निम्न सिग्नल की अवधि क्या है?

x(t) = 10 sin 12πt + 4 cos 18πt 

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ESE Electronics 2012 Paper 1: Official Paper
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  1. π/4
  2. 1/6
  3. 1/9
  4. 1/3

Answer (Detailed Solution Below)

Option 4 : 1/3
Free
ST 1: UPSC ESE (IES) Civil - Building Materials
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संकल्पना:

यह जांचने के लिए कि सिग्नल का संयोजन आवधिक है या नहीं, हमें अलग-अलग समय अवधि का अनुपात लेना होगा, यदि अनुपात तर्कसंगत है तो संयुक्त सिग्नल आवधिक है अन्यथा यह आवधिक नहीं है, और अवधि अलग-अलग अवधियों के LCM के बराबर होगी।

विश्लेषण:

x(t) = 10 sin 12πt + 4cos 18πt

x(t) = x1(t) + x2(t) 

x1(t) = 10 sin 12πt

ω1 = 12π 

T1 = 2π/ω1 = 1/6

x2(t) = 4 cos 18πt 

ω= 18π 

T2 = 2π/ω2 = 1/9

यह जांचने के लिए कि संयुक्त सिग्नल आवधिक है या नहीं:

चूंकि अनुपात तर्कसंगत है, इसलिए संयुक्त सिग्नल आवधिक है।

समयावधि = LCM {1/6, 1/9}

= = 1/3

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