Question 1

The mode of operation in which the Gunn diode is not stable is:

Accepted Answer

A) gunn oscillation mode 
B) limited space charge accumulation mode 
C) stable amplification mode 
D) bias circuit oscillation mode 
A) gunn oscillation mode 
B) limited space charge accumulation mode 
C) stable amplification mode 
D) bias circuit oscillation mode A

Question 2

Important factors to be considered for power amplifier design are:

Accepted Answer

A) efficiency 
B) gain 
C) thermal effect 
D) all of the mentioned 
A) efficiency 
B) gain 
C) thermal effect 
D) all of the mentioned D

Question 3

The number of modes of operation for n type GaAs is:

Accepted Answer

A) two 
B) three 
C) four 
D) five 
A) two 
B) three 
C) four 
D) five C

Question 4

When either a voltage or current is applied to the terminals of bulk solid state compound GaAs, a differential __________is developed in that bulk device.

Accepted Answer

A) negative resistance 
B) positive resistance 
C) negative voltage 
D) none of the mentioned 
A) negative resistance 
B) positive resistance 
C) negative voltage 
D) none of the mentioned

Question 5

__________ amplifiers are linear circuits, where the transistor is biased to conduct over the entire range of the input signal cycle.

Accepted Answer

A) class a amplifiers 
B) class b amplifiers 
C) class c amplifiers 
D) none of the mentioned 
A) class a amplifiers 
B) class b amplifiers 
C) class c amplifiers 
D) none of the mentioned

Question 6

Gain of power amplifiers __________  with increase in operating frequency.

Accepted Answer

A) increases 
B) decreases 
C) increases exponentially 
D) decreases exponentially 
A) increases 
B) decreases 
C) increases exponentially 
D) decreases exponentially

Question 7

__________are used in the final stages of radar and radio transmitters to increase the radiated power level.

Accepted Answer

A) power amplifiers 
B) oscillators 
C) transistors 
D) attenuators 
A) power amplifiers 
B) oscillators 
C) transistors 
D) attenuators

Question 8

Power amplifiers in the increasing order of efficiency is:

Accepted Answer

A) class a, b, c 
B) class c, a, b 
C) class b, a, c 
D) efficiency of all the 3 amplifiers is the same 
A) class a, b, c 
B) class c, a, b 
C) class b, a, c 
D) efficiency of all the 3 amplifiers is the same

Question 9

If the output power of an amplifier is 10 V, and the input power supplied to the amplifier is 0.229 V given that the DC voltage used is

Accepted Answer

A) 25% 
B) 50% 
C) 75% 
D) 35% 
A) 25% 
B) 50% 
C) 75% 
D) 35%

Question 10

Which of the following statement about antenna array is false?

Accepted Answer

A) field pattern is the product of individual elements in array 
B) field pattern is the sum of individual elements in array 
C) resultant field is the vector superposition of the fields from individual elements in array 
D) high directivity can be achieved for long distance communications 
A) field pattern is the product of individual elements in array 
B) field pattern is the sum of individual elements in array 
C) resultant field is the vector superposition of the fields from individual elements in array 
D) high directivity can be achieved for long distance communications

Question 11

GaAs is used in fabricating Gunn diode. Gunn diode is:

Accepted Answer

A) bulk device 
B) sliced device 
C) made of different type of semiconductor layers 
D) none of the mentioned 
A) bulk device 
B) sliced device 
C) made of different type of semiconductor layers 
D) none of the mentioned

Question 12

The electrodes of a Gunn diode are made of:

Accepted Answer

A) molybdenum 
B) gaas 
C) gold 
D) copper 
A) molybdenum 
B) gaas 
C) gold 
D) copper

Question 13

If a power amplifier has an output power of 10 W, and an amplifier gain of 16.4 dB, then the input drive power is:

Accepted Answer

A) 400 mw 
B) 225 mw 
C) 229 mw 
D) 240 mw 
A) 400 mw 
B) 225 mw 
C) 229 mw 
D) 240 mw

Question 14

The electrical size of antenna is increased by antenna array to avoid size lobes compared to single antenna.

Accepted Answer

A) True 
 B)False

Question 15

Behavior of a transistor in power amplifiers is unpredictable at all input signal levels.

Accepted Answer

A) True 
 B)False

Question 16

In a GaAs n-type specimen, the current generated is constant irrespective of the electric filed applied to the specimen.

Accepted Answer

A) True 
 B)False

Question 17

When the electric field applied to GaAs specimen is less than the threshold electric field, the current in the material:

Accepted Answer

A) increases linearly 
B) decreases linearly 
C) increases exponentially 
D) decreases exponentially 
A) increases linearly 
B) decreases linearly 
C) increases exponentially 
D) decreases exponentially

Question 18

The modes of operation of a Gunn diode are illustrated in a plot of voltage applied to the Gunn diode v/s frequency of operation of Gunn diode.

Accepted Answer

A) True 
 B)False

Question 19

A class B amplifier consists of __________   transistors in order to conduct the input signal over the entire cycle.

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 6 
A) 1 
B) 2 
C) 4 
D) 6

Question 20

If the progressive shift in antenna array is equal to zero then it is called __________

Accepted Answer

A) broad side 
B) end-fire 
C) yagi-uda 
D) fishbone antenna 
A) broad side 
B) end-fire 
C) yagi-uda 
D) fishbone antenna

The mode of operation in which the Gunn diode is not stable is:

Important factors to be considered for power amplifier design are:

The number of modes of operation for n type GaAs is:

When either a voltage or current is applied to the terminals of bulk solid state compound GaAs, a differential __________is developed in that bulk device.

__________ amplifiers are linear circuits, where the transistor is biased to conduct over the entire range of the input signal cycle.

Gain of power amplifiers __________ with increase in operating frequency.

__________are used in the final stages of radar and radio transmitters to increase the radiated power level.

Power amplifiers in the increasing order of efficiency is:

If the output power of an amplifier is 10 V, and the input power supplied to the amplifier is 0.229 V given that the DC voltage used is

Which of the following statement about antenna array is false?

GaAs is used in fabricating Gunn diode. Gunn diode is:

The electrodes of a Gunn diode are made of:

If a power amplifier has an output power of 10 W, and an amplifier gain of 16.4 dB, then the input drive power is:

The electrical size of antenna is increased by antenna array to avoid size lobes compared to single antenna.

Behavior of a transistor in power amplifiers is unpredictable at all input signal levels.

In a GaAs n-type specimen, the current generated is constant irrespective of the electric filed applied to the specimen.

When the electric field applied to GaAs specimen is less than the threshold electric field, the current in the material:

The modes of operation of a Gunn diode are illustrated in a plot of voltage applied to the Gunn diode v/s frequency of operation of Gunn diode.

A class B amplifier consists of __________ transistors in order to conduct the input signal over the entire cycle.

If the progressive shift in antenna array is equal to zero then it is called __________

Antennas and Frequency Multipliers

Antenna and Transmission Line

Antenna Fundamentals and Characteristics

Microwave Devices and Their Operation: Gunn Diodes, Impatt Diodes, Klystron Tubes

RF Devices and Circuits

Microwave Network Noise Figure, Oscillator Circuits, and Negative Resistance Devices

Filters

Exam 4: Antenna Arrays, Power Amplifiers, and Gunn Diodes

The mode of operation in which the Gunn diode is not stable is:

Important factors to be considered for power amplifier design are:

The number of modes of operation for n type GaAs is:

When either a voltage or current is applied to the terminals of bulk solid state compound GaAs, a differential __________is developed in that bulk device.

__________ amplifiers are linear circuits, where the transistor is biased to conduct over the entire range of the input signal cycle.

Gain of power amplifiers __________ with increase in operating frequency.

__________are used in the final stages of radar and radio transmitters to increase the radiated power level.

Power amplifiers in the increasing order of efficiency is:

If the output power of an amplifier is 10 V, and the input power supplied to the amplifier is 0.229 V given that the DC voltage used is

Which of the following statement about antenna array is false?

GaAs is used in fabricating Gunn diode. Gunn diode is:

The electrodes of a Gunn diode are made of:

If a power amplifier has an output power of 10 W, and an amplifier gain of 16.4 dB, then the input drive power is:

The electrical size of antenna is increased by antenna array to avoid size lobes compared to single antenna.

Behavior of a transistor in power amplifiers is unpredictable at all input signal levels.

In a GaAs n-type specimen, the current generated is constant irrespective of the electric filed applied to the specimen.

When the electric field applied to GaAs specimen is less than the threshold electric field, the current in the material:

The modes of operation of a Gunn diode are illustrated in a plot of voltage applied to the Gunn diode v/s frequency of operation of Gunn diode.

A class B amplifier consists of __________ transistors in order to conduct the input signal over the entire cycle.

If the progressive shift in antenna array is equal to zero then it is called __________

Antennas and Frequency Multipliers

Antenna and Transmission Line

Antenna Fundamentals and Characteristics

Microwave Devices and Their Operation: Gunn Diodes, Impatt Diodes, Klystron Tubes

RF Devices and Circuits

Microwave Network Noise Figure, Oscillator Circuits, and Negative Resistance Devices

Filters