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The input and output of a continuous time system are respectively denoted by x(t) and y(t) Which of the following descriptions corresponds to a causal system
y(t) = x(t - 2) + x(t + 4)
y(t) = x(t - 4) + x(t + 1)
y(t) = x(t + 5) + x(t + 5)
y(t) = x(t + 4) + x(t - 1)
A compensated wattmeter has its reading corrected for error due to which one of the following parameters
Frequency
Power consumed in current coil
friction
Power consumed in pressure coil
Which of the following antennas uses a number of varying length parallel elements
Yagi-Uda antenna
Comer reflection antenna
Pyramidal Horn
Helical Antenna
A single turn loop is situated in air, with a uniform magnetic field normal to itsplane.
The area of the loop is 5 m2 and the rate of change of flux density is 2 Wb/m2/s. What is the emf appearing at the terminals of the loop
-5 V
-0.4 V
0 V
-2 V
What current does represent in pn junction diode? (where the symbols have their usual meaning)
diffusion current
Reverse saturation current
forward current
drift current
The feedback control system shown in figure is stable for what values of K and T
K < 0, T > 0
K < 0, T > - 1
K > 0, T > - 1
K > 0, T > 0
A negative-feedback closed-loop system is supplied to an input 5
V. The system has a forward gain of 1 and a feedback gain of 1 and a feedback gain of 1. What is the output voltage
1.5 V
2.0 V
2.5 V
1.0 V
A conductor in x-y plane and having length 1 m is moving with a velocity V =
(2i + 3j + k) m/sec.
A magnetic induction field B = (i + 2j) Wb/m2 is applied to theconductor.
The potential difference between the ends of the conductor is
6 v
4.88 V
NONE OF THESE
convert into spherical co-ordinates
A = 2 sinΦ[sinΦ tanΦa r - sinΦa θ - a Φ]
NONE OF THESE
A = 2 sinθ[sinθ tanΦa r + sinΦa θ + a Φ]
A = 2 sinΦ[sinΦ tanΦa r + sinΦa θ + a Φ]
In the given circuit, the switch is open for a longtime.
At time t = 0, the switch isclosed.
What are the initial and final values of voltages across the inductor
0 V and 80 V
0 V and 0 V
80 V and 80 V
80 V and 0 V
For pole-zero plot shown, the system is __________
mixed phase
NONE OF THESE
maximum phase
minimum phase
Consider the following diagrams showing vector fields :The correct statements are
Which of the following may result in instability problem
Large error
High selectivity
High gain
Noise
At t = ∞; VR2 and VC will be
2, 0
2, 4
4, 4
0, 2
Which of the following stages has no phase inversion of the signal
CE and CC stages
Three CE stages
Two CE stages
CE stage and emitter follower
VR at t < T, t = ∞
100e-40x106t, 0
100e-40x103t, 0
100e-40x104t, 0
500e-40x104t, 0
Values of iL, , VC and at t = 0 are given by,
4 Amp, 4 Amp/sec, -12 volts, - 12 volts/s
6 Amp, - 2 Amp/sec, 0 volts, - 2 volts/sec
6 Amp, 0 Amp/sec, - 2 volts, - 2 volts/sec
4 Amp, - 4 Amp/sec, 12 volts, - 4 volts/s
Two infinitely long wires carrying current are as shown in the figurebelow.
One wire is in the y-z plane and parallel to the y-axis.
The other wise is in the x-y plane and parallel to the x-axis.
Which components of the resulting magnetic field are non-zero at the origin
x, y, z components
x, z components
x, y components
y, z components
Find equivalent capacitance if each capacitance is 1 F
5/12 F
6/10 F
6/5 F
56 F
If x1[n] x1(z) with ROC = R1 and x2[n] x2(z) with ROC = R2 then ROC for x1[n] + x2[n] will be __________ (where Ri → Region of convergence and x1[n] and x2[n] are causal)
R1 ∪ R2
(R1 ∩ R2) ∪ (R1)
R1 ∩ R2
(R1 ∪ R2) ∩ (R1)
1
2
22
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