Control Systems Multiple Choice Questions and Answers Preparation for Competition exams pdf

1.    In an open loop control system
(a)    Output is independent of control input
(b)    Output is dependent on control input
(c)    Only system parameters have effect on the control output
(d)    None of the above
Ans: a

2.    For open control system which of the following statements is incorrect ?
(a)     Less expensive
(b)     Recalibration is not required for maintaining the required quality of the output
(c)    Construction is simple and maintenance easy
(d)    Errors are caused by disturbances
Ans: b

3.    A control system in which the control action is somehow dependent on the output is known as
(a)     Closed loop system
(b)     Semiclosed loop system
(c)     Open system
(d)     None of the above
Ans: a

4.    In closed loop control system, with positive value of feedback gain the overall gain of the system will
(a)    decrease   
(b)     increase
(c)     be unaffected    
(d)     any of the above
Ans: a

5.    Which of the following is an open loop control system ?
(a)     Field controlled D.C. motor
(b)    Ward leonard control
(c)    Metadyne   
(d)     Stroboscope
Ans: a

6.    Which of the following statements is not necessarily correct for open control system ?
(a)     Input command is the sole factor responsible for providing the control action
(b)     Presence of non-linearities causes malfunctioning
(c)    Less expensive
(d)    Generally free from problems of non-linearities
Ans: b

7.   In open loop system
(a)    the control action depends on the size of the system
(b)    the control action depends on system variables
(c)    the control action depends on the input signal
(d)    the control action is independent of the output
Ans: d

8    has tendency to oscillate.
(a)    Open loop system
(b)    Closed loop system
(c)    Both (a) and (b)
(d)    Neither (a) nor (b)
Ans: b

9.   A good control system has all the following features except
(a)     good stability   
(b)     slow response
(c)    good accuracy
(d)    sufficient power handling capacity
Ans: b

10.    A car is rtyining at a constant speed of 50 km/h, which of the following is the feedback element for the driver ?
(a)     Clutch   
(b)     Eyes
(c)    Needle of the speedometer
(d)    Steering wheel
(e)    None of the above
Ans: c

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