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Control Systems

Control Systems
The Laplace transform of a transportation lag of 5 seconds is

 e-5s.
 1/(s+5).
 1/(s-5).
 e5s.

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Control Systems
Number of roots in left hand half of s plane if characteristic equation is s3 - 4s2 + s + 6 = 0 ?

 1.
 2.
 0.
 3.

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Control Systems
The device necessarily used for automatic temperature control in a furnace is

 Any of above.
 Thermostat.
 Thermocouple.
 Auto-transformer.

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Control Systems
A negative feedback closed loop control system is supplied to an input of 5 volt. The system has a forward gain of 1 and a feedback gain of 1. What is the output voltage?

  2.5 Volt.
 2.0 Volt.
 1.5 Volt.
  1.0 Volt.

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Control Systems
Transfer function of a control system depends on

 nature of output.
 system parameters alone.
 initial conditions of input and output.
 nature of input.

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Control Systems
Which of the following statements is/are true?

 both 1 and 2
 nether 1 nor 2
 Centroid may not be a part of root locus
 Centroid may be a part of root locus

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