# Online Electronics and Communication Engineering Test - Electronics and Communication Engineering Test - Random

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- Total number of questions:
**20**. - Time allotted:
**30**minutes. - Each question carries 1 mark; there are no negative marks.
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#### Marks : 2/20

##### Test Review : View answers and explanation for this test.

*x*=

*u*(

*t*) sin 2

*t*then the forced response is K sin (2

*t*- θ). The value of θ given by

.

.

*s*, duty cycle is

.

Op-amp is an analog IC.

**Assertion (A):** In control system velocity error is not an error in velocity but is an error in position due to a ramp input.

**Reason (R):** For a type of system velocity error is zero.

- The root locus is symmetrical about real axis.
- If a root locus branch moves along the real axis from an open loop pole to zero or to infinity, this root locus branch is called real root branch.
- The breakaway points of the root locus are the solutions of

The quantities required to be measured in microwave circuits are frequency, power and impedance.

Microwave frequency measurement is done by slotted line, resonant cavities and transfer oscillator.

Microwave power measurement uses bolometers and microwave power meters.

A self balancing bridge working on the principle of power substitution is commonly used.

Microwave impedance measurement is done by measurement of reflection coefficient and VSWR.

A slotted line and probe is a basic tool for these measurements.' Network analyser enables rapid impedance measurement over a broad frequency range.

_{c}and C

_{E}can be assumed to be short at signal frequency and the effect of output resistance

*r*

_{0}can be ignored. If C

_{E}is disconnected from the circuit, which one of the following statements is TRUE?

Given circuit after removing C_{E} will behave as current-series feedback.

Overall voltage gain will decrease as feedback signal comes into picture and since it is current-series feedback, input impedance increases.

.

- D
_{n2}- D_{n1}= r_{s} - E
_{t1}= E_{t2} - E
_{n1}= E_{n2}