radio theory q

8/16/2019 Radio Theory Q

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RADIO

Q.1 Why is an X band weather radar used rather than a C band?

a. The C band critical ray is too small.

b. The C band sy ray is too wea.c. C band wa!elen"th is too lon".

d. The C band re#lected ray is too wea.

Q.$ What is the #irst returnin" sy wa!e called?

a. The critical ray.

b. The syray

c. The s%ace wa!e.

d. The "round wa!e.

Q.& When dose the ma'imum #adin" o# an () wa!e occur?

a. When the wa!es are more than *+ de"rees out o# %hase. b. When the wa!es are *+ de"rees out o# %hase.

c. When the wa!es are in %hase.

d. When the wa!es are 1,+ de"rees out o# %hase.

Q.- What is the metric distance o# an D/ wa!elen"th?

a. Decimetric.

b. Centimetric.

c. 0etric.

d. 0etric o# ilometric

Q.2 Which radio #re3uency em%loys the re#raction %ro%erties o# the

ionos%here?a. 4().

b. ()

c. 5().

d. 6()

Q.7 5OR wa!elen"th is?

a. $.-7 Cm.

b. $-.7 Cm.

c. $.-7m.

d. $-.7 mQ.8 5OR wa!elen"th is

a. 0illimetric.

b. Centimetric

c. Decemetric

d. 0etric.

Q., When is #adin" in the medium #re3uency band most liely to occur


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a. Durin" the day with "round and sy wa!es.

b. Durin" rainy days.

c. Durin" the ni"ht with "round and sy wa!es.

d. Durin" rainy ni"hts

Q.* What is the wa!elen"th and wa!eband o# a radio aid that uses a

#re3uency o# 1* Cm.

a. 12.8* (9. 4:).

b. 12.8* h9. 5:).

c. 1.28* 0h9 5()

d. 1.28* ;h9. 6()

Q.1+ )adin" is "reatest

a. O!er land durin" the day.

b. O!er land at ni"ht.

c. O!er the sea durin" the day.

d. O!er the sea at ni"ht.Q.11 The wa!elen"th o# a 1$1.*2 0(9 si"nal is?

a. $-.7 Cm.

b. $.-7 m.

c. $-.7 m.

d. $.-7 m.

Q.1$ What is si% distance?

a. The distance between a recei!er and the #irst and second

#undamentals.

b. The distance between the transmitter and the #irst returnin" sy wa!e.

c. The distance between the recei!er and the #irst returnin" #undamental.

d. The distance between the #irst #undamental returnin" to the "round<

and the recei!er.

Q.1& The si% distance is increased by =========== the wa!elen"th and

=========the #re3uency?

a. Decreasin". Decreasin".

b. Decreasin". Increasin".

c. Increasin". Increasin".

d. Increasin". Decreasin".

Q.1- The wa!elen"th o# () is?a. Centimetric

b. Decemetric.

c. 0etric.

d. ilometric.

Q.12 Weather radar is?

a. Centimetric


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b. Decimetric

c. 0etric.

d. ilometric

Q.17 AD) uses the ============= #re3uency?

a. 1*+ to 182+ (9.

b. 1*+ to 182+ (9.

c. 1*+ to 182+ 0(9.

d. 1*+ to 182+ ;(9.

Q.18 The wa!elen"th o# 5() radio si"nal is?

a. 0illimetric.

b. Centimetric

c. Decimetric.

d. 0etric.

Q.1, The wa!elen"th o# I : > is.

a. 0illimetric. b. Centimetric.

c. Decimetric.

d. 0etric.

Q.1* What is the wa!elen"th o# a $-& 0(9 radio si"nal.

a. 1$&.- Cm.

b. 1$.&- Cm.

c. 1.$&- m.

d. 1$.&- m.

Q.$+ What is the #re3uency o# a *2+2 Cm radio wa!e.

a. &.1- 0(9.

b. &1.- 0h9.

c. &1.- ;9.

d. &1- 0(9.

Q.$1 The least attenuation o# a sywa!e is liely to occur at?

a. 0idni"ht and hi"h #re3uency.

b. 0idday and hi"h #re3uency.

c. 0idni"ht and low #re3uency.

d. 0idday and low #re3uency.

Q.$$ An 4:T is ca%able o# transmittin" between?a. 1$1.2 and 0(9 #or $- hours at a tem%erature o# =$2o C.

b. 1$1.2 and 0(9 #or -, hours at a tem%erature o# =$+o C.

c. 1++ and 0(9 #or $- hours at a tem%erature o# =$+o C.

d. 1++ and 0( #or -, hours at a tem%erature o# =$2o C.

Q.$& Atmos%heric ductin" close to the earth< is most liely?

a. In an in!ersion with constant humidity at all altitudes.


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b. In an in!ersion with humidity decreasin" with increasin" altitude.

c. O!er land.

d. O!er the sea.

Q.$- The /)O in an AD)?

a. @roduces a si"nal that di##ers #rom the recei!ed si"nal by

a%%ro'imately $ (9.

b. @roduces a $ (9 si"nal.

c. 0inimise static inter#erence.

d. To identi#y beacons when the si"nals are !ery wea.

Q.$2 What is the #re3uency band and wa!elen"th o# a - ;(9 radio si"nal?

a. 82 mm. 4()

b. 8.2 cm 6().

c. 8.2 cm >().

d. 82 cm. 5(.

Q.$7 Di##raction o# radio wa!es?a. Increases with increasin" #re3uency.

b. Decreases with increasin" #re3uency.

c. Is constant at all #re3uencies.

d. 5aries with latitude< but not with lon"itude.

Q.$8 >ywa!es at day or ni"ht are least liely with?

a. 5:).

b. :).

c. ().

d. 5().

Q.$, The o%timum () #re3uency %uts the recei!er?

a. ust inside the minimum si% distance.

b. ust outside the minimum si% distance.

c. ust within the sur#ace wa!e co!era"e area.

d. ust outside the sur#ace wa!e co!era"e area.

Q.$* >ur#ace wa!e ran"e?

a. Decreases with increasin" #re3uency.

b. Is inde%endent o# #re3uency.

c. Decreases with decreasin" #re3uency.

d. Increases with increasin" am%litude.Q.&+ :oran o%erates is the?

a. () band at &++ m wa!elen"th and 12+ h9 #re3uency.

b. :) band at &+++ m wa!elen"th and 1++ h9 #re3uency.

c. 5:) band at &++++ m wa!elen"th and 1++ (9 #re3uency.

d. :) band at &2++ m wa!elen"th and 1++ h9 #re3uency.

radio theory q

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