Explore topic-wise MCQs in Engineering.

The noise sources shot noise, partition noise and thermal noise are associated with which component

Leak type bias is used in a plate-modulated class C amplifier to

FM broadcast is done using

Consider the following statements as regards communication receiver

1. Variable sensitivity is used to eliminate selective fading
2. A product demodulator can be used to receive Morse code
3. The noise limiter cuts off receiver output during a noise pulse
4. Double conversion is used to improve image rejection

The power rating of radio transmitters is around

Narrowband FM signal can be considered to be equal to

The PAM Signal can be detected by

FM is named so because

On a smooth surface, the line of sight distance between transmitting antenna (height h_t metres) and receiving antenna (height h_r metres) is about

In radio receivers, the value of IF is

In FM, increased depth of modulation increases

Which stage generates RF carrier?

In Modulation, "carrier" is

Which one of the following blocks is not common in both AM and FM receivers?

If the variance _x² of d(n) = x(n) - x(n - 1) is one-tenth the variance _x² of a stationary zero mean discrete time signal x(n), then the normalized autocorrelation function R_xx(x)/ _x² at k = 1 is

Which of the following frequency is likely to be associated with AM radio broadcast?

In which of the following schemes are several channels interleaved and transmitted together?

One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

If carrier modulated by a digital bit stream had one of the possible phases of 0 , 90 , 180 , 270 , then the modulation is called.

In FM, when the bandwidth is doubled, the signal to noise ratio improves by a factor of

The audio frequency range is

Pilot-carrier transmission is one in which

The number of spectral component when two sine wave of same frequency multiplied is

AM-SC stands for

FM has poor efficiency than

The tuned circuit of the oscillator in a simple AM transmitter employs a 50 H coil and a 1 nanofarad capacitor. If the oscillator output is the carrier frequency will be

Public address systems generally use electret microphones.

The noise at the input to an ideal frequency detector is white. The detector is operating above threshold. The power spectral density of the noise at the output is

As regards BCH code, Hamming code and Reed-Solomon code

In a low level AM system, the amplifier which follows the modulated stage must be the

In a square law modulator, the carrier frequency should be __________ times than the highest modulating frequency.

CSSB stands for

In a PCM the amplitude levels are transmitted in a 7 unit code. The no. of levels is

Tropospheric scatter is used with frequencies in the range of

Which of the following is not advantage of FM over AM?

In single tone FM discriminator (S₀/N₀) is

In high power AM transmission modulation is done at

Which one of the following gives maximum probability of error?

A direct radiating cone type loudspeaker attenuates :

The advantage of pulse modulation is

Sparking affects amplitude modulation.

For low impedance SAW filter the most suitable material for substrate of SAW filter is

Which of the following is an indirect method of generating FM?

Entropy gives

Quantization noise occurs in

An angle modulated signal is expressed by f_a(t) = cos (2 x 10⁸ pt) + 75 sin (2 x 10³ pt). The peak frequency deviation of the carrier is

PIL tube means

What is the frequency of audio modulation?

Armstrong modulator generates

The diagonal clipping in Amplitude Demodulation using (envelope detector) can be avoided if R_c time constant of the envelope detector satisfies the following condition here is message bandwidth and _c is carrier frequency both in rad sec,