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22ec4204-Transmission Lines and Waveguides Quiz1

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

A transmission line exhibits

a)

high distortion

b)

low EMI

c)

maximum cross talk

d)

All of the options are correct

2.

An ideal transmission line should have

a)

finite length

b)

Low attenuation

c)

high SNR

d)

long length

3.

Which of the following is a primary parameter in the transmission line?

a)

R

b)

Zo

c)

ZL

d)

Propagation constant

4.

The purpose of the transmission line equation is to obtain

a)

primary parameters

b)

secondary parameters

c)

the reflection coefficient

d)

Impedance matching

5.

Which of the following parameters is not a primary parameter?

a)

Resistance

b)

Attenuation constant

c)

Capacitance

d)

Conductance

6.

The lines having R, L, C distributed along the circuit are called __________ lines.

a)

Lumped

b)

Distributed

c)

Parallel

d)

Paired

7.

Which primary parameter is uniformly distributed along the length of a conductor?

a)

G

b)

C

c)

L

d)

R

8.

The primary parameter that is associated with the magnetic flux linkage is

a)

G

b)

C

c)

L

d)

R

9.

The primary parameter that is associated with the electric charges is

a)

G

b)

C

c)

L

d)

R

10.

The leakage current in the transmission lines is referred to as the

a)

Resistance

b)

Radiation

c)

Conductance

d)

Polarization

11.

In a transmission line if the load impedance is same as that of the characteristic impedance, the line is said to be

a)

Parallel

b)

Perpendicular

c)

Polarized

d)

Matched

12.

In a transmission line if the load impedance is not same as that of the characteristic impedance

a)

reflections occur

b)

standing waves

c)

Both a and b

d)

None of the options are correct

13.

A line terminated with its characteristic impedance

a)

is not a matched line

b)

is a smooth line

c)

produces reflections

d)

produces standing waves

14.

For a line terminated with its characteristic impedance,

a)

input impedance not equal to its characteristic impedance

b)

input impedance equal to its load impedance

c)

input impedance and characteristic impedance are different

d)

input impedance equal to its characteristic impedance

15.

The input impedance of an infinite line is

a)

equal to its load impedance

b)

equal to its characteristic impedance

c)

not equal to its characteristic impedance

d)

infinite

16.

Frequency distortion can be reduced in high quality transmission lines by the use of _____ at the line terminals.

a)

Load impedance

b)

Equalizers

c)

Co-axial cables

d)

None of the options are correct

17.

Delay distortion is of relatively _______ in voice and music transmission.

a)

More importance

b)

Less importance

c)

Neither more nor less important

d)

All of these

18.

Delay distortion can be avoided by the use of _________ for video transmission.

a)

Open-wire lines

b)

Twisted pairs

c)

Co-axial cables

d)

Wave guides

19.

For a distortion less transmission line the characteristic impedance is

a)

purely real and independent of frequency

b)

purely imaginary

c)

neither real nor independent of frequency

d)

None of the options are correct

20.

For a line terminated with characteristic impedance

a)

there is only incident waves travelling in forward direction.

b)

there is only reflected waves.

c)

the incident waves and reflected waves both occur

d)

All of the options are correct

21.

If VR is reflected voltage and VS is incident voltage at the load, then the reflection coefficient K is given as

a)

K=VR*VS

b)

K=VR/VS

c)

K=VS/VR

d)

K=√VR*VS

22.

Identify the secondary parameter from the options given

a)

Resistance

b)

Conductance

c)

Phase constant

d)

Capacitance

23.

The velocity of wave in the air medium is _____ m/s

a)

1 x 108

b)

1.5 x 108

c)

3 x 108

d)

1 x 109

24.

The purpose of the transmission line equation is to

a)

find primary parameters

b)

find secondary parameters

c)

find the reflection coefficient

d)

impedance matching

25.

Identify the material which is not present in a transmission line setup.

a)

waveguides

b)

cavity resonator

c)

antenna

d)

oscillator

26.

Which of the following parameters does not exist in the transmission line equation?

a)

R

b)

ZO

c)

ZL

d)

Propagation constant

27.

If ZR is load impedance and ZO is the characteristic impedance, then the reflection coefficient K is given as

a)

(ZR-ZO)/(ZR+ZO)

b)

(ZR+ZO)/(ZR-ZO)

c)

(ZR-ZO)*(ZR+ZO)

d)

(ZR+ZO)*(ZR-ZO)

28.

________ denotes the distance traveled by a wave in the time of one cycle

a)

Frequency

b)

hop

c)

wavelength

d)

Crest

29.

If the SWR on a transmission line has a high value, the reason could be

a)

an impedance mismatch between the line and the load

b)

that the line is non-resonant

c)

a reflection coefficient of zero at the load

d)

that the load is matched to the line

30.

A feature of an infinite transmission line is that

a)

its input impedance at the generator is equal to the line's surge impedance

b)

its phase velocity is greater than the velocity of light

c)

its phase velocity is lesser than the velocity of light

d)

None of the options are correct

31.

Ratio of the mismatch between the antenna and the transmitter power produces

a)

Standing wave pattern

b)

reflected wave

c)

SWR

d)

Index of refraction

32.

What is the most commonly used transmission line for high frequency application?

a)

Two-wire balance line

b)

Single wire

c)

Three-wire line

d)

Coaxial

33.

The characteristic impedance of a transmission line does not depend upon its

a)

length

b)

conductor diameter

c)

conductor spacing

d)

dielectric material

34.

One of the following is not a common transmission line impedance.

a)

50 ohms

b)

75 ohms

c)

120 ohms

d)

300 ohms

35.

________ is a pattern of voltage and current variations along a transmission line not terminated in its characteristic impedance.

a)

An electric field

b)

Radio waves

c)

Standing waves

d)

A magnetic field

36.

What is the most desirable reflection coefficient?

a)

0

b)

1

c)

0.5

d)

infinity

37.

What is the ratio expressing the percentage of incident voltage reflected on a transmission line?

a)

Velocity factor

b)

Standing-wave ratio

c)

Reflection coefficient

d)

Line efficiency

38.

At very high frequencies, transmission lines act as

a)

Tuned circuits

b)

Antennas

c)

Insulators

d)

Resistors

39.

The most commonly used transmission line in television system.

a)

Parallel-wire line

b)

Coaxial cable

c)

Waveguide

d)

Open-wire ceramic supports

40.

Input impedance of an open or short circuited transmission line is

a)

infinity

b)

pure reactance

c)

0

d)

pure resistance

41.

An Open Circuited transmission line acts as

a)

a series resonance circuit

b)

an anti-resonance circuit

c)

pure resistive circuit

d)

None of the options are correct

42.

A Short Circuited transmission line acts as

a)

a series resonance circuit

b)

an anti-resonance circuit

c)

pure resistive circuit

d)

None of the options are correct

43.

At very high frequencies, transmission line performance depends on

a)

Resistance

b)

inductance

c)

capacitance

d)

all the options are correct

44.

Skin effect _____ with resistance

a)

increases

b)

decreases

c)

is equal

d)

None of the options are correct

45.

Nodes are points of ________

a)

value of voltage/current

b)

maximum

c)

minimum

d)

constant

46.

Anti-nodes are points of ________

a)

value of voltage/current

b)

maximum

c)

minimum

d)

constant

47.

Standing waves occur in ___________ lines.

a)

matched

b)

mismatched

c)

all

d)

None of the options are correct

48.

Ratio of the mismatch between the antenna and the transmitter power is

a)

Standing wave pattern

b)

Reflection coefficient

c)

SWR

d)

Index of refraction

49.

For an open circuited line, ZR is

a)

0

b)

infinite

c)

1

d)

50 ohms

50.

For a short circuited line, ZR is

a)

0

b)

infinite

c)

1

d)

50 ohms

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