Wednesday, 23 March 2016
SEATING ARRANGEMENT FOR 1ST YAER FOR MID SEM EXAM MARCH 2016
Tuesday, 22 March 2016
SEATING ARRANGEMENT FOR MID SEM EXAM EXAM MARCH/ APRIL 2016
Saturday, 19 March 2016
Friday, 18 March 2016
Electrical Drives
Question Bank
Unit :1
1) Advantages of electrical drives.
2)State essential part of electrical
drives.
3)What are the functions of power modulator?
4) Draw block diagram of electrical drive
and explain briefly function of each block.
5) What is electrical drive? Enlist
advantages of electrical drive.
6) Enlist factors to be considered for
selection of electrical drive.
Unit :2
1)Explain different types of load on
electrical drives.
2)Explain quadrilateral diagram of speed
and torque characteristic (four quadrant operation)
3)Write a note on load torque and its
classification.
4)Dynamic equation of motor load
combination.
5)Determination of moment of inertia of a
motor.
6)Write a note on stability of an
electrical drive.
Unit :3
As per the review questions given at the
end of ch. -3 in Electrical Drives – Tech max.
Unit :4
1) Explain self tuning control method.
2) Explain the Model Reference Adaptive
control.
3) Explain sliding mode control method.
Unit :5
1)
Explain the speed torque characteristic of DC series motor.
2) Explain the speed torque
characteristic of DC shunt motor.
Unit : 6
1) Explain d-q model of induction motor.
2) Explain constant flux speed control of
induction motor.
3) Explain concept of vector control of
3- ɸ induction motor.
4) Draw and explain block diagram of direct
vector control method in 3- ɸ induction motor.
5) Draw and explain block diagram of indirect
vector control method in 3- ɸ induction motor.
6) Explain how dynamic performance of 3- ɸ
induction motor can be converted like dynamic performance of separately excited
DC motor.
Question
Bank
Subject
Code:2141005
Subject
Name: Signals and Systems
Prepared
by: Prof. A.K.Giri
Q.1 For each of the following systems
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i)
y(t) = x(t-2) + x(2-t)
ii)
y(n) = nx(n)
determine
which of properties “memoryless”, “time invariant”, “linear”, “casual” holds
and justify your answer.
Q2 Using the convolution integral to find
the response y(t) of the LTI system with
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impulse
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response
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h(t) = e −β t u(t)
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to
the input x(t) =e −α t u(t) for α = β and
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α ≠ β .
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Q.3 Determine the Fourier transform of each
of the following signals:
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i)
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−αt
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α > 0
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x (t)
= e
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cos ω 0 t u(t),
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ii)
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1 −n
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x[n] =
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u[ − n −1]
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2
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Q4 Determine the Fourier series
representations for the signal x(t) shown in figure
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below.
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OR
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Q5 Let x(t) be a
periodic signal whose Fourier series coefficients are
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2,
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k = 0
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ak
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=
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j(
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k
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, otherwise
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2
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Use Fourier series
properties to answer the following questions:
(a)
Is
x(t) real ?
(b)
Is
x(t) even ?
(c) Is
dx(t)
even ? dt
Q6 Consider a causal and stable LTI system S whose input
x[n] and output y[n] are 07 related through the second-order difference
equation
y[n] − 16 y[n− 1] − 16 y[n− 2] = x[n].
1
ii)
Determine
the impulse response h[n] for the system S.
Q7 State and prove the following properties
of the Fourier transform.
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i)
Time
Shifting
ii)
Time
Scaling.
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Q8
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Determine the z-transform for the
following sequences. Sketch the pole-zero
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plot and
indicate the ROC. Indicate whether or not the Fourier transform of the
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sequence exists.
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i)
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δ[n+5]
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ii)
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1 n
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u[3 −n]
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Q9 Determine the Laplace transform and the associated
region of convergence and
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pole zero plot for each of the
following functions of time:
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i)
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x(t) = e −2 t u(t) +e −3t u(t)
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ii)
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x(t) = δ (t) +u(t)
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Q10
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Using the long division method,
determine the sequence that goes with the
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1−
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1
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−1
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2
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z
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following z-transforms:
x[z] =
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and x[n] is right sided.
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1
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−1
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1+
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2
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z
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Q11 Explain with example the properties and
importance of LTI Systems.
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Q12
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Consider a
causal LTI system whose input x[n] and output y[n] are related by
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the difference equation
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1 y[n− 1] + x[n].
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y[ n ] =
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Determine y[n] if x[n] = δ [n−1]
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4
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Q13
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Using the Partial fraction
method, determine the sequence that goes with the
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following z-transforms: X
(z) =
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3
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and x[n] is
absolutely summable.
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z −
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1
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−
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1 z−1
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4
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8
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Q14
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List the properties of the region
of convergence (ROC) for the z-Transform.
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Q15
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Consider the signal
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1
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n
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π
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cos
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n ≤ 0
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3
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x[n] =
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4
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n > 0
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0
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Determine the poles and ROC for X[z].
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Q16 Compute and plot the convolution y[n]
= x[n]*h[n] where
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1,
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3 ≤ n ≤8
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and
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x[n]=
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0,
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otherwise
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1,
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4 ≤ n ≤15
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h[n]=
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0,
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otherwise
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Q17
Determine whether or not each of the following signals is periodic. If the
signal 07 is periodic, determine its fundamental period.
i)
x(t) = [cos(2 t−π3 )]2
ii)
x[n] = cos(n2 π8 )
and GTU QUESTION PAPER WINTER 15
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