Microwave Devices and Circuits MCQs

Question 1

Which of the following is an example of erratic noise?

Accepted Answer

transistor noise

Answer

atmospheric

Answer

shot noise

Answer

ignition noise

Question 2

The effect of static nose on radio transmission is more during

Accepted Answer

night time

Answer

daytime

Answer

early morning

Answer

afternoon

Question 3

The noise figure of a network is

Accepted Answer

the ratio of signal-to-noise power ratio at the input to the signal-to-noise power ratio at the output

Answer

dependent on the load to which the network is connected

Answer

dependent on the conditions of matching present between the generator and input of network

Answer

dependent on atmospherec conductors

Question 4

The value of a resistor creating thermal noise is doubled. The noise power generated is

Accepted Answer

unchanged

Answer

halyed

Answer

quadrupled

Answer

doubled

Question 5

the spectral density of pink noise varies as

Accepted Answer

1/f

Answer

1/f2

Answer

f2

Answer

f

Question 6

White noise is that signal whose frequency spectrum

Accepted Answer

has flat spectral density

Answer

extends over infinite range

Answer

has spectral density varying as 1/f

Answer

has limited number of frequency components

Question 7

Indicate the false statement. The square of the thermal noise voltage generated by a resistor is proportional to

Accepted Answer

its temperature

Answer

its resistance

Answer

Boltzmann's constant

Answer

the bandwidth over which it is measured

Question 8

Two resistors producing noise voltages of 30 IN and 40 ItV are placed in series. The total noise voltage across the terminals of this series circuit is

Accepted Answer

50

Answer

70

Answer

1.33

Answer

17.1

Question 9

One major difference between shot and thermal noise is that shot noise is

Accepted Answer

associated and dependent on direct current through the device but thermal noise is not

Answer

present in vacuum tubes but thermal noise is not

Answer

idependent of bandwidth whereas thermal noise depends on it

Answer

directly proportional to electron charge but thermal noise is not