Explore topic-wise MCQs in Engineering.

What is the RF amplifier plate voltage when the audio-modulating voltage is +600 V?

FM has

The service area of a TV transmitter is a little beyond radio horizon.

A radio frequency signal contains the following three frequencies :
850 kHz; 865 kHz and 875 kHz
In order to amplify this signal, which of the following amplifier should be selected?

Bit is a unit of

In pulse transmitter the ratio of time on to time off is called

In figure the output v(t) is

A MASER is a

Transit time is considered as significant at

In a colour TV receiver, AGC adjusts the gain of

In VCR the luminance signal is recorded by

Assertion (A): In digital communication data is coded prior to being transferred.

Reason (R): A number of codes for digital data processing are available.

In FM modulation pre-emphasis is done for

c(t) and m(t) are used to generate an AM signal. The modulation index of the generated AM signal is 0.5 then the quantity
is

High intermediate frequency in a superheterodyne receiver

In FSK no synchronous carrier is needed at the receiver

In AM, if modulation index is more than 100%, then

The constellation diagram of a modem has four states as shown in the figure given below. What is the bit rate of this modem?

When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant. The modulation system is

Vividh Bharti programme is transmitted in

The width of air gap on recording head in a tape recorder is about

In a stereo tape recorder the speed of the tape is

Which of the following refers to SSB suppressed carrier amplitude modulated system?

Present day stereophonic systems have

If e = 10 sin(10⁸ t + 3 sin 10⁴ t) then carrier frequency is

RF choke used for suppressing interference in TV is generally

Indicate the false statement: To combat noise

Thermal noise is independent of

The frequency at which the piezoelectric effect occurs is primarily determined by

Audio and video signals are called modulating waves.

In home tape recorders the tape width is 2 inches.

The decorative lighting works on the principle of

In an oscillator crystal, the parallel resonant frequency is

The highest modulating frequency typically used in AM systems is

The line of sight communication requires the transmit and receive antennas to face each other. If the transmit antenna is vertically polarized, for best reception to the receive antenna should be

Which of the following statement regarding the advantages of the phase discriminator over the slope detector is false?

The maximum range of a radar is proportional to

The bandwidth of FM for Commercial Purpose is

In FM, the frequency deviation is

Speech amplifiers are usually operated as

In MF range, increasing the transmitter power

SSB-SC stands for

The most frequent users of long distance VLF transmission is

BFO stands for

A lens has a hyperfocal distance of 7.5 m. It is focused at 7.5 m. Then

In which frequency range is the noise figure in a transistor independent of frequency

The frequency tolerance for the RF carrier in the standard AM radio broadcast band is

Which of the following is likely to be associated with FM radio broadcasting?

In a 4-ary FSK, the frequencies are separated by f_s. Then they are

In cell communication, cell stands for