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The extremely directional second signal sent by a VOR ground station generally rotates in a clockwise direction in space for about ________ times a second.

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The extremely directional second signal sent by a VOR ground station generally rotates in a clockwise direction in space for about ________ times a second.

(a) 30

(b) 3

(c) 50

(d) 5

I have been asked this question at a job interview.

My question is taken from Aviation Communication Systems in division Aviation Communication Systems of Aircraft Maintenance

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The correct option is (a) 30

Explanation: The extremely directional second signal sent by a VOR ground station, generally rotates in a clockwise direction in space for about 30 times a second. In order to propagate such signals, phased antenna arrays have to be used.

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