Easy Communications Questions – Electrical Engineering (Page 2)

#21📘 reviewer_appEasy

Which of the following is not normally tested in a transmitter?

APower

BModulation

CFrequency

DAmplitude

#22📘 reviewer_appEasy

Which of the following items need not to be checked with receivers?

ASensitivity

BSquelch

CDistortion

DGain

#23📘 reviewer_appEasy

What is the source of wheel static?

AWheel

BBrakes

CPiston

DOscillations

#24📘 reviewer_appEasy

A _____ is a resonant circuit tuned to reject an undesired signal by reducing the gain at the trap frequency

ALC tank

BLPF

CWave trap

DHPF

#25📘 reviewer_appEasy

The modulation system used for telegraphy is

Afrequency-shift keying

Btwo-tone modulation

Cpulse-code modulation

Dsingle-tone modulation

#26📘 reviewer_appEasy

Refers to an emission designation for facsimile?

AJ3E and F4E

BA3J and A4E

CA3E and F3C

DR3E and A3E

#27📘 reviewer_appEasy

Which causes a quantization noise in PCM system?

ASerial transmission errors

BThe approximation of the quantized signal

CThe synchronization between encoder and decoder

DBinary coding techniques

#28📘 reviewer_appEasy

Unwanted radio signal on assigned frequency.

ASplatter

BRFI

CNoise

DEMI

#29📘 reviewer_appEasy

________ is measured on a circuit when it is correctly terminated but does not have any traffic.

AWhite noise

BGalactic noise

CImpulse noise

DAtmospheric noise

#30📘 reviewer_appEasy

Which standard recommends crosstalk limits?

ACCITT G. 152

BCCITT G. 150

CCCITT G. 151

DCCITT G. 161

#31📘 reviewer_appEasy

Which standard is utilized in intermodulation noise rates on PCM audio channels?

ACCITT Rec. G. 151

BCCITT Rec. G. 172

CCCITT Rec. G. 190

DCCITT Rec. G. 190

#32📘 reviewer_appEasy

What is the reference frequency of CCITT psophometric noise measurement?

A800 Hz

B1000 Hz

C1500 Hz

D3400 Hz

#33📘 reviewer_appEasy

Industrial noise frequency is between ________________.

A0 to 10 kHz

B160 MHz to 200 MHz

C15 to 160 MHz

D200 to 3000 MHz

#34📘 reviewer_appEasy

External noise fields are measured in terms of ____________.

Arms values

Bdc values

Caverage values

Dpeak values

#35📘 reviewer_appEasy

Form of interference caused by rain or dust storms.

APrecipitation static

BShot-noise

CGalactic noise

DImpulse noise

#36📘 reviewer_appEasy

A large emission of hydrogen from the sun that affects communications.

ASolar flare

BCosmic disturbance

CBallistic disturbance

DSolar noise

#37📘 reviewer_appEasy

Atmospheric noise or static is not a great problem

Aat frequencies below 20 MHz

Bat frequencies below 5 MHz

Cat frequencies above 30 MHz

Dat frequencies above 1 MHz

#38📘 reviewer_appEasy

What is the proper procedure for suppressing electrical noise in a mobile station?

AApply shielding and filtering where necessary

BInsulate all plain sheet metal surfaces from each other

CApply anti-static spray liberally to all nonmetallic

DInstall filter capacitors in series with all dc wiring

#39📘 reviewer_appEasy

15 dBa F1A weighted, equals __________.

A-90 dBm

B-82 dBm

C-85 dBm

D-70 dBm

#40📘 reviewer_appEasy

A measurement of -75 dBm, C-message weighted, would be ____________ dBrnc.

A8

B7

C9

D15

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