases
the wave gets distorted
power of the wave increases
efficiency of transmission increases
⇒ Gauge factor of a strain gauge is
unit change in resistance per unit change in length
change in resistance per unit change in length
unit change in length per unit change in resistance
none of the above
⇒ In the circuit of figure, PIV can be u
E_{m}
2 E_{m}
0.5 E_{m}
2 E_{m}
⇒ TTL circuit with active pull up is preferred because of its suitability for
wired AND operation
bus operated system
wired logic operation
reasonable dissipation and speed of operation
⇒ The addition of p type impurity to intrinsic material creates allowable energy levels.
slightly below conduction band
slightly above conduction band
slightly below valence band
slightly above valence band
⇒ What does the instruction
'PCHL'
in 8085 do?Load the program counter with contents of register pair H L
Double the contents of register pair H L
Shift the contents of register pair H L by one bit to the right
Shift the contents of register pair H L by one bit to left
⇒ The signal in 8086 are in minimum mode when
MN / Mx pin is tied to V_{cc}
MN / Mx pin is grounded
MN / MX pin is left open
none of the above
⇒ When microprocessor processes both positive and negative numbers, the representation used is
l's complement
2's complement
signed binary
any of the above
⇒ Thermistor is used in
temperature measurement
temperature control
high temperature alarm circuits of devices
all of the above
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VER
COPY
MEM
DATE
⇒ In a circular waveguide TE_{21} mode has lowest cutoff frequency
TRUE
FALSE
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a solenoidal field
a conservative field
an irrotational field
none of these
⇒ A reactor is used in a dual converter operating in non-circulating current mode.
TRUE
FALSE