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BFO stands for
Beat frequency oscillator
Ballistic Frequency Oscillator
Blocking Frequency Oscillator
Broad Frequency Oscillator
In a plate modulated class C amplifier, the peak supply voltage is
V. The maximum plate-cathode voltage can be
4 V
2.5 V
1 V
1.5 V
The distance of a direct broadcasting satellite from earth's surface is about
36000 km
10000 km
55000 km
1000 km
The modulating frequency in frequency modulation is increased from 10 kHz to 30kHz.
The bandwidth is increased by
increase by 30 kHz
1/6 times
6
increase by 20 kHz
The phase of colour subcarrier burst in PAL is along the axis at
-180°
+180°
±45°
±180°
Human ear can detect sound intensities of the order of
10-13 W/m2
10-8 W/m2
10-4 W/m2
10-18 W/m2
FM has poor efficiency than
AM-SC
PCM
am
PAM
The baud rate is
equal to twice the bandwidth of an ideal channel
equal to half the bandwidth of ideal channel
not equal to signalling rate
always equal to bit transfer rate
Present day stereophonic systems have
only CD playback facility
None of the above
both CD and tape playback facilities along with radio
only tape playback facility
Noise with uniform power spectral density of N0ω/Hz is passed through a filter H(ω) = 2 exp (-J ω ty) followed by an ideal low pass filter of bandwidth B Hz. The output noise power in watts is
4 N0B
16 N0B
2 N0B
8 N0B
Consider the following statements about Yagi Uda antenna It is unidirectionalIts gain is about 7 dBIt is used at VLFThe optimum separation is 0.11 Which of the above are correct
1, 2, 3, 4
1, 2, 4 only
1 and 2 only
1 and 4 only
A sequence x(n) with the z transform X(z) = z4 + z2 - 2z + 2 - 3z - 4 is applied as an input to a linear, time invariant system with the impulse response h(n) = 2δ(n -
3) where The output at n = 4 is
- 6
2
Zero
- 4
The modulation index of wideband FM signal is
Unity
nearly 0.67
less than unity
greater than unity
In standing wave pattern on a transmission line
voltage and current nodes coincide
voltage nodes and current antinodes as well as current nodes and voltage antinodes coincide
voltage and current antinodes coincide
Both (a) and (b)
If F(ω) is Fourier transform of f(t), then Fourier transform of f(t) cos2 ωct is
F(ω) - [F(ω + 2ωc) + F(ω - 2ωc)]
F(ω) + [F(ω + 2ωc) + F(ω - 2ωc)]
Resonant circuits are used in
both audio and RF amplifiers
RF amplifiers
Audio amplifiers
None of the above
In a CD, the depth and width of each pit is
0.5 μm each
0.5 μm and 1 mm respectively
1 μm each
1 μm and 0.5 mm respectively
For 10 bit PCM system, the signal to quantization noise ratio is 62 dB. If the number of bits is increased by 2, then the signal to quantization noise ratio will
increased by 6 dB
decreased by 6 dB
decreased by 12 dB
increased by 12 dB
MTI stands for
Microprocessor Tracking Index
Multiplexed Telemetry Index
Maximum Transmission Index
Moving Target Indicator
When a wave reaches the open circuited end of a line
all the forward energy is absorbed by the open circuit
Either (a) or (b)
all the forward energy is reflected by the open circuit
a small portion of energy is radiated into atmosphere and the remaining energy is reflected
1
2
28
56
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