Mancomunidad 4

What type of analogue transducer is a tacho-generator?. A tacho-generator is a position transducer. A tacho-generator is a speed transducer. A tacho-generator is a force transducer.

According to Neils Bohr's mathematical formulations, how many electrons can the third orbit hold?. The third orbit of an atom holds 2 electrons. The third orbit of an atom holds 8 electrons. The third orbit of an atom holds 18 electrons.

Why are PCBs widely used in electronics manufacture?. PCBs widely used in electronics manufacture because they are rugged, inexpensive and can be highly reliable. PCBs widely used in electronics manufacture because they are less expensive in low-volume production and do not require drilling. PCBs widely used in electronics manufacture because they work much quicker, allow higher bandwidth and use less metal.

What types of printed circuit boards do we know?. Single-layer, multi-layer and double-sided. Single-layer, multi-layer and multi-layer sandwich. Single-layer, multi-layer and plated through-hole.

Which is the last stage of operational amplifier?. Output stage. Input stage. Second stage.

What are the major components of a basic Desynn system?. A basic Desynn system consists of a transmitter only. A basic Desynn system consists of an indicator only. A basic Desynn system consists of a transmitter and an indicator.

Which stage of operational amplifier is a high-gain amplifier?. Second stage. Input stage. Output stage.

What voltage is required to "switch on" the transistor?. The base-emitter voltage is approximately 0.2 V. The base-emitter voltage is approximately 0.6 V. The base-emitter voltage is approximately 0.9 V.

Which element of a transistor has the largest size?. The Collector of a transistor has the largest size. The Base of a transistor has the largest size. The Emitter of a transistor has the largest size.

What kind of device is PNP or NPN transistor?. A PNP or NPN transistor is a current operated device. A PNP or NPN transistor is a voltage operated device. A PNP or NPN transistor is both current and voltage operated device.

What does the arrow in the symbol of a transistor indicates?. The arrow in the symbol of a transistor indicates the direction of electron flow in the emitter. The arrow in the symbol of a transistor indicates the direction of electron flow in the collector. The arrow in the symbol of a transistor indicates the direction of hole flow in the emitter.

Which pin is always identified on an 8 pin DIP or DIL integrated circuit?. Pin 1 is always identified on an 8 pin DIP or DIL integrated circuit. Pin 8 is always identified on an 8 pin DIP or DIL integrated circuit. Pin + is always identified on an 8 pin DIP or DIL integrated circuit.

Which side of the junction is the anode connection of a diode?. The anode connection of a diode is the depletion layer. The anode connection of a diode is the N-type terminal. The anode connection of a diode is the P-type terminal.

How does the resistance of the photodiode change when a PN junction of a photodiode is exposed to a light source? (1-46). The resistance of the photodiode increases, when a PN junction of a photodiode is exposed to a light source. The resistance of the photodiode decreases, when a PN junction of a photodiode is exposed to a light source. The resistance of the photodiode does not change, when a PN junction of a photodiode is exposed to a light source.

How can you tell if LED diode is failing?. LEDs mostly fail by dimming over time. LEDs failure is indicated by abrupt burn-out of incandescent bulbs. LEDs can not fail.

Which semiconductor material (silicon or germanium) has the most stable temperature characteristic?. Silicon has a more stable temperature characteristic than germanium. Germanium has a more stable temperature characteristic than silicon. Silicon and germanium have generally equal temperature stabilities.

Which material is electrically neutral in a diode junction?. Only the N-type material is electrically neutral. Only the P-type material is electrically neutral. Both N-type material and P-type material are electrically neutral.

Which diode can be used for device "power on" indication ??. Led Diode. Schottky Barrier Diode. diode.

How do you make a diode conduct?. To make a diode conduct, the anode must be positive with respect to the cathode. To make a diode conduct, the anode must be negative with respect to the cathode. To make a diode conduct, the anode and cathode must be connected together.

What is the approximate forward threshold voltage for a silicon diode?. Forward threshold voltage for a silicon diode = 0.1 V. Forward threshold voltage for a silicon diode = 0.3 V. Forward threshold voltage for a silicon diode = 0.6 V.

When is the solid state device turned on in an NPN transistor application?. The base is negative with respect to the emitter. The collector is negative with respect to the base. The base is positive with respect to the emitter.

What does the arrow in the symbol of a transistor indicates?. The direction of electron flow in the emitter. The direction of electron flow in the collector. The direction of hole flow in the emitter.

What is the principle of Thyristor operation?. It can be only close to prevent current flow through the device. It can be only open to allow current flow through the device. It can be open or shut, allowing or preventing current flow through the device.

Which element of a transistor has the largest size?. The Collector of a transistor has the largest size. The Base of a transistor has the largest size. The Emitter of a transistor has the largest size.

What is the realistic input impedance of an operational amplifier?. Very high. Very low. Zero.

Which is the last stage of operational amplifier?. Output stage. Input stage. Second stage. Previous.

What does the arrow indicate on a transistor symbol?. The emitter, for both PNP and NPN types. The collector, for both PNP and NPN types. The emitter for PNP type, and the collector for NPN type. The emitter for NPN type, and the base for PNP.

What is the advantage of Surface-Mount Technology over through-hole technology?. Surface-Mount Technology uses smaller components with metal tabs or end caps that can be soldered to the surface of a…. Surface-Mount Technology uses special metal mounts that allow easier component placement on a PCB. Surface-Mount Technology uses special dielectric surface which allows more components to be placed on a single board.

Which synchros are used when large amounts of power and a higher degree of accuracy are required?. Optic synchros. Torque synchros. Control synchros.

What is the realistic gain of an operational amplifier?. Zero. Very high. Negative.

What type of system is a servo altimeter?. A servo altimeter is a closed loop system. A servo altimeter is an open loop system. A servo altimeter is a passive control loop system.

What is the purpose of doping?. To decrease the number of free charges that can be moved by an externally applied voltage. To increase the number of free charges that can be moved by an externally applied voltage. To decrease the number of free charges that can be moved without an externally applied voltage.

Which thermistor has a positive temperature coefficient?. NTC. PTC. STC.

What colours can a light-emitting diode produce, when forward biased?. White, red or green are the possible colours produced by a light-emitting diode. White, red or yellow are the possible colours produced by a light-emitting diode. Amber, red or green are the possible colours produced by a light-emitting diode.

How many PN junctions does a transistor have?. A transistor has a 1 PN junction. A transistor has 2 PN junctions. A transistor has 3 PN junctions.

Which way does conventional current flow in a PNP transistor?. Conventional current flows from collector to emitter in a PNP transistor. Conventional current flows from collector to base in a PNP transistor. Conventional current flows from emitter to base in a PNP transistor.

What are operational amplifiers that are used with feedback called?. Operational amplifiers with feedback are 'Open-loop op-amp'. Operational amplifiers with feedback are 'Closed-loop op-amp. Operational amplifiers with feedback are 'Inverting op-amp'.

What logic do two switches wired in series represent?. Two switches wired in series represents an AND gate. Two switches wired in series represents an OR gate. Two switches wired in series represents a NAND gate.

What property does the 'substrate' of a printed circuit board has?. The 'substrate' of a printed circuit board is conductive. The 'substrate' of a printed circuit board is non-conductive. The 'substrate' of a printed circuit board is semi-conductive.

Why is there a cost advantage of a printed circuit board compared to point-to-point wiring?. The cost advantage of a printed circuit board compared to point-to-point wiring, is due to the efficiency of design, layout and set up. The cost advantage of a printed circuit board compared to point-to-point wiring, is due to easier mass production of manufacture. The cost advantage of a printed circuit board compared to point-to-point wiring, is due to the greater operational efficiency.

How is an open-loop servomechanism system defined?. An open-loop servomechanism has no feedback loop. An open-loop servomechanism has no load. An open-loop servomechanism has no amplifier.