Electrical Engineering Mcqs

In TV transmission, picture signal is ______________ modulated?

• (A)  Frequency
• (B)  Phase
• (C)  Amplitude
• (D)  None of the above

Answer

Submitted By :Ali Uppal

In a radio receiver, noise is generally developed at _______________?

• (A)  IF stage
• (B)  Receiving antenna
• (C)  Audio stage
• (D)  RF stage

Answer

Submitted By :Ali Uppal

The signal voltage induced in the aerial of a radio receiver is of the order of ________________?

• (A)  mV
• (B)  µV
• (C)  V
• (D)  None of the above

Answer

Submitted By :Ali Uppal

Most of the amplification in a superhetrodyne receiver occurs at ______________stage?

• (A)  IF
• (B)  RF amplifier
• (C)  Audio amplifier
• (D)  Detector

Answer

Submitted By :Ali Uppal

If a radio receiver amplifies all the signal frequencies equally well, it is said to have high ________________?

• (A)  Sensitivity
• (B)  Selectivity
• (C)  Distortion
• (D)  Fidelity

Answer

Submitted By :Ali Uppal

The letters AVC stand for ________________?

• (A)  Audio voltage control
• (B)  Abrupt voltage control
• (C)  Automatic volume control
• (D)  Automatic voltage control

Answer

Submitted By :Ali Uppal

In superhetrodyne receiver, the input at mixer stage is________________?

• (A)  IF and RF
• (B)  RF and AF
• (C)  IF and AF
• (D)  RF and local oscillator signal

Answer

Submitted By :Ali Uppal

When the modulating signal controls the frequency of the carrier, we get______________?

• (A)  Phase modulation
• (B)  Amplitude modulation
• (C)  Frequency modulation
• (D)  May be any one of the above

Answer

Submitted By :Ali Uppal

The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is _______________?

• (A)  455 kHz
• (B)  1310 kHz
• (C)  1500 kHz
• (D)  1520 kHz

Answer

Submitted By :Ali Uppal

A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor ?

• (A)  3
• (B)  6
• (C)  5
• (D)  None of the above

Answer

Submitted By :Ali Uppal