Paella Vasca

How many layers of semiconductor material does an NPN transistor have?. 1. 2. 3.

What is the function of a transistor in an electronic circuit?. power supply. current regulator. converts electric current into magnetic field.

how many inputs and outputs does an operational amplifier have?. one input and two outputs. two inputs and two outputs. two inputs and one output.

What give the colour of a LED?. the plastic it is encased it. the active element. the plastic it is encased it.

the conducting voltage of a LED diode is: is 0,7V, same as in a normal diode. it is not 0,7V, it is of greater valiue than in a normal diode. is negative.

In an NPN transistor the P is: collector. base. emitter.

What is an integrated circuit?. A group of diodes, transistors and/or other combined elements. A set of low and high power transistors. A set of diodes, ralays and a combination of both.

A printed circuuit board (PCB) is constructed of a plastic laminate which has bonded to one or both sides. various thicknesses of copper. a thin sheet of copper. a thick sheet of copper.

PNPN is a: schoffley diode. schottky diode. Schockley diode.

what is the base material of a PCB. conductor. semiconductor. insulator.

A differential synchro has. single phase stator,2 phase rotor. 3 phase stator,single phase rotor. 3 phase stator,3 phase rotor.

In a control synchro the stator current ceases to flow when the: power is removed. tewo rotors are aligned. CT rotor is at null.

what control system is used on an input that gives a controlled predetermined output?. control servo. open loop. closed loop.

photopdiode is operated under. forward bias condition. reverse bias condition. reverse and forward bias condition.

A logic circuit with more than one gate will have. An analogue output. 2 or more outputs. One of 2 states of logic output.

The gate electrode of a FET equates to: the emitter of a NPN transistor. the base of a NPN or PNP transistor. the collector of a PNP transistor.

tunnel diodes have the following characteristics. lightly doped P region, heavily doped P-N junction with an extremely narrow depletion region. Heavily doped P-N junction with an extremely narrow depletion region. lightly doped P and N regions and a high reverse breakdown.

A TRIAC is a type of : thyristor. thermistor. transistor.

P type material require. conductors. donors. acceptors.

which of the following explains how the photodiode works?. photodiodes are back biased to conduct when light falls upon them. photodiodes are forward biased to conduct when light falls upon them. photodiodes are back biased not to conduct when light falls upon them.

if light entering a photo transistor decreases, the current to the collector. increases. remains the same. decreases.

A silicon bi-polar transistor with two depletion zones. consists of 3 slices of semiconductor material. operates by varying electric fields. is a voltage operated device.

What class of amplifier is biased at cut off?. A. C. B.

a common collector circuit has the following characteristics: low voltage gain, high current gain, non-inverted output. medium volatge gain, high current gain, non-inverted output. medium voltage Gain, low current gain, inverted output.

In an ideal voltage amplifier. input impedance must be low and output impedance high. input impedance must be high and output impedance low. input impedance must be high and output impedance high.

how are the pins numbered on an OP-AMP IC?. From left to right from the dot. clockwise from the dot. counter clockwise from the dot.

A VLS IC has: more than 1000 gates. more than 10000 gates. less than 100 gates.

the application of a stick off voltage to a controlm synchro servo system is. to prevent alignment to a false null. to overcome the effect of static friction. to overcome the effectof viscous friction.

In a control synchro the stator current ceases to flow when. when the two rotors are aligned. the CT rotor is at null. when power is removed.

a two phase induction motor used in a servomechanism. is self startingunder light loads. will always require a starter. runs with no slip.

the output of a tachogenerator should be. linear. sinusoidal. exponential.

torque synchro receiver bearing friction will cause. hunting. improved accuracy. misalignment.

the letter B following the identification code on the case of a synchro denotes. that the stator is rotatable. the modification status. that the synchro is second hand.

What is the meaning of ESD?. electro-static disease. electronic static device. electro-static discharge.

how susceptible are CMOS to damage from ESD?. Between 250 volts and 3000 volts. between 380V to 7000 V. low as 100 V.

which statement about the correcting variable X is correct?. it is the output signal from the controlling system and the input signal to measuring transducer. it is the output signal from the measuring transducer and the input signal to correcting elements¡. it is the output signal from the controlled system and the input signal to measuring transducer.