## MCQs of Complex Variables and Transforms

**1. There is a point at which a function ceases to be analytic is said to be?**

A. Non-Singular point

B. Non-regular point

C. Singular point

D. Regular point

**2. A² + b²=?**

A. (a + ι b)(a -ι b)

B. (a + b )(a-b)

C. (a + ι b )(a – b)

D. (a + b )(a- ι b)

**3. |z1 – z2 | =?**

A. ≤ Z1 + Z2

B. > Z1 + Z2

C. > |Z1| + |Z2|

D. ≤|Z1| + |Z2|

**4. |z1 + z2 | =**

A. > Z1 + Z2

B. ≤ Z1 + Z2

C. ≤|Z1| + |Z2|

D. > |Z1| + |Z2|

**5. What is the polar form of a complex number?**

A. r(secθ + ιcosecθ )

B. r ( tanθ + ιcotθ )

C. r (sinθ + ιcosθ)

D. r(cosθ + ιsinθ )

**6. Which one result is obtained by the addition of a step?**

A. Ramp Function shifted by an amount equal to step

B. Step Function shifted by an amount equal to ramp

C. Step function of zero slope

D. Ramp function of zero slope

**7. Which block of the discrete time systems requires memory?**

A. Signal Multiplier

B. Unit Advance

C. Unit Delay

D. Adder

**8. Which one belongs to the category of non-recursive systems?**

A. Non-causal FIR Systems

B. Causal FIR Systems

C. Non-causal IIR Systems

D. Causal IIR Systems

**9. An LTI system is called initially relaxed system only when_____?**

A. zero input produces an output equal to unity

B. zero input produces a non-zero output

C. zero input produces zero output

D. none of the above

**10. There is the number of samples present in an impulse response is said to be?**

A. element

B. length

C. array

D. string