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from pinoy bix amplifiers Flashcards

1
Q

which of the following is (are) power amplifiers

a. class a
b. class B or AB
c. class c or d
d. all of the above

A

all of the above

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2
Q

by how much does the output signal signal vary for a class AB power amplifier

A

between 180• and 360•

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3
Q

which type of amplifier is biased for operation at less that 180• of the cycle

A

Class C

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4
Q

which type of amplifier uses pulse digital signals in its operation

A

class D

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5
Q

which of the power amplifiers has the lowest overall efficiency

A

Class A

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6
Q

which of the following describes a power amplifier
a. it can handle large power
b. it can handle large current
c. it does not provide much voltage gain
d. all of the above

A

all of the above

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7
Q

amplifiers primarily provide sufficient power to an output load to drive a speaker from few watts to ten watts

A

power

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8
Q

the main features of a large signal amplifier is the circuit’s
a. power efficiency
b. maximum power limitations
c. impedance matching to the output device
d. all of the above

A

all of the above

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9
Q

Class AB operation is _____ operation
a. similar to class a
b. similar to class b
c. similar to class c
d. none of the above

A

none of the above

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10
Q

which operation class is generally used in radio or communications

A

Class D

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11
Q

Categorieze the power efficiency of each class of amplifier from worst to best

A

A,AB,B,D

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12
Q

what is the maximum efficiency of a Class A circuit with a direct or series fed load connection?

A

25%

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13
Q

what is the ratio of the secondary voltate to the primary voltage with the turn ratio in the winding?

A

N2/N1

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14
Q

the maximum efficiency of a transformer coupled class a amplifier

A

50%

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15
Q

what is the maximum efficiency of a class B circuit?

A

78.5%

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16
Q

how many transistors must be used in a class b power amplifier to obtain the output for the full cycle of the signal

A

2

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17
Q

Class B operation is provided when dc bias leaves the transistor biased just off, the transistor turning on when the ac signal is applied (true/false)

A

true

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18
Q

which of the push pull amplifierd is presently the most popular form of the class b power

A

Quasi Complementary

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19
Q

which of the following instruments displays the harmonic of a distorted signal

A

spectrum analyzer

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20
Q

which of the folloeing instrument allows more precise measurement of the harmonic components of a distorted signal

A

wave analyzer

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21
Q

maximum temp. rating for silicon power transistors

A

150• to 200•

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22
Q

which power amplifier is not intended primarily for large signal or power amplification

A

Class C

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23
Q

popular transistor driver device for class D amplification

A

MOSFET

24
Q

amplifier that has an output signal varies for a full 360 degrees of the cycle

A

class A

25
Q

Class B amplifieroutput signal varies of the cycle

A

180•

26
Q

highest overall efficiency amplifier

A

Class D

27
Q

Class D operation can achieve power efficiency of over

A

90%

28
Q

the beta of a power transistor is generally

A

less than 100

29
Q

First active satellite

A

Sputnik I

30
Q

First commercial satellite

A

Telstar

31
Q

first passive satellite transponder?

A

early bird

32
Q

First satellite to receive and transmit simultaneously

A

Telstar I

33
Q

A helical antenna is used for satellite tracking because of

A

circular polarization

34
Q

repeaters inside communications satellite are known as

A

Transponders

35
Q

considered unsolved problem in satellite system

A

privacy

36
Q

geographical representation of a satellite antenna radiation

A

footprint

37
Q

smallest beam of a satellite antenna radiation pattern

A

spot beam

38
Q

a satellite beam that covers almost 42.4% of the earths surface

A

global beam

39
Q

frequency range of C band

A

3.4 to 6.45 GHz

40
Q

a satellite signal transmitted from a satellite transponder to earth station

A

Downlink

41
Q

collects a very weak signal from broadcast satellite

A

Satellite Dish

42
Q

detects the satellite signal relayed from the feed and converts it to an electric current amplifies and lowers its frequency

A

LNA

43
Q

loss of power of a satellite downlink signal due to earth’s atmosphere

A

path loss

44
Q

what height must a satellite be placed above the surface of the earth in order for its rotation?

A

22,426.4 miles

45
Q

point on the satellite orbits closest to the earth

A

perigee

46
Q

earth area covered by a satellite radio beam

A

foot print

47
Q

what is the local oscillator frequency of the satellite with an uplink frequency in GHz band

A

2225 MHz

48
Q

vsat was made available in

A

1979

49
Q

what band does vsat first operate

A

C band

50
Q

First Philippine Mabuhay satellite has how many channels

A

30

51
Q

The first philippine agila I will have how many transponder

A

36

52
Q

approximate path loss from satellite to earth station

A

200 dB

53
Q

INTELSAT

A

International Telecommunications Satellite

54
Q

a satellite cross link means

A

satellite to satellite link

55
Q

delay time for satellite transmission from earth transmitter to earth receiver

A

0.5 s

56
Q

as the height of a satellit3 orbit gets lower. the speed of the satellite

A

increases

ecel videos (4 decks)

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