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ANSWERS
MULTIPLE
CHOICE
1
2
TRUE OR
FALSE
3
11
4
12
5
13
6
14
7
15
8
9
10
TRUE OR FALSE
16
17
18
19
20
MULTIPLE CHOICE
1. . ………… Type of loop will be used
generally for the analysis.
[
]
a) Circle
b) Square
c) Triangle
d) Ellipse
MULTIPLE CHOICE
2. In the θ direction ……….Field will exists for
loop antennas.
[
]
a) Electric
b) Magnetic
c) Both Electric&Magnetic
d) No field
MULTIPLE CHOICE
3. The radiation resistance of folded dipole
of equal radii is---------[
]
a) 657 Ohms.
b) 292 Ohms.
c) 300 Ohms.
d) 277 Ohms.
MULTIPLE CHOICE
4. The radiation resistance of folded dipole
of unequal radii (r2=2r1) is---------[
]
a) 657 Ohms.
b) 292 Ohms.
c) 300 Ohms.
d) 277 Ohms.
MULTIPLE CHOICE
5. The helix is having the geometry of --------[
]
a) Straight wire.
b) Circle.
c) Cylinder.
d) All above.
MULTIPLE CHOICE
6. The radiation pattern of helical antenna in
Axial mode is----------[
]
a) Bi directional.
b) Unidirectional.
c) 4 lobed.
d) Omni directional.
MULTIPLE CHOICE
7. The radiation pattern of helical antenna in
Normal mode is----------[
]
a) Bidirectional.
b) Unidirectional.
c) 4 lobed.
d) Omni directional.
MULTIPLE CHOICE
8. In Normal mode of operation the length
of the helix is------------[
]
a) >λ.
b) <λ.
c) =λ.
d) None.
MULTIPLE CHOICE
9. In Axial mode of operation the length of
the helix is------------[
]
a) >λ.
b) <λ.
c) =λ.
d) None.
MULTIPLE CHOICE
10. Horn antennas are used in the frequency
range of---------[
]
a) VHF.
b) UHF.
c) SHF.
d) MW.
TRUE OR FALSE
11. Yagi_Uda array is a parasitic array.
[
]
TRUE OR FALSE
12. The reflector is longer than the folded
dipole in Yagi-Uda antenna.
[
]
TRUE OR FALSE
13. The director is shorter than the Folded
dipole in Yagi-Uda antenna.
[
]
TRUE OR FALSE
14. Stone invented Helical Antenna.
[
]
TRUE OR FALSE
15. Mushaike invented Horn antenna.
[
]
FILL IN THE BLANKS
16. Radiation pattern of Yagi-Uda array is
-------------directional
FILL IN THE BLANKS
17. Helical antenna was invented by
-------------
FILL IN THE BLANKS
18. The far field pattern of helical antenna
is--------------- of no. of turns.
FILL IN THE BLANKS
19. If the opening or flaring is done only in
one plane then ---------------horn will be
produced.
FILL IN THE BLANKS
20. If the opening or flaring is done in both
E and H planes then ---------------horn will
be produced.
ANSWERS
MULTIPLE
CHOICE
1
B
2
D
3
B
11
TRUE
4
A
12
TRUE
5
D
13
TRUE
6
B
14
FALSE
7
A
15
FALSE
8
B
9
C
10
D
TRUE OR
FALSE
TRUE OR FALSE
16 unidirectional
17 John.d.krauss
18 independent
19 sectorial
20 pyramidal