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MCQs

Total Questions : 19 | Page 1 of 2 pages
Question 1. For the first order system having Transfer system 1/(1-sT),the unit impulse response is
  1.    e "“t/T
  2.    T e "“t/T
  3.    (1/T) * e t/T
  4.    T2 e "“t/T
 Discuss Question
Answer: Option C. -> (1/T) * e t/T


The response is ₤-1 [1/(1-sT)]=[(1/T)/(s-1/T)]= (1/T) * e t/T


Question 2. As compared to a Closed loop system an Open loop system is
  1.    More stable as well as more accurate
  2.    Less stable as well as less accurate
  3.    More stable but less accurate
  4.    Less stable but more accurate
 Discuss Question
Answer: Option C. -> More stable but less accurate


None.


Question 3. Signal flow graph is used to find _________
  1.    Stability of the system
  2.    Controllability of the system
  3.    Transfer function of the system
  4.    Poles of the system
 Discuss Question
Answer: Option C. -> Transfer function of the system


None.


Question 4. Phase margin of a system is used to specify
  1.    Relative stability
  2.    Absolute Stability
  3.    Time Response
  4.    Frequency response
 Discuss Question
Answer: Option A. -> Relative stability


None.


Question 5. Gain cross - over frequency is defined as
  1.    |G(jω)H(jω)|=1
  2.    |G(jω)H(jω)|=0
  3.    |G(jω)H(jω)|=∞
  4.    |G(jω)H(jω)|=1/2
 Discuss Question
Answer: Option A. -> |G(jω)H(jω)|=1


A Gain cross - over frequency is defined as
|G(jω)H(jω)|=1 & solve for ω=ωg


Question 6. Which one of the following is an example of open “ loop system
  1.    A windscreen wiper
  2.    Respiratory system of an animal
  3.    A system for controlling anti-rocket missiles
  4.    None of these
 Discuss Question
Answer: Option A. -> A windscreen wiper


None.


Question 7. The principles of Homogeneity & Superposition are applied to
  1.    Linear Time Variant Systems
  2.    Non - Linear Time Variant Systems
  3.    Linear Time Invariant Systems
  4.    Non - Linear Time Invariant Systems
 Discuss Question
Answer: Option C. -> Linear Time Invariant Systems


None.


Question 8. A unity feedback system has Open loop Transfer system (s+1), Then Closed loop Transfer function is
  1.    s+1
  2.    s-1
  3.    s-1/s+3
  4.    s+1/s+2
 Discuss Question
Answer: Option D. -> s+1/s+2


Open loop Transfer system = (s+1)Closed loop Transfer function = s+1/1+(s+1)*1=s+1/s+2


Question 9. A unity feedback system has Open loop Transfer system s/(s+1), Then Closed loop Transfer function is
  1.    s/2s+1
  2.    s/s+1
  3.    2s/s+2
  4.    s/s+2
 Discuss Question
Answer: Option A. -> s/2s+1


Open loop Transfer system = s/(s+1)Closed loop Transfer function = (s/s+1)/1+(s/(s+1)*1)=s/s+1+s=s/2s+1


Question 10. A unity feedback system has Open loop Transfer system (s2+1), Then Closed loop Transfer function is
  1.    s+1
  2.    s-1
  3.    s-1/s+3
  4.    s2+1/ s2+2
 Discuss Question
Answer: Option D. -> s2+1/ s2+2


Open loop Transfer system = (s2+1)
Closed loop Transfer function =(s2+1)/ 1+(s2+1)= (s2+1)/ (s2+2)


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