Machine Dynamics Mcqs

Q:

Which of the following should be done to make an unstable system stable ?

A) The gain of the system should be decreased B) The gain of the system should be increased
C) The number of poles to the loop transfer function should be increased D) The number of zeros to the loop transfer function should be increased
 
Answer & Explanation Answer: B) The gain of the system should be increased

Explanation: By increasing the gain of the system the unstable system can be stabalized.

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18
Q:

Which of the following devices are commonly used as error detectors in instruments ?

A) Vernistats B) Microsyns
C) Resolvers D) None of the mentioned
 
Answer & Explanation Answer: D) None of the mentioned

Explanation: The commonly used error detectors are self-balancing recording potentiometer, hot wire anemometer, eloctro-magnetic flow meter, torque sensor etc.

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17
Q:

_______________ is a closed loop system.

A) Auto-pilot for an aircraft B) Direct current generator
C) Car starter D) Electric switch
 
Answer & Explanation Answer: A) Auto-pilot for an aircraft

Explanation: Auto-pilot for an aircraft is a closed loop system as the input is totally dependent on the output whichever is required.

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22
Q:

By which of the following the control action is determined when a man walks along a path ?

A) Brain B) Hands
C) Legs D) Eyes
 
Answer & Explanation Answer: D) Eyes

Explanation: Walking id done through legs, so legs are only responsible.

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25
Q:

______________ is a part of the human temperature control system.

A) Digestive system B) Perspiration system
C) Ear D) Leg movement
 
Answer & Explanation Answer: B) Perspiration system

Explanation: Digestive system controls the digestion of food, ear is to get the sound and leg movement is controlled by brain. So, perspiration system only controls human body temperature.

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17
Q:

A closed loop system is distinguished from open loop system by which of the following ?

A) Servomechanism B) Feedback
C) Output pattern D) Input pattern
 
Answer & Explanation Answer: B) Feedback

Explanation: In open loop system we do not have any feedback but in closed loop system we have feedback.

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21
Q:

Any externally introduced signal affecting the controlled output is called a

A) feedback B) stimulus
C) signal D) gain control
 
Answer & Explanation Answer: B) stimulus

Explanation: The instrument measuring the output of the machine for comparison with the input to the machine is known as feedback. Any externally introduced signal affecting the controlled output is called a stimulus.

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23
Q:

An automatic toaster is a __________ loop control system.

A) open B) closed
C) partially closed D) none of the mentioned
 
Answer & Explanation Answer: A) open

Explanation: The output of a toaster is not dependent on the input of the toaster. Hence, it is a open loop control system.

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