Monday, 11 September 2017

BASIC ELECTRONIC INTERVIEW QUESTIONS 2

By Ask Biomedical
*Interview questions and answers*


1)semiconductor materials have________________temperature cofficient
Ans . negative

2)The Hall effect voltage in intrinsic silicon
Ans. is negative

3)The effect of doping intrinsic semiconductor is to
Ans. move the Fermi level away from the centre of the forbidden band

4)The function of the safety resistor in ohm meter is to
Ans. limit the current in the coil

5)Which transducer converts heat energy into electrical energy
Ans. thermocouple

6)In CRT the focusing anode is located
between pre accelerating and accelerating anodes


7)Aquadag is used in CRO to collect
*Ans*
Both primary and secondary electrons

8)A device that changes one form of energy to another is called.
*Ans*
transducer

9)The electric device which blocks DC but allows AC is called:
*Ans*
capacitance

10)Which of the following electrical equipment cannot convert ac into dc
*Ans*
rectifier

11)turn on and turn off times of transistor depends on
*Ans*
junction capacitances

12)the surface dark current of a photodetector depends on
*Ans*
surface defects.

13)a solar cell is a device which uses
*Ans*
photo voltaic effect.

14)GaAs led’s emit radiation in the
*Ans*
infrared region

15)the wavelength of emitted light in led depends on
*Ans*
energy gap of the material

16)the input Gate current of FET is of the order of
*Ans*
Negligible

18)the drain source voltage at which drain current becomes constant is called
*Ans*
pinch off voltage

19)FET’S are basically
*Ans* voltage controlled devices.


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