ECIL GET 2018 Recruitment: Electronics (Control Systems) Quiz 4

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Question 1

A system is critically damped. Now if the gain of the system is increased the system will behave as

• Aunderdampled
• Boscillatory
• Ccritically damped
• DNone of the above

Question 2

Regenerative feedback implies

• Afeedback with negative sign
• Bfeedback with positive sign
• Cfeedback with step input
• Dfeedback with oscillations

Question 3

For a unity feedback system with an open-loop transfer function, the resonant peak output M_m and the corresponding resonant frequency ω_m are respectively

• A2.6 and 2.64 rad/sec
• B1.04 and 2.645 rad/sec
• C2.6 and 4.8 rad/sec
• D1.04 and 4.8 rad/sec

Question 4

A unity feedback system has open-lop poles at s = -2±j2, s = -1  and s = 0 and a zero at s = -3. What are the angles made by the rootloci asymptotes with the real axis?

• A60 °, 180^o and –60^o
• B30^o, 90^o and 60^o
• C60^o, 120^o and –30^o
• D30^o, 60^o and 180^o

Question 5

In control system, phase delay t_p be calculated using:

• Atp = Φ/ω
• Btp = ω/ Φ
• Ctp = ω - Φ
• Dtp = Φ - ω

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