Machine Dynamics Mcqs

Q:

A control system working under unknown random actions is called

A) computer control system B) digital data system
C) stochastic control system D) adaptive control system
 
Answer & Explanation Answer: C) stochastic control system

Explanation: Adaptive control is the control method used by a controller which must adapt to a controlled system with parameters which vary, or are initially uncertain. Stochastic control system is a control system working under unknown random actions.

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123
Q:

The initial response when the output is not equal to input is called

A) Transient response B) Error response
C) Dynamic response D) None of the mentioned
 
Answer & Explanation Answer: A) Transient response

Explanation: Transient response of control system means changing so, this occurs mainly after two conditions and these two conditions are
1. Just after switching ‘on’ the system that means at the time of application of an input signal to the system.
2. Just after any abnormal conditions. Abnormal conditions may include sudden change in the load, short circuiting etc.

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149
Q:

A car is running 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
 
Answer & Explanation Answer: C) Needle of the speedometer

Explanation: The needle of the speedometer is only the indicator of the speed and to keep the speed constant, the driver has to maintain the speed of 50 km/h.

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207
Q:

A good control system has all the following features except

A) good stability B) slow response
C) good accuracy D) sufficient power handling capacity
 
Answer & Explanation Answer: B) slow response

Explanation: Repose is not included in a good control system.

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98
Q:

The following has tendency to oscillate.

A) Open loop system B) Closed loop system
C) Both (a) and (b) D) Neither (a) nor (b)
 
Answer & Explanation Answer: B) Closed loop system

Explanation: Both open loop system and closed loop system have the tendency to oscillate.

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146
Q:

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
 
Answer & Explanation Answer: D) the control action is independent of the output

Explanation: When the input to a system is independent of the output from the system, then the system is called an open-loop or unmonitored system.

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97
Q:

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
 
Answer & Explanation Answer: B) Presence of non-linearities causes malfunctioning

Explanation: When the input to a system is independent of the output from the system, then the system is called an open-loop or unmonitored system. It is also called as a calibrated system. Most measuring instruments are open-loop control systems, as for the same input signal, the readings will depend upon things like ambient temperature and pressure.

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109
Q:

Which of the following is an open loop control system ?

A) Field controlled D.C. motor B) Ward leonard control
C) Metadyne D) Stroboscope
 
Answer & Explanation Answer: A) Field controlled D.C. motor

Explanation: In field control D.C. motor, the input is dependent of the output. So it is an open loop control system.

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96