During transmission over a certain binary communication channel, bit errors occur independently with probability p. The probability of AT MOST one bit in error in a block of n bits is given by

**A. ** p^{n}

**B. ** 1 - p^{n}

**C. ** np( - p)n + ( + p)n
**D. ** 1 - (1 - p)n
**Answer : ****Option C**

**Explaination / Solution: **

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The field in a rectangular waveguide of inner dimension a × b is given by **A. ** TE_{20}

**B. ** TM_{11}

**C. ** TM_{20}

**D. ** TE_{10}

**Answer : ****Option A**

**Explaination / Solution: **

Where H_{0} is a constant, and a and b are the dimensions along the x − axis and
the y − axis respectively. The mode of propagation in the waveguide is

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A right circularly polarized (RCP) plane wave is incident at an angle 60^{0} to the
normal, on an air-dielectric interface. If the reflected wave is linearly polarized,
the relative dielectric constant ξ_{r} is.

**A. ** √2

**B. ** √3

**C. ** 2

**D. ** 3

**Answer : ****Option D**

**Explaination / Solution: **

No Explaination.

No Explaination.

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Consider the amplitude modulated (AM) signal For demodulating the signal using envelope detector, the minimum value of A_{c} should be

**A. ** 2

**B. ** 1

**C. ** 0.5

**D. ** 0

**Answer : ****Option A**

**Explaination / Solution: **

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A signal flow graph of a system is given below

**A. **

**B. **

**C. **

**D. **

**Answer : ****Option C**

**Explaination / Solution: **

The set of equalities that corresponds to this signal flow graph is

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A rectangular waveguide of internal dimensions (a = 4 cm and b = 3 cm) is to be operated in TE11 mode. The minimum operating frequency is

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Noise with double-sided power spectral density on K over all frequencies is passed through a RC low pass filter with 3 dB cut-off frequency of fc. The noise power at the filter output is

∞

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Consider the frequency modulated signal with carrier frequency of 10^{5} Hz. The modulation index is

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Which of the following statements is true regarding the fundamental mode of the metallic waveguides shown ?

**A. ** Only P has no cutoff-frequency

**B. ** Only Q has no cutoff-frequency

**C. ** Only R has no cutoff-frequency

**D. ** All three have cutoff-frequencies

**Answer : ****Option A**

**Explaination / Solution: **

Rectangular and cylindrical waveguide doesn’t support TEM modes and have cut off frequency. Coaxial cable support TEM wave and doesn’t have cut off frequency.

Rectangular and cylindrical waveguide doesn’t support TEM modes and have cut off frequency. Coaxial cable support TEM wave and doesn’t have cut off frequency.

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The return loss of a device is found to be 20 dB. The voltage standing wave ratio (VSWR) and magnitude of reflection coefficient are respectively

**A. ** 1.22 and 0.1

**B. ** 0.81 and 0.1

**C. ** – 1.22 and 0.1

**D. ** 2.44 and 0.2

**Answer : ****Option A**

**Explaination / Solution: **

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