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WorksheetsQuiz on Power Supply & Communication Systems
Total questions: 25
Worksheet time: 14mins
Which circuit in the power supply converts low voltage AC to pulsating DC?
Transformer
Rectifier
Filter
Voltage Regulator
Which block in the Power Supply converts pulsating DC to smoothened DC?
Rectifier
Filter
Voltage Regulator
Step down Transformer
The rectifier that uses single diode is
Half wave rectifier
Full Wave Rectifier
Bi-Phase Rectifier
Bridge Rectifier
What is the function of block B?)
Rectifier
Reservoir capacitor
Low pass filter
Regulator
What is the function of block A?
Transformer
Half wave rectifier
Full wave rectifier
Filter
What will be the approximate value of the DC component of the waveform at the output
of block A?
Vpkx 0.318
Vpk x 0.5
Vpk x 0.637
VpkK x 0.707
Refer to Fig 1.3.2. If input B is more positive
than input A, which diodes will be conducting?
D1 and D2.
D2 and D3
D1 and D4
D3 and D4
Refer to Fig 1.3.2. If D4 were to go short circuit, what would be the effect on the operation of the circuit?
decrease in the current through D1.
Fuse F1 would blow
A higher voltage across the load
A larger peak current through D2 and D3.
What is the action of the reservoir capacitor in a basic power supply circuit?
To de-couple the DC component of the rectifier AC output.
To Increase the DC component and reduce the AC component of the AC wave.
To remove the DC component of the AC wave.
To regulate the AC wave
Which of the following is an advantage of using a LC low pass filter rather than a RC low pass filter in a
power supply?
The reactance of L will be much lower than the resistance of R at mains frequency
The reactance of L will be much higher than the resistance of R at mains frequency.
An inductor can dissipate more power than a resistor
LC filters are less expensive than RC filters.
Zener diode is a heavily doped silicon diode which is operated in ----------------- region.
break down
reverse breakdown
reverse biased
forward biased
A 5V zener diode has a maximum rated power dissipation of 500 mW. If the diode is to be used in a simple regulator circuit to supply a regulated 5V to a load having a resistance of 400Ω, determine a suitable value of series resistor for operation in conjunction with a supply of 9 V
30Ω< RS < 300Ω
40Ω < RS < 220Ω
30Ω < RS < 320Ω
40Ω < RS < 320Ω
The transmission medium used for TV transmission is ----------
Twisted Pair cable
Coaxial Cable
Optical Fibre
Soft-wired
The signals are transmitted to the open space in the form electromagnetic waves or radio waves. Such channels are -----------
Hardwired Channels
Soft-wired Channels
Radio channels
None
The measure of the noise introduce by a circuit
SNR
Noise Figure
Noise Ratio
Noise Power
A process in which more than one signals are allowed to transmit through a single communication channel
Modulation
Multiplexing
Quantization
None
The process in which any one of the parameters (amplitude, frequency or phase) of the high frequency carrier signal is varied according to the instantaneous values of the low frequency message signal, keeping other parameters constant is called -------
Multiplexing
Transmission
Quantization
Modulation
The process in which the frequency of the carrier signal is varied according to the instantaneous values of the message signal
Frequency translation
Frequency Modulation
Frequency shift keying
All of these
The signals with four different phases can be represented by a diagram called ------
Constellation Diagram
Phase Diagram
Constophase diagram
All of these
A wireless communication standard for mobile devices.
Long Term Evolution
Long Term Evaluation
Long Term Transmission
Long Term Mobile Trasmission
Radio waves are guided by the earth and moves along the curved surface from the transmitter to the receiver. Such a radio wave propagation is called ------
Ground wave propagation
Troposphere wave propagation
Sky wave propagation
Space wave propagation
Direct line of sight wave from transmitting antenna to receiving antenna is required for -----
Space wave propagation
Sky wave propagation
Ground wave propagation
Ground wave propagation
The ----- method is suitable for voice communication
Frequency Division Duplexing
Time Division Duplexing
FDD or TDD
All of these
3G mobile systems uses ------- multiple access technique
FDMA
TDMA
CDMA
All of these
The sampled signal values are rounded off to their nearest value with the help of a circuit called as ------
Encoder
Sampler
Quantizer
Binarizer
