A (servo/DC motor changes the position or speed of a mechanical object discretel
ID: 1716610 • Letter: A
Question
A (servo/DC motor changes the position or speed of a mechanical object discretely, but a (servo/DC) motor changes motion continuously? A) DC; DC B) Servo; DC C) Sevo; Servo D) DC; Servo 15) What system transfers power from one point to another through mechanical motion that is used to do work, and has a unit to that determines efficiency and flexibility. A) electromechanical; Control B) sensing; Control C) electromechanical; sensing D) Control; timing 16) In a hexadecimal system, the larget digit is 15 (True/False)? 17) Sensors used to measure distance are based on measuring the time of flight by sending a light purse (True/False)? 18) Which of the following is NOT the property of Piezo electric sensors? A) detect light B) transducer C) detect voltage D) detect pressure 19) A robot that can be given new instructions to perform new tasks is considered artificial intelligent True/False)? 20) Rewrite the following text into a correct statement: "Hard automation is suited for producing a large number of items over along period of time, but after an item is no longer needed, the machinery used to manufacture it is often reprogrammed" 21) Pi Which of the following is a source of Infra Red radiation? A) warm objects B) flourescent lamp C) motor D) Battery 22) An opto-clcctronic device that converts light energy into electrical energy is a A) Both A and B B) photovoltaic device C) photoconductive device D) solar cell 23) Machines that can be reprogrammed to meet changing manufacturing needs are an example of ,and what is the clam originally used for what we now consider to be a robot? A) flexible automation; hard automation B) flexible automation; automaton C) hard automation; flexible automation D) artificial intelligence; anthropomorphic robotsExplanation / Answer
14)
B) Servo motor , DC motor.
A servomotor works on servomechanism, that is it works on closed loop feedback. A control signal and a feedback signal from the shaft of motor is fed to a decision making element which is usually an encoder. The decision making circuit produces signal to accurately control the position of motor. Hence servomotors control position in dicrete steps as decisons are made at regular insants. As compared to this DC motor has no feedback and it continues to rotate its shaft continiously as long as it gets required current.
15)
A) Electromechanical, Control.
Electromechanical system is a system that does the conversion of electrical to mechanical energy and vice versa.
Control unit is the unit, which is actually responsible for how a system behaves. If we change the configuration of control unit, it wil change the ways in which the system actually works. This causes flexiblity in the system. for e.g Control unit of a microprocessor may be wired in a particular way which causes longest instruction to execute say in 20 microseconds. If we rewire it in an alternative way, we can change the execution time.
16)
True.
Largest digit of hexadecimal system is F, which is decimal 15.
17)
True.
We can use ultrasonic waves as well. But these are suitabe for short distances whereas laser lights are used for long distances upto few meters.
18)
Detect light.
Piezoelectric sensors are reversible transducers which convert pressure to voltage and voltage to pressure.
19)
False. An artifical intelligent machine is one, which can make decsions, act and react like humans. This is possible if they have abundant information relating to world. Just by programming new instruction to do new tasks doesnt make a device intelligent. It should be able to act by itself.
20) Hard automation is suited to produce items in mass production. Once the item is no longer needed, it can be reprogrammed back.
21)
Warm objects. All substances whose temperature is above 0K emit infrared radaitions.
22) Options are wrong. Photovoltaic and solar cells are same and are responsible for light to electric energy conversion. Photoconductive cell is a passive device.
23)
B) Flexible automation, Automaton.
Flexible automation is one which the steps of automation can be reconfigured or reprogrammed just by varying the code that controls the automation.
Automaton is an ancient Greek term that was used for objects that can act on own will. Robots had this old name, as the goal was always to create an AI based robot.
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