# An Ideal power limited communication channel with additive white Gaussian noise is having 4 KHz band width ...

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An Ideal power limited communication channel with additive white Gaussian noise is having 4 KHz band width and Signal to Noise ratio of 255. The channel capacity is: a. 8 kilo bits /sec b. 9.63 kilo bits / Sec c. 16 kilo bits / Sec d. 32 kilo bits / Sec

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An Ideal power limited communication channel with additive white Gaussian noise with 1 MHz band width and Signal to Noise ratio of 15 is transmitting the information at theoretical maximum rate. If the Signal to Noise ratio is reduced to 7, how much bandwidth is required to maintain same rate: a. 15/7 MHz b.4/3 MHz c. 2 MHz d. None of these

The channel capacity under the Gaussian noise environment for a discrete memoryless channel with a bandwidth of 4MHz and SNR of 31 is.  a. 20 Mbps b. 4 Mbps c. 8 kbps d. 4 kbps

The capacity of a standard 4 KHz telephone channel with a 32 dB SNR is

If a signal band limited to fm is sampled at a rate less than 2fm, then the constructed signal will be A) Large in amplitude B) Small in amplitude C) Distorted D) Distortion less

The term “white noise” refers to the following: (1) A random signal with flat power spectral density (2) A random signal generated by beat signal (3) A random signal with long range correlation (4) All of the above are true

Television channel allocation (in MHz) for VHF band III is  A) 47-68 B) 174-230 C) 470-582 D) 606-870

For identical total transmitted power, the ratio of S/N for wide band FM to S/N of DSB-AM (with ma=1) is : ( Given fm = 15 KHz & frequency. deviation =+/- 75 KHz) a. 112.5 b. 300 c. 75 d. 450

In satellite communication, frequency modulation is used because satellite channel has  a. High modulation index  b. Small bandwidth and negligible noise  c. Large bandwidth and severe noise   d. Maximum bandwidth and minimum noise

In communication systems, noise due to quantization error is a) Linear and signal dependent b) Non-linear and signal dependent c) Linear and signal independent at low frequencies only d) non -linear and signal dependent at low frequencies only

In satellite communication, Ku band (in GHz) refers to  A) 4-8 B) 8-12 C) 12-18 D) 18-27

The bandwidth and S/N of a communication system are 3MHz and 30dB respectively. The channel capacity (in Mbps) is around  A) 30 B) 300 C) 0.3 D) None of these

A thyristor is triggered by a pulse train of 5 kHz. The duty ratio is 0.4. If the allowable average power is 100 W, the maximum allowable gate drive power will be

The RF amplifier A is having 3 dB NF & 5 dB of gain, amplifier B is having 3.5 dB NF & 15 dB . For overall noise figure of the cascaded system, the correct statement is :  a. A as first stage & B as second stage offers minimum over all NF b. B as first stage & A as second stage minimum over all NF c. Both the combination will offer same overall NF d. Over all NF will be less than 3 dB.

At an industrial sub-station with a 4 MW load, a capacitor of 2 MVAR is installed to maintain the load power factor at 0.97 lagging. If the capacitor goes out of service, the load power factor becomes (A) 0.85 (B) 1.00 (C) 0.80 lag (D) 0.90 lag

Output of an op-amp is a square wave of 4 V peak to peak with a rise time of 5 microsecond and fall time of 4 microsecond.Maximum frequency (in kHz)of undistorted sine wave output of 2 V peak to peak is about  A) 100 B) 150 C) 200 D) 250

The large signal bandwidth of an opamp is limited by its:  (1) Loop gain (2) Slew rate (3) Output impedance (4) Input frequency

The Ku frequency band used in satellite communication (for uplink and downlink) is: (1) 14 GHz and 11 GHz (2) 30 GHz and 20 GHz (3) 70 GHz and 50 GHz (4) 60 GHz and 45 GHz

The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is A) 50 W B) 66 W C) 68 W D) 70 W

A Reactor having an inductive reactance of 4 ohm is connected to the terminals of a 120 V AC generator. Calculate the power associated with the reactor.  (A) 3.6 kvar (B) 30 kvar (C) 7.2 kvar (D) 4.16 kvar

The effect of channel coding in communication channels is :  A) Reduced errors B) Increased bandwidth C) Reduced terminal size D) All of above

What is the channel capacity of a noisy channel with conditional probability of error p = 1/2? A) 0 B) 1 C) Infinity D) 2

In TDM systems, channel separation is done with the use of  (a) AND gates (b) band-pass filters (c) differentiator circuit (d) integrator circuit

Assume that the n-channel MOSFET shown in figure is ideal and that its threshold voltage is +1 .0 V. The voltage Vab between nodes a and b is A)5V B)2V C)1V D)0V

Bandwidth of an RC coupled amplifier is 100 kHz. Two such amplifiers are connected in cascade.Resultant bandwidth(in kHz) is around  A) 200 B) 100 C) 60 D) 30

Rise time of an amplifier is found to be 1.0µS, its bandwidth (in kHz) is around  A) 2200 B) 1000 C) 350 D) 220

Consider the following statements : Any element connected in  1. Series with an ideal current source is redundant. 2. Parallel with an ideal current source is redundant. 3. Series with an ideal voltage source is redundant. . 4. Parallel with an ideal voltage source is redundant.  Which of the above statements is/are correct ?

Digital modulation can withstand channel noise and distortion better than analog schemes (a) as long as the channel noise is within limits (b) for any noise (c) for thermal noise only (d) statement is not true

The modulation index of a FM Signal having modulating frequency 2 KHz and Max deviation is 10 KHz, is: -  a) 2 b) 5 c) 3 d) 4

The values of L and C for a low pass filter with cut off frequency of 2.5 KHz and operating with a terminated load resistance of 450 Ohm are given by  (a) 57.3 mH; 0.283 μF (b) 28.66 μH; 0.14 μF (c) 114.64 mH; 0.566 mF (d) 50.23 mH; 0.632 mF

Low pass filter with cut off frequency of 100 kHz and high pass filter with cut off frequency of 50 kHz are connected in tandem, the resultant filter is • Low pass filter with cut off frequency of 100 kHz • High pass filter with cut off frequency of 50 kHz • Band pass filter with pass band from 50 kHz to 100 kHz. • None of the above.

In a PCM system the number of quantization level are 16 and the maximum signal frequency is 4 KHz the transmission bit rate is

What is the Fourier transform of a Gaussian time pulse? A) Uniform B) Gaussian C) Impulses D) Pulse

Find the noise factor for an antenna at 27°C with equivalent noise temperature 30°K: (1) 20 (2) 100 (3) 300 (4) 1.1

An inductor of Q factor 10 is connected in series with a capacitor having a Q factor of 100. The overall Q factor of the circuit is :  (A) 100/11 (B) 11/100 (C) 110 (D) 1000

A waveguide termination having VSWR of 1.1 is used to dissipate 100 watts of power. The reflected power will be A) 0.2268 W B) 0.5868 W C) 0.3468 W D) 0.4568 W

The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?

For an SCR with turn-on time of 5 microsecond, an ideal trigger pulse should have   (a) short rise time with pulse width = 3 µsec (b) long rise time with pulse width = 6 µsec (c) short rise time with pulse width = 6 µsec (d) None of the above

For an earth station transmitter, with an antenna output power of 40dBW 10,000W, a back-off loss of 3dB, a total branching and feeder loss of 3dB, a total branching and feeder loss of 3dB and transmit antenna gain of 4dB, the effective isotropic radiated power (EIRP will be  a) 38dBW b) 40 dBW c 36 dBW d) 47 dBW

The maximum load that a power transformer can carry is limited by its?

An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V

An ideal power supply consist of   (A) Very small output resistance (B) Zero Internal resistance (C) Very large input resistance (D) Very large output resistance

A 4-pole, 3-phase, double-layer winding is housed in a 36-slot stator for an ac machine with 60o phase spread. Coil span is 7 short pitches. Number of slots in which top and bottom layers belong to different phases is  (A) 24 (B) 18 (C) 12 (D) 0

The Lissajous pattern on the screen of a CRO is an ellipse with major axis in quadrant 2 and quadrant 4. Then the phase difference between two signals Can be :  (A) 270° (B) 210° (C) 180° (D) 300°

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An ideal Op Amp has  (a) infinite input and output impedance (b) very low input and output impedance (c) low input impedance and very high output impedance (d) infinite input impedance and zero output impedance

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