This is the Section 5 Module 6 of the compiled Electronics Coaching Materials taken from different sources including but not limited to Electronics books, past Board Exams Questions, Journals and other Electronics References. This particular Coaching Notes in Electronics Engineering has random Questions and Answers in random topics. Make sure to familiarize each questions to increase the chance of passing the ECE Board Exam.
Electronics Engineering Coaching: Section 5 Module 6
· Discharge of electricity from a conductor with a high potential
· Power transformer normally operates at ______ alternating current.
Ans: 60 or 400 Hz
· What probable effect on the human body if subjected to a current of 0 to 1 mA, 60 Hz, AC or 0 to 4 mA DC?
· What probable effect on the human body if subjected to a current of 1 to 4mA, 60 Hz, AC or 4 to 15 mA DC?
· What probable effect on the human body if subjected to a current of 4 to 21 mA, 60 Hz, AC or 15 to 80 mA DC?
Ans: Reflex action
· What probable effect on the human body if subjected to a current of 21 to 40 mA, 60 Hz, AC or 80 to 160 mA DC?
Ans: Muscular Inhibition
· What probable effect on the human body if subjected to a current of 40 to 100 mA, 60 Hz, AC or 160 to 300 mA DC?
Ans: Respiratory failure
· What probable effect on the human body if subjected to a current of over 100 mA, 60 Hz, AC or 300 mA DC?
· What is the effect of hydrogen surrounding the anode of a cell which increases the internal resistance of the cell?
· What is the anode of a lead –acid cell?
Ans: Lead peroxide
· What is the cathode of a lead acid cell?
Ans: Sponge lead
· What is the anode of a NiCad Cell ?
· What is the anode of a silver zinc cell?
Ans: Silver oxide
· What is the cathode of a silver zinc cell ?
· What is the production of the hydrogen gas caused by a portion of the charge current breaking down the water in the electrolyte?
· What is the shelf life of lithium organic cell and lithium inorganic cell?
Ans: 20 years
· In what charge is the charging rate determined by the battery voltage rather than a definite current value?
Ans: Floating charge
· What charge is used to keep a battery at full charge while the battery is idle or light duty?
Ans: Floating charge
· Floating charge is sometimes referred to as ___ and is accomplished with low current.
Ans: Trickle charge
· What is used when a battery must be recharged in the shortest possible time?
Ans: Fast charge
· Electrical safety precatutions must be observed. A fatal shock can occur from ___ ampere of current.
· Voltages as low as ___ volts have been recorded as causing sufficient current to be fatal.
· What type of extinguishers are used to extinguish electrical fires?
· Under favorable conditions, the body resistance may be as low as ___ ohms
· The body resistance is possibly as low as ___ from temple to temple if the skin is broken.
· In a voltage divider, bleeder current is usually determined by the ___ percent rule of thumb.
· A theory of magnetism based upon the electron-spin principle.
Ans: Domain Theory.
· What action results in the increase in current that generates more heat and the cycle repeats itself until the diode draws excessive current?
Ans: Thermal runaway
· What is the faithful reproduction of a signal in an amplifier?
· What dc generators are designed to act as high gain amplifier?
· What is the range of the dc resistance of most motor armatures?
Ans: 0.05 to 0.5 ohms
· What is usually the lamination thickness of the armature core of a small generator?
Ans: 1/64 inches
· Mechanical rotation of frequency is measured using a device called___.
· The rotation of frequency of recording devices and teletypewriter motors can be measured by the use of _____.
· What is an instrument that allows you to view rotating or reciprocating objects intermittently and produces the optical effect of a slowing down or stopping motion?
· What is an electronic flash device in which the flash duration is very short, a few millionths of a second and can measure very rapid motion?
· What is a combination of watch and revolution counter?
Ans: Chronometric tachometer
· What type of bolometer is characterized as an increase in resistance as the dissipated power rises?
· What type of bolometer is characterized by decrease in resistance as the power increases?
· What instrument is used for measuring radio frequency (rf) power?
Ans: Thermocouple ammeter
· Which of the following robots is used for machining processes?
Ans: Cincinatti T3
· Kuka spot welding has ___ degrees of freedom.
Ans: All positions
Ans: flat and horizontal positions
· Magnetic audio tape
· Magnetic video tape
· Thickness of magnetic audio tape
Ans: 1 mil
· A sawtooth wave has a ____ added to become trapezoidal wave.
· Absent of current welding
Ans: cool sub-interval
· 1.5 H
Ans: Air pot core
· Who coined the term robotics?
Ans: Isaac Asimov
· Oldest welding
Ans: Forge welding
Ans: High achievable power output
· Inert gas
· Active gas
· Antrophomorphic robot is
Ans: more maneuverable
· It is also known as metal inert gas.
Ans: Gas Metal Arc Welding (GMAW)
· Robot with facial expression
· Toy dinosaur robot
· Snap acting switch
· Approach in which introduce factory automation technology
Ans: Islands of automation
· Degree of automatic.
Ans: Level of automation
· Orange, blue and gray diode
· It is the welding electrode comes forward and engage the metal pressing against the surface.
Ans: squeeze interval
· It is the welding in which the welding transformer energized and the current flows and create a weld.
Ans: weld interval
· It is the weld interval that is finished
Ans: hold interval
· Welding electrode is retracted
Ans: release interval
· A time after release interval to the next start sequence.
Ans: Standby interval.
· It is a closed loop feedback control system in which one or more of the system signals represent mechanical motion.
· E60xx has a tensile strength of ___
Ans: 60,000 psi
· With AC or DC similar to E6010
· Major power supply of MIG
· Medium penetration
· Can be prevented by arc welding
Ans: Arc flow
· Faying surfaces in one spot
Ans: Resistance spot welding
· Faying surfaces
Ans: Resistance seam welding
· Resistance of the work
Ans: Resistance welding
· Mass of 60-lb IR robot
Ans: 60 kg
· Deep penetration
Ans: Submerged arc
· Deep penetration
Ans: DC reverse
· Medium penetration
Ans: DC straight
· Fast welding
Ans: Flash welding
· 10,000 to 50,000 Hz welding
Ans: High frequency welding
· Image resolution
Ans: Dot pitch
· Voltage of dry electrolytic capacitor
Ans: 500 V
· Apply electrostatic voltage in plastic
Ans: Electroactive polymer
· In electrolytic positive, ___ of the total heat.
· Prevents corona
· 450°F below…
· above 450°F joining of two metals
· Metla active gas
· Multimeter on the lower center switch
Ans: Range switch
· Multimeter on the lower left switch
Ans: Function switch
· Aluminum D-ARsonval movement
· Positive lead
· Negative lead
· Angular momentum of robot
· GaAs disadvantage
Ans: more expensive
· Disadvantage of Transformer to capacitive coupling
Ans: more expensive
· A motor or transducer that converts energy (electrical, hydraulic, or pneumatic) into power used to produce motion or power.
· The ability of a robot to position its end effector at a programmed location in space.
· Control signals that are processed by directly measuring quantities (voltages, resistances or rotation). This can be hydraulic, electronic or pneumatic.
Ans: analog control
· A robot or machine that resembles a human.
· A robot with rotary joints that can move much like a person’s arm.
Ans: anthrophomorphic robot
· An interconnected set of links and powered joints comprising a manipulator that supports or moves a wrist, hand or end effector.
· The ability of a machine system to perceived anticipated or unanticipated new conditions, decide what actions must be performed under the conditions and plan the actions accordingly. The main areas of applications are expert systems and computer vision.
Ans: artificial intelligence
· Also known as assembly cell or assembly station. A concentrated group of equipment such as manipulators, vision modules, parts presenters, and support tables that are dedicated to compute assembly operations at one physical location.
· The use of any one several techniques to determine the presence or absence of features. This technique include simple mechanical probes and vision systems.
Ans: automated inspection
· Automatically controlled operation of an apparatus, process or system by mechanical or electronic devices that replace human observation, effort and decision.
· A traveled path in space, usually referred to as a linear direction of travel in any of three dimensions.
· A robot in which motions are controlled by driving each axis or degree of freedom against a mechanical limit stop.
Ans: bang-bang robot
· A platform or structure to which a robot arm is attached; the end of a kinematic chain of arm links and joints opposite to which grasps or processes external objects.
· A manufacturing unit consisting of two or more workstations or machines and the material transport mechanisms and storage buffers that interconnect them.
· A manufacturing unit consisting of two or more cells, and the material transport mechanisms and storage buffers that interconnect them.
· An assembly between two closely related rigid members enabling on member to rotate in relation to the other around a mobile axis.
Ans: complex joint
· The use of an interactive terminal workstation usually with graphics capability to automate the design of products. It includes functions such as drafting and fit-up parts.
Ans: computer aided design (CAD)
· Working from a product design likely to exist in a CAD data base, it encompases the computer based technologies that physically produce the product, including parts program preparation, process planning, tool design, process analysis and parts processing by numerically controlled machines.
Ans: computer-aided manufacturing (CAM)
· A numerical control system with a dictated mini or micro computer that performs the functions of data processing and control.
Ans: computerized numerical control (CNC)
· The unit of automatic work for a robot. Within a cycle, subelements called trajectories define lesser but integral elements. Each trajectory is made up of points where the robot performs an operation or passes through depending upon the programming.
Ans: cycle (program)
· The number of independent ways the end effector can move. It is defined by the number of rotational or translational axes through which motion can be obtained.
Ans: degrees of freedom
· The joint that connects the upper arm and forearm on a robot.
· Also known as end of arm tooling or simply a hand. The subsystem that links the mechanical portion of the robot (manipulator) to the part being handled or work on, and gives the robot the ability to pick yp and transfer parts and/or handle a multitude of different tools to perform work on parts.
Ans: end effector
· Robots with little if any computer power. Their only intelligent functions consist of learning a sequence of manipulative actions, choreographed by a human operator using a teach box.
Ans: first generation robot system
· Also known as nonservo robot or open robot. A robot with stoppoint control but no trajectory control.
Ans: fixed stop robot
· Multipurpose robots that are adaptable and capable of being redirected trained or used for new purposes.
Ans: flexibility operational
· An arrangement of machine tools that is capable of standing alone, interconnected by a workpiece transport system and controlled by a central computer.
Ans: flexible manufacturing system (FMS)
· Also known as pedestal robot. A robot with its base permanently or semi-permanently attached to the floor or bench. Such a robot is working at one location with a maximum limited work area and in many cases servicing only one machine.
Ans: floor mounted robot
· That portion of a jointed arm which is connected to the wrist and elbow
· An overhead mounted, rectilinear robot with a minimum of three degrees of freedom and normally not exceeding six.
Ans: gantry robot.
· The grasping hand of a robot, which manipulates objects and tools to fulfill a given task.
· An approach used to introduce factory automation technology into manufacturing by selective application of automation.
Ans: islands of automation.
· The degree to which a process has been made automatic. Relevant to the level of automation are questions of automatic failure recovery, the variety of situations that will be automatically handled, and the conditions under which manual intervention or action by human beings is required.
Ans: level of automation
· An electrical switched positioned to be switched where a motion limit occurs, thereby deactivating the actuator that causes the motion.
Ans: limit switch
· A mechanism usually consisting of a series of segments or links, jointed or sliding to one another, for grasping or moving objects, usually in several degrees of freedom.
· A method for the control of machine tool systems. A program containing all the information, in symbolic numerical form, needed for processing a workpiece is stored on a medium such as paper or magnetic tape.
Ans: numerical control
· Developing robot programs partially or completely without requiring the use of the robot itself. The program is loaded into the robot’s controller for subsequent automatic action of the manipulator.
Ans: off-line programming
· Software that controls the execution of computer programs, may provide scheduling, allocation, debugging data management, and other functions.
Ans: operating systems
· Also known as positioning. The consistent movement or manipulation of an object into controlled position and altitude in space.
· The equipment used in conjunction with the robot for a complete robotic system. This includes grippers, conveyors, parts positioners and parts or materials feeders that are needed with the robot.
Ans: peripheral equipment
· Also known as bend. The angular rotation of a moving body about an axis that is perpendicular to its direction of motion and in the same plane as its top side.
· Also known as photoelement or photosite. A digital picture or sensor element, picture is short for picture cell.
· The act of providing the control instructions required for a robot to perform its intended task.
· The envelope of variance of the robot tool print position for repeated cycles under the same conditions. It is obtained from the deviation between the positions and orientations reached at the end of several similar cycles. Contrast with accuracy.
· A reprogrammable, multifunctional manipulator designed to move a material, parts, tools, or specialized devices through variable programmed motions for the performance of a variety of tasks.
· The science of designing, building and applying robots.
· Also known as twist. The rotational displacement of a joint around the principal axis of its motionj, particularly at the wrist.
· A robot with a computer processes added to the robotic controller. This addition makes it possible to perform, in real time, the calculations required to control the motions of each degree of freedom in a cooperative manner to effect smooth motions of the end effector along predetermined paths. It also become possible to integrate simple sensors, such as force torque, and proximity into the robot system ,providing some degree of adaptability to the robot’s environment.
Ans: second generation robot system
· A controller that operates an application though a fixed sequence of events.
· A robot driven by servomechanisms, that is, motors or actuators whose driving signal is a function of the difference between a commanded position and/or rate is measured actual position and/or rate.
Ans: servocontrolled robot
· An automatic control mechanism consisting of a motor or actuator driven by a signal that is a function of the difference between a commanded position and/or rate and measured actual position and/or rate.
· The manipulator arm linkage joint that is attached to the base.
· The maximum velocity at which a manipulator joint can move; a rate imposed by saturation in the servoloop controlling the joint.
Ans: slew rate
· The use of two or more cameras to pinpoint the location of an object in a three dimensional space.
Ans: stereo imaging
· The detection by a robot though contact of touch, force, pattern slip and movement. It allows for the determination of local shape, orientation and feedback forces of a grasped workspace.
Ans: tactile sensing