One Stop GATE Forum: Electromagnetics

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Que. 1      distance near the skip distance should be used for sky-wave propogation
A         to avoide the faraday effect
B         to avoide tilting
C         To prevent sky-wave and upper ray interface
D         so as to exceed the critical freq.

Que. 2     in air a lossless transmission line of length 50cm with L=10micro H/m,C=40pF/m 
is operated at 25Mhz its electrical path length is
A         0.5meter
B         lemda meters
C         (pi)/2 radians
D         180 degree

Que. 3     A coil has an inductance of 1H. If a current changing @ 1A/secs
A         induces 1v in another coil
B         causes a back emf of1v
C         causes a aiding emf of1v
D         causes transformer action

Que. 4     A parabolic dish antenna with a effenciency of 55% and an operating freq. 
of 10Ghz has a gain of 43.82dB.Its diameter is
A         1m
B         2m
C         4m
D         8m

Que. 5     Which of the following represents 'E3(16)   '?
A         (1 CE)  + (A2)
                  16      16
B         (1 BC)   +  (DE)
                  16       16
C         (2 BC) - (1 DE)
                 16        16
D         (200)  - (11 D) 
                16        16

Que. 6     The charecteristic impedance of a transmission line with inductance 0.294 
micro H/m.and capacitance 60 pF/m is
A         49 W
B         60 W
C         70 W
D         140 W

Que. 7     The circles on the Smith chart
A         represents normalised constant resistance or conductance
B         represents normalised constant reactance or susceptance
C         are constant SWR circles
D         are connected 'p'circles

Que. 8     In  a parasitic array,
A         Only one of the element is driven, the others get excitation 
from the field                produced
B         all the elements of the array are the driven elements
C         there are more than one directors
D         there is one driven elemnts one director and one reflector

Que. 9     In H-plane metal plate lens antenna travelling wave fronts
A         totally retarded
B         retarded
C         accelerated
D         neither accelerated nor retarted
Que. 10     The type of antenna to be used for produceing circulary polarised beams 
is
A         pyramidal horn
B         log-perodic array
C         paraboloid
D         helical antenna

Author	Message
Neha Agarwal Groupie Joined: 04Jan2007 Online Status: Offline Posts: 59	Topic: Electromagnetics - GATE Sample qns Posted: 13Feb2007 at 5:34pm
	Que. 1 distance near the skip distance should be used for sky-wave propogation A to avoide the faraday effect B to avoide tilting C To prevent sky-wave and upper ray interface D so as to exceed the critical freq. Que. 2 in air a lossless transmission line of length 50cm with L=10micro H/m,C=40pF/m is operated at 25Mhz its electrical path length is A 0.5meter B lemda meters C (pi)/2 radians D 180 degree Que. 3 A coil has an inductance of 1H. If a current changing @ 1A/secs A induces 1v in another coil B causes a back emf of1v C causes a aiding emf of1v D causes transformer action Que. 4 A parabolic dish antenna with a effenciency of 55% and an operating freq. of 10Ghz has a gain of 43.82dB.Its diameter is A 1m B 2m C 4m D 8m Que. 5 Which of the following represents 'E3(16) '? A (1 CE) + (A2) 16 16 B (1 BC) + (DE) 16 16 C (2 BC) - (1 DE) 16 16 D (200) - (11 D) 16 16 Que. 6 The charecteristic impedance of a transmission line with inductance 0.294 micro H/m.and capacitance 60 pF/m is A 49 W B 60 W C 70 W D 140 W Que. 7 The circles on the Smith chart A represents normalised constant resistance or conductance B represents normalised constant reactance or susceptance C are constant SWR circles D are connected 'p'circles Que. 8 In a parasitic array, A Only one of the element is driven, the others get excitation from the field produced B all the elements of the array are the driven elements C there are more than one directors D there is one driven elemnts one director and one reflector Que. 9 In H-plane metal plate lens antenna travelling wave fronts A totally retarded B retarded C accelerated D neither accelerated nor retarted Que. 10 The type of antenna to be used for produceing circulary polarised beams is A pyramidal horn B log-perodic array C paraboloid D helical antenna
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