iGate Patni, Hexaware, Tech mahindra Technical interview questions of ET&T, Elec, EEE

        Hexaware, IGate patni, TCS, Tech mahindra, Technical Interview Questions
 
1. Which of following dissipates least power?

a.TTL

b.ECL

c.RTL

d.CMOS [ans]



2. What is the laplace transform of unit impulse function?

Ans.1/s.



3. The resistor is given voltage V=150 sint .what is the power dissipated?



4. How to find the value of Z in theveins theorm ?

Ans sc voltage source and oc current source.



5. If in addition of excess-3 code the sum exceeds 9 then what we hav to do?

Ans subtract it by 0011



6. A signal is modulated having modulation index 3 and 4 .what will be resultant M.I

Ans 5[srt of m1+m2]



7. IC timer 555 can be used as?

a. astable mv

b. monostable mv

c .freq divider

d. all[ans]



8. Give the contents of SP & HL pair after the execution of following statements

1002 LXI SP, 27FFH

1003 CALL 1006H

1006 PUSH H

Ans SP=27FFH HL=1006H

9. Phase margin of system is 125 what is its gain margin?

Ans -125 [not sure]



10. If the gate voltage is increased the n what will be the effect In MOSFET?

Ans Channel widens.



11. Current in the rotor of 3 phase induction motor is due to?

Ans Induction.



12. Question on transmission line with values of Zoc and Zsc given.Find the value of Zch?

Ans Zch =sqrt[ZocXZsc].



13. White noise has?

Ans Flat power spectral density.



14. The Transfer function of the system was given .find the no. of breakaway pts?



15. If a function has half wave symmetry its Fourier transform consist of?

A. only odd harmonics

B. only even harmonics

C. Both even & odd harmonics but no constant term



Some questions were from digital communication, digital electronics all questions were basic.

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