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Quiz: Transfer Function-LCS

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Number of Questions: 18

Question: 1 -

For a negative feedback system

 G(s)=(s+1)/s(s+2) ;  H(s)=(s+3)/(s+4) ; 

The equivalent transfer function is

Options:

  1. s(s+2)(s+4)/(s3+7s2+12s+3)

  2. (s+1)(s+4)/(s3+5s2+4s-3)

  3. s(s+2)(s+4)/(s+3)(s+5)

  4. (s+1)(s+4)/(s3+7s2+12s+3)

    5. Answer:

    (s+1)(s+4)/(s3+7s2+12s+3)
    Solution:

    G(s)H(s)=G(s)/1+G(s)H(s)

Question: 2 -

The equivalent transfer function of three parallel blocks

G1(s)= 1/(s+1), G2(s)= 1/(s+4), G3(s)= (s+3)/(s+5) is

Options:

  1. (s3+10s2+34s+37)/(s+1)(s+4)(s+5)

  2. (4s+1)/(s+1)(s+4)(s+5)

  3. (s3+10s2+37s+34)/(s+4)(s+5)

  4. (-s3-10s2+34s+37)/(s+1)(s-4)(s+5)

    5. Answer:

    (s3+10s2+34s+37)/(s+1)(s+4)(s+5)
    Solution:

    Ge(s) = G1(s) +G2(s) + G3(s)

Question: 3 -

The equivalent transfer function of three cascaded blocks

G1(s)= 1/(s+2), G2(s)= 1/(s+5), G3(s)= (s+1)/(s+3) is

Options:

  1.  (s+1)/(s+2)(s+3)(s+5)

  2. (10s2+34s-37)/(s+1)(s+4)(s+5)

  3. (s3+10s2+34s+37)/(s+1)(s+4)(s+5)

  4. (s3+10s2+34s-37)/(s+1)(s+4)(s+5)

    5. Answer:

     (s+1)/(s+2)(s+3)(s+5)
    Solution:

    G(s)= G1(s)G2(s)G3(s)

Question: 4 -

Consider the system shown in fig.

The input output relationship of this system is

Options:

  1. 1+G1+G2

  2. G1G2

  3. 1+G1G2

  4. 1+G2+G1G2

    5. Answer:

    1+G2+G1G2
    Solution not available.

Question: 5 -

A feedback control system is shown in fig. The transfer function for this system is

Options:

  1. G2G3/(1+H1G1G2)

  2. None of these

  3. G2G3/[G1(1+H1G2G3)]

  4. G1G2/(1+H1G2G3)

    5. Answer:

    G2G3/[G1(1+H1G2G3)]
    Solution not available.