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61
Given f(z) = g(z) + h(z), where f, g, h are complex valued functions of a complex variable z. Which one of the following statements is TRUE?
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Answer: Option B
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62
All the values of the multi-valued complex function 1i, where $${\text{i}} = \sqrt { - 1} ,$$   are
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Answer: Option B
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63
If f(x + iy) = x3 - 3xy2 + i$$\phi $$(x, y) where $${\text{i}} = \sqrt { - 1} $$   and f(x + iy) is an analytic function then $$\phi $$(x, y) is
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Answer: Option B
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64
Potential function $$\phi $$ is given as $$\phi $$ = x2 - y2. What will be the stream function $$\psi $$ with the condition $$\psi $$ = 0 at x = y = 0?
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Answer: Option A
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65
Consider likely applicability of Cauchy's Integral Theorem to evaluate the following integral counter clockwise around the unit circle c.
$$I = \oint\limits_{\text{c}} {\sec {\text{z}}} {\text{dz,}}$$   z being a complex variable. The value of $$I$$ will be
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Answer: Option A
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66
For a complex number z = 1 - 4i with $${\text{i}} = \sqrt { - 1} ,$$   the value of $$\left| {\frac{{{\text{z}} + 3}}{{{\text{z}} - 1}}} \right|$$  is
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Answer: Option D
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67
The value of the contour integral $$\oint\limits_{\left| {{\text{z}} - {\text{i}}} \right| = 2} {\frac{1}{{{{\text{z}}^2} + 4}}{\text{dz}}} $$    in positive sense is
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Answer: Option D
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68
The value of $$\oint {\Gamma \frac{{3{\text{z}} - 5}}{{\left( {{\text{z}} - 1} \right)\left( {{\text{z}} - 2} \right)}}{\text{dz}}} $$     along a closed path $$\Gamma $$ is is equal to (4πi), where z = x + iy and $${\text{i}} = \sqrt { - 1} .$$   The correct path $$\Gamma $$ is
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Answer: Option B
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69
The contour integral $$\oint\limits_{\text{C}} {{{\text{e}}^{\frac{1}{{\text{z}}}}}{\text{dz}}} $$   with C as the counter-clockwise unit circle in the z-plane is equal to
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Answer: Option C
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70
A complex function f(z) = u(x, y) + iv(x, y) and its complex conjugate, f'(z) = u(x, y) - iv(x, y) are both analytic in the entire complex plane, where z = x + iy and $${\text{i}} = \sqrt { - 1} .$$   The function f is then given by
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Answer: Option C
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