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Assertion (A): Ideal current sources and ideal voltage sources do not exist in reality. Reason (R): All sources have finite internal impedances. | |
A. | Both A and R are individually true and R is the correct explanation of A [Correct Answer] |
B. | Both A and R are individually true but R is not the correct explanation of A [Wrong Answer] |
C. | A is true but R is false [Wrong Answer] |
D. | A is false but R is true [Wrong Answer] |
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Explanation:-
Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
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-0.3 dB
-3 dB
-6 dB
-10 dB
⇒ Which of the following devices uses a slow wave structure?
Klystron two cavity amplifier
Klystron multicavity amplifier
Reflex klystron oscillator
TWT
⇒ The EHT voltage in a picture tube of TV is
about 1000 kV
about 100 kV
about 15 kV
about 1 kV
⇒ In a biased limiter the clipping level can be adjusted by adjusting the voltage of battery.
TRUE
FALSE
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1%, 1 mv
10%, 10 mv
10%, 1 mv
1%, 10 mv
⇒ In a CE amplifier the Q point is very close to cutoff point on the load line. This results in
saturation clipping
cut off clipping
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either saturation clipping or cut off clipping
⇒ An arbitrary signal m (t) has zero average value and it is bandlimited to 3.2 kHz. It is sampled at the rate of 8 K samples/S. The samples are passed through an ideal bandpass filter with centre frequency of 32 kHz and bandwidth of 6.4 kHz. The output of band pass filter is
AM-DSB signal with suppressed carrier
AM-DSB signal with carrier
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a sequence of exponentially decaying sine waves
⇒ The property is not valid for basic singularity function is
it is even signal
convolution of any arbitary function x(t) and an impulse is the original function itself
the sum of two impulses at same location is the impulse with the strength equal to the summation of individual strengths.
none of these.
⇒ Among the filter, Bessel, Butterworth and chebyshev, the filter with maximally flat response is
all
butterworth
bessel
butterworth, Chebyshev
⇒ If poles lie in first quadrant, damping ratio is
1
more than 1
less than 1
zero
⇒ An SR flip flop can be built using
NOR gate only
NAND gate only
either NOR or NAND gates
neither NOR nor NAND gates
⇒ Access time of a storage is the time required
to write one word into the memory
to read one word from the memory
to write one word into and to read one word from the memory
either to write one word or to read one word
⇒ The current gain of a bipolar transistor drops at high frequencies because of
transistor capacitance
high current effects in the base
parasitic inductive elements
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Air cored
Cast iron cored
Sheet steel cored
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⇒ In a N-P-N transistor of the emitter junction is reverse biased and collector junction is also reversed biased, the transistor will operate in
active region
saturation region
cut-off region
inverted region
⇒ Which of the following lines behaves as infinite line?
a line terminated in inductance
a line terminated in capacitance
a short line
a line terminated in z_{0}
⇒ If the variance σ_{x}^{2} of d(n) = x(n) - x(n - 1) is one-tenth the variance σ_{x}^{2} of a stationary zero mean discrete time signal x(n), then the normalized autocorrelation function R_{xx}(x)/σ_{x}^{2} at k = 1 is
0.95
0.9
0.1
0.05
⇒ Which of the following radio waves are not reflected by ionosphere?
Waves above 1 kHz
Waves above 1 MHz
Waves above 10 MHz
Waves above 30 MHz
⇒ In a display specified as 600 x 400 the number of pixels across the display screen is
600
400
240000
either (a) or (b)
⇒ The Boolean function realized by the logic circuit show
F = Σm(0, 1, 3, 5, 9, 10, 14)
F = Σm(2, 3, 5, 7, 8, 12, 13)
F = Σm(1, 2, 4, 5, 11, 14, 15)
F = Σm(2, 3, 5, 7, 8, 9, 12)
⇒ A function is given f(t) = sin^{2}t + cos^{2}t. Which of the following is true?
f has frequency components at 0 and 1/2p Hz
f has frequency components at 0 and 1/p Hz
f has frequency components at 1/2p and 1/p Hz
f has frequency components at 0, l/2p and 1/p Hz
⇒ An image uses 512 x 512 picture elements. Each element can take any of eight distinguishable levels. The maximum entropy in the above image will be
2097152 bits
786432 bits
648 bits
144 bits
⇒ When a 1 V increase in gate voltage changes the drain current 10 mA in an FET, its g_{m} equals
10 μμ
100 μμ
1000 μμ
10000 μμ
⇒ In a minimum function
the degree of numerator is higher than that of denominator
the degree of numerator is lower than that of denominator
the degree of numerator and denominator are equal
the denominator is a constant
⇒ In the 2's complement Adder-Subtractor
sign magnitude numbers represent negative numbers
the sign magnitude numbers have "1" as leading bit
the sign magnitude numbers have '0' as leading bit
2's complement represents positive numbers
⇒ Consider a random noise voltage which has a uniform density function as shown in the figure and is known to be wh
2 bits/reading
5 bits/reading
10 bits/reading
none of these
⇒ Microwave signals transmitted towards the sky are
strongly absorbed by the ionosphere
strongly reflected by the ionosphere
transmitted through the ionosphere
unable to reach the ionosphere because of strong absorption in the lower atmosphere
⇒ A bipolar transistor is a __________ controlled devices whereas a FET is a __________ controlled devices.
current, voltage
current, current
voltage, current
voltage, voltage
⇒ 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