MODEL ASOL QUESTION PAPER 2007 ORISSA
~~~~~~~~ Courtesy VU2LFA ~~~~~~~~
MINISTRY OF COMMUNICATION AND IT
DEPARTMENT OF TELECOMMUNICATIONS
WIRELESS MONITORING
ORGANIZATION, GOVERNMENT OF
ASOC EXAMINATION GRADE I & II
Centre : Date :
Time : Grade I - 2 hours Max. Marks : 100
Grade II and Grade II (Rest.) - 1 hour
Instructions
1. Do not write on the question paper. Return it along with the answer booklet.
2. Question no 1 & 9 are compulsory for both Grade I and Grade II candidates.
3. Grade I candidates have to answer 6 questions from each section including the compulsory question (1+5)
4. Grade I candidates have to answer 3 questions from each section including the compulsory question (1+2)
Section A
1.
a. The unit of specific resistance is ohm meter
b. The power consumption by a bulb is 60 w and it is rated at 240V. What is the current drawn by the bulb when it is lit?
c. The equivalent resistance when two resistors or 57 KW & 39 KW are connected in series is
d. Name the electrodes of a triode .., &
e.
The frequency of crystal Oscillator depends on
1. Length 2. Weight 3.Thicknes 4. None
f. In a step down transformer, the primary has more/less/equal number of turns than the secondary winding.
g. In AM radio receiver is tuned to 1045 KHz. If the IF frequency is 455 KHz. What is the frequency of the local oscillator of the receiver?
h. Power output of 10dbm is equal to watt.
i. The majority charge carriers in P type semiconductor are
1. Neutrons 2. Protons 3.Electrons 4. Neutrons
j. The power dissipation in an idle capacitor of 4.7 micro farad, when 250 volt is applied across it is .
2. Draw the diagram of a bridge rectifier. What are the advantages & Disadvantages of a bridge rectifier over a full wave rectifier?
3. Explain with the help of a block diagram the working of a low power AM transmitter. Also describe in brief the working principal of a speaker.
4. Distinguish between TRF and Super Hetrodyne Receiver. What is the function of BFO in communication receiver?
5. Describe with the help of a circuit diagram, how a colpitts Oscillator works and what factors determine the ability of above oscillators.
6. Describe the various layers of ionosphere. What is meant by critical frequency and MUFrequency? What is the relation between them?
7. Draw the block diagram of a frequency meter and explain its function briefly.
8. write short notes on any three of the following:
a. Skin Effect
b. Extra terrestrial noise.
c. Band pass filter
d. Yagi Uda antenna
SECTION-B
9.
a. The nomenclature CF3 is the context of type of modulation stand for
b. Phonetic alphabet of K is ..
c. The Q code QSV stand for .
d. Expand the abbreviation RST .
e. SACFA stand for .............
f. Phonetic alphabet of K is ..
g.
The minimum age to become an Amateur License in
h.
The maximum permitted power for grade II amateur on HF
band is
.
i. Represent a bandwidth of 3.6khz in radio format.
j. Expand the abbreviation RST .
10.
Name the frequency bands authorized to grade I & II amateurs in
11. Draw the specimen log sheet with at least three entries and explain each column briefly.
12. What is an Amateur Station? What are the rules regarding the secrecy of correspondence?
1. What is Distress Signal? What should an Amateur do when he receives such signal?
2. What procedure should be followed by an Amateur for importing radio communication equipment?
3. What is the use of standard frequency & time services in the world to a radio amateur? Give two examples of such services.
4. write short notes on any three of the following:
a. Urgency Signal
b.
International Telecommunication
c. Standard frequency & Time station
d. SINPO