Assertion (A): For large signal variations an amplifier circuit has to be analysed graphically Reason (R): The output characteristics of a transistor is nonlinear.  
A.  Both A and R are correct and R is correct explanation for A [Correct Answer] 
B.  Both A and R are correct but R is not correct explanation for A [Wrong Answer] 
C.  A is correct R is wrong [Wrong Answer] 
D.  A is wrong 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 
⇒ If A = 3 + j1 and B = 4 + j3, A + B =
7 ∠45°
10 ∠45°
8.062 ∠29.7°
8.062 ∠73°
⇒ Bandwidth will be
a.b
a + b
a
b
⇒ Ferrite have
low copper loss
low eddy current loss
low resistivity
higher specific gravity compared to iron
⇒ The resistance of a 125 Ω strain gauge changes by 1 ohm for 4000 micro strain. The gauge factor is
1.5
2
2.5
3
⇒ The control logic for a binary multiplier is specified by a states diagram. The state diagram has four states and two inputs. To implement it by the sequence register and decoder method.
two flipflop & 2 x 4 decoder are needed
four flipflop & 2 x 4 decoder are needed
two flipflop & 3 x 9 decoder are needed
four flipflop & 3 x 9 decoder are needed
⇒ A colour monitor usign 16 bits at a resolution of 600 x 400 pixels needs a memory of
240000 B
9600 B
6400 B
480000 B
⇒ If the Q of a singlestage singletuned amplifier is doubled, then its bandwidth will
remain same
become half
become doubled
become four times
⇒ How many lines are there in address bus of 8085 μp?
6
8
12
16
⇒ The relation between thermal conductivity K (W/m/°C), heat flow density Q (watt/m^{2}) and dT/dx (°C per metre) is
Q = K(dT/dx)
Q =  K(dT/dx)
K = Q(dT/dx)
dT/dx =  QK
⇒ In a TWT the amplitude of resultant wave travelling down the helix remains constant
TRUE
FALSE
⇒ Which one is correct?
Sky wave propagation (2 to 30 MHz)
Space wave propagation (> 30 MHz)
Tropospheric propagation (> 300 MHz)
All of the above
⇒ The relation between bandwidth B, modulating frequency f_{m} and frequency deviation Δf for a sinusoidally modulated FM signal is
B = Δf + f_{m}
B = 2(Δf + f_{m})
B = f_{m}  Δf/
B = 2(f_{m}  Δf)
⇒
Assertion (A): A half cycle of sine wave can be expressed as sum of sine wave and another sine wave shifted by T/2 where T is the time period.
Reason (R): The function u(t  t_{0})  u(t  t_{0}  T) is a gate function occuring at t = t_{0} and of duration T.
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
⇒ Medium scale integration refers to ICs with
more than 12 but less than 30 gates on the same chip
more than 50 gates on the same chip
more than 20 but less than 100 gates on the same chip
more than 12 but less than 100 gates on the same chip
⇒ A system is said to be marginal stable if
poles lies on Real axis
zero lies on Real axis
poles lies on Imaginary axis
zeros lies on origin
⇒ The maximum effective aperture of a microwave antenna which has a directivity of 900, will be
71.619 λ^{2}
716.19 λ^{2}
7161.9 λ^{2}
71619 λ^{2}
⇒ The resolution of a 12bit D/A converter using a binary ladder with + 10V as the full scale output will be
2.44 mV
3.50 mV
4.32 mV
5.12 mV
⇒ The precision of an instrument indicates its ability to reproduce a certain reading with a given
drift
resolutions
shift
consistency
⇒ UHF range is
3 to 30 MHz
30 to 300 MHz
300 to 3000 MHz
3000 to 30000 MHz
⇒ Fourier transform pair are
autocorrelation and power spectral density
autocorrelation and convoloution
convolution and power spectral density
autocorrelation and energy
⇒ Which of the following form of angle modulation in this? If e = 10 sin(10^{8} t + 3 sin 10^{4} t)
AM
FM
AM or FM
AM or PCM
⇒ The main advantage of DM over PCM is
less bandwidth
less power
simple circuit
better S/N ratio
⇒
Assertion (A): A parallel resonant circuit is also called antiresonant circuit.
Reason (R): In a parallel resonant circuit impedance is maximum at resonance.
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
⇒ The drain characteristics of JFET in operating region, are
inclined upwards
almost flat
inclined downwards
inclined upwards or downwards
⇒ In Java which operator can be used even if there is a single operand
+

*
%
⇒ The equivalent of the block diagram in figure is give
Figure (a)
Figure (b)
Figure (c)
Figure (d)
⇒ In a single phase full wave regulator, the firing angles in the positive and negative half cycles are generally
equal
different
equal or different
different but sometimes equal
⇒ Two network said to be dual to each other
if mesh equation of one is same to other of node equation
if mesh equation of both is same
if node equation of both is same
neither mesh equation nor node equation is same
⇒
Assertion (A): The conductivity of an n type semiconductor increases with increase in temperature and increase in density of donor atoms.
Reason (R): Diffusion of carriers occurs in semiconductors.
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true
⇒ Which of the following cannot be the Fourier series expansion of a periodic signal?
x(t) = 2 cos t + 3 cos 3t
x(t) = 2 cos pt + 7 cos t
x(t) = cos t + 0.5
x(t) = 2 cos 1.5pt + sin 3.5 pt