Assertion (A): Inverters and choppers use fast switching thyristors Reason (R): Fast switching SCR has low turn off time. | |
A. | Both A and R are correct and R is correct explanation of A [Correct Answer] |
B. | Both A and R correct but R is not correct explanation of A [Wrong Answer] |
C. | A is correct but R is wrong [Wrong Answer] |
D. | A is wrong but R is correct [Wrong Answer] |
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Explanation:-
Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
⇒ An atom of a rare gas is placed is an electric field E. Then
the nucleus will be shifted in the direction of E by an amount which is proportional to E.
the nucleus will not be shifted.
the nucleus will be shifted in the direction of E by an amount which is independent of E.
the nucleus will be shifted in a direction opposite to that of E.
⇒ For wired AND connection we should use
TTL gates with active pull up
TTL gates with open collector
TTL gates without active pull up and with open collector
any of the above
⇒ In calculating output impedance of an amplifier the source is replaced by an open circuit.
TRUE
FALSE
⇒ When an electric field E is applied to solid and liquid insulating materials, the internal field E_{i} acting at the location of atom is such that
E_{i} = E
E_{i} > E
E_{i} < E
E_{i} may be equal to or less than E
⇒ When P-N junction is in forward bias, by increasing the battery voltage
current through P-N junction reduces
current through P-N junction increases
circuit resistance increases
none of the above
⇒
Match the following:
List I | List II | ||
---|---|---|---|
A. | shift Register | 1. | Frequency division |
B. | Counter | 2. | Addressing in memory chips |
C. | Decoder | 3. | Serial to parallel Data conversion |
A-3, B-2, C-1
A-3, B-1, C-2
A-2, B-1, C-3
A-1, B-2, C-2
⇒ When a power diode is conducting, the voltage drop across it is about
I V
5 V
20 V
50 V
⇒ The input gate current of FET is closer to
few amperes
few milli amperes
few microamperes
negligibly smaller value
⇒ If the differential voltage gain and the common mode voltage gain of a differential amplifier are 48 dB and 2 dB respectively, then its common mode rejection ratio is
23 dB
25 dB
46 dB
50 dB
⇒ In which frequency range is the noise figure in a transistor independent of frequency
intermediate frequencies
high frequency
low frequencies
both low and high frequencies
⇒ The input resistance of JFET ideally approaches
zero
1 ohm
100 ohm
infinity
⇒
Assertion (A): In a parallel circuit having two branches, each branch current may be more than source current.
Reason (R): Calculations in ac circuits use rules of complex algebra.
Both A and R are true and R is correct explanation of A
Both A and R are true and R is not the correct explanation of A
A is true but R is false
A is false but R is true
⇒ A scheme shown below is to generate a wide band FM modulate sign
30
6
250
12
⇒ In modern MOSFET_{S}, the material used for the gate is
high purity silicon
high purity silica
heavily doped polycrystalline silicon
epitaxial grown silicon
⇒ The antenna current of an AM transmitter is 8 A, when only the carrier is sent, but it increases to 8.93 A when the carrier is modulated by a single sine wave. Determine the antenna current when the percent of modulation changes to 0.8
9.19 A
9.91 A
10.56 A
8.61 A
⇒ The Boolean expression for the shaded area in the Venn diagra
X + Y + Z
XY + Z + X YZ
X Y Z + XY
X + Y + Z
⇒ In a PCM system, if the code word length is increased from 6 to 8 bits, the signal to quantization noise ratio improves by the factor.
42953
12
16
8
⇒ The spectral component of noise associated with k^{th} frequency is given, in the limit as Δf → 0 by n_{k}(t) written as n_{k}(t) = C_{k} cos (2pk Δft + θ_{k1, 2 only1, 3 only1, 2, 32, 3 only}
⇒ When an ac circuit has sources of different frequencies, the only method of analysis is superposition theorem.
TRUE
FALSE
⇒ The number of bits in ASCII is
12
10
9
7
⇒ An arithmetic statement in C must be
integer mode arithmetic statement
real mode arithmetic statement
mixed mode arithmetic statement
any of the above
⇒ If v(t) = 0 for t < 0 and e^{-at} for t ≥ 0 V(jω) = 1/(a + jω).
TRUE
FALSE
⇒ Inputs A and B of the given figure are applied to a NAND gate. The output is
from 0 to 6
from 0 to 2
from 0 to 1 and 2 to 3
from 1 to 2 and 3 to 4
⇒ In a TV, studio the function of vision switcher is to
edit television programs
relay television programs
control zoom lens
mix audio and video signals
⇒
Assertion (A): The Fourier series of the wave shown in the figure does not contain even harmao
Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is true, R is false
A is false, R is true
⇒ One T state is precisely equal to one clock period.
TRUE
FALSE
⇒ Assume that op-amp in figure is ideal. If input V_{i} is triangular, the output V_{0} wil
square wave
sine wave
triangular wave
parabolic wave
⇒ MOS circuits as compared to bipolar circuits take
more chip area
less chip area
same chip area
none of these
⇒ At resonance, the parallel circuit constituted by an iron-cored coil and a capacitor behaves
open circuit
short circuit
pure resistor of value R
pure resistor of value much higher than R
⇒ The impedance 3.2 - j 12 in polar form is given as
6.4 ∠ - 75°
8.4 ∠ - 75°
10.4 ∠ - 75°
12.4 ∠ - 75°