Parameter that determines lowest signal reception capability of a receiver is
Explanation: Sensitivity is the ability to receive weak signals.
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194 matching questions
TRF stands for
Explanation: TRF means Tuned Radio Frequency.
If a super hetero dyne radio receiver is tuned to 1255 KHz & the IF frequency is 455KHz, then the frequency of the local oscillator of the receiver is
Explanation: For a conventional high-side oscillator, LO = 1255 + 455 = 1710 kHz.
Among all these materials, which one has poor conductivity ?
Explanation: Silicon is a semiconductor and conducts much less readily than the listed metals.
A magnet does not attract which one in the following
Explanation: Aluminium is not ferromagnetic; nickel, iron and cobalt are attracted by a magnet.
The expanded form for ‘LDR’ is
Explanation: LDR means Light Dependent Resistor.
The high frequency band (HF) is
Explanation: The HF band extends from 3 MHz to 30 MHz.
If a small value of inductance is connected in parallel with a large value, the combined inductance will be
Explanation: For inductors in parallel, the equivalent inductance is lower than the smaller inductance (for ideal uncoupled inductors).
A domestic inverter
Explanation: A domestic inverter converts DC from a battery into AC.
The tolerance bands with colors gold, silver & brown represent
Explanation: Gold, silver and brown tolerance bands represent 5%, 10% and 1%, respectively.
India uses which encoding technique for commercial TV broad cast
Explanation: India’s analogue terrestrial television system used PAL.
The video bandwidth in a TV transmission in India is
Explanation: The conventional Indian PAL-B/G television system used approximately 5.5 MHz sound spacing and 5 MHz channel characteristics; the stated video bandwidth answer in this legacy question is 4.2 MHz.
For mobile communications, the up-link frequency is _____ down link frequency .
Explanation: In typical cellular systems, the mobile uplink frequency is higher than the downlink frequency.
All India Radio (AIR) does not broadcast
Explanation: Pulse modulation is not a normal broadcast mode used by All India Radio.
Geo stationary orbit is ___ km away from the earth
Explanation: A geostationary orbit is approximately 35,786 km above the Earth’s equator.
Digital modulation techniques are
Explanation: Phase-shift keying (PSK) is a digital modulation technique.
The following idle component dissipates energy
Explanation: A resistor dissipates electrical energy as heat; ideal capacitors and inductors do not dissipate average real power.
The most common stage used for amplifying an electrical signal is
Explanation: The common-emitter configuration is widely used for voltage amplification.
The ideal value of ripple factor should be
Explanation: An ideal rectifier output has zero ripple; hence the ideal ripple factor is zero.
The following modulation is used for audio transmission in TV broadcast
Explanation: FM is used for television sound broadcasting in the conventional analogue system.