Tata Elxsi

Tata Elxsi Placement Question Paper

TECH QUESTIONS (Electronics & TC)

1. CMRR is given=
Differential gain is given=
Inputs:
+ve end=2v,-ve end=1v of the OP-AMP
Find the output voltage?

2. CRO is in X-Y mode.Sinusoidal inputs have 90degrees phase difference between them. What will appear on the display? a)circle b)line c)ellipse d)triangular wave

3. Which has least propagation delay?
a)ECL b)TTL c)RTL d)CMOS

4. In a ripple counter how many change in states happen when count changes from7 to 8?
a)1 b)2 c)3 d)4

5. Max. no. of variables that can be represented in K-MAP?
a)3 b)5 c)7 d)none of these

6. How many comparators are required in a n-bit flash ADC?
a)2^(n-1) b)(2^n)-1 c)2^n d) n

7. What is an EEPROM?
a)Programmable transistor
b)Transistor
c)SRAM
d)

8. Time period of input voltage=8ns. / Find the duty cycle of Vout.

Image no.1

Voltage across one capacitor is V volts. Another cacitor is added at its one end(now the two are in series). What is the voltage across their ends?
a)V b)V/2 c)2v d)none of these

9. In an SCR why silicon is used?
a) available easily
b) has much less reverse saturation current than Germanium
c) has greater reverse sat.current than Ge
d)

10. Output=?

Image no.2

a)A’+B’+C
b)A+B+C’
c)A(B’+C’)
d)B’+C’+A’

11. There was a question using transmission gates.Three inputs were A,B,C.Answer was (A+BxorC)

12. How to get the characteristic figure changed from 1 to 3?(characteristic diagram)

Image no.3

a)By increasing gate width of NMOS
b)———do—————– of CMOS
c)By increasing gate voltage

14. Find propagation delay?

Image no.4

a)200Hz b)150Hz c)5Hz d)2Hz

15. A diagram was given to identify?
a)Synchronous counter
b)Ripple counter
c)Shift register
d)None of the above
answer was sync. Counter

16. Find Va?and Ia, Ib?

Image no.5

17. Find ammeter current Ia?

Image no.6

a)10V b)9.09V c)11.01V d)0.9V these options may be wrong.

Image no.7

18. This acts as a:
a)OR
b)XOR
c)AND
d)NOR

19. At t=0 if position is changed from 1 to 2 ,find the voltage across 1KΩ?

Image no.8

a)4V b)2V c)1.5V d)none of these

20. Find thevenin voltage and resistance across A and B

Image no.9

21. how will be the output voltage across R ?

Image no.10,11,12

22. What is this ?

Image no.13

a)Integrator b)Differentiator c)Antilog differentiator d)Log differentiator

23. Image no.14

Flip-flop state diagram question.What does the above represent?

24. What is this?

Image no.15

a)Squaring device b)Divider c)Square root ckt d)

25. How will be the output vs. input graph if Vin=10V,sat voltage of OP-amp is 14V?

Image no.16,17

26. Basic memory cell of dynamic RAM a. Capacitance
b. Flip flop
c. Transistor
d. Transistor with Capacitor

27. Ideal Power Supply has
a. Zero internal resistance
b. High O/P resistance
c. High I/P resistance Freshersworld.com
d. Low O/P resistance

28. Which type of transmission line will have max. value of characteristic impedence a. Open Wire line b. Coaxial Cable
c. Twin lead line d. None

29. For same peak value of current, which waveform will have least RMS value a. Sine b. Square
c. Triangular
d. Full wave rectified wave

30. -V analogy displacement is analogous to
a. Voltage b. Condutance
c. Magnetic Flux Linkage
d. Capacitance
Similarly…………..In F-I analogy displacement is analogous to
a. Charge
b. Resistance Freshersworld.com
c. Inductance
d. Current

31. In the following circuit Vo/Vin = (there were 4 options)

Image no.18

32. In the following circuit the charging and discharging time is (i don’t remember the options)

Image no.19

Don’t remember the other value of other res and cap .But some values are given

33. The output at X acts as….

Image no.20

a.OR gate
b.AND gate
c.XOR gate
d.XNOR gate

34. The CRO in X-Y mode gives the following figure. If signal applied to the Y-plate is 2sin(wt) then the signal applied to the X is a. 2 sin (wt) b. 2 sin (wt + p/4) c. 2 sin (wt d.2Ö2 sin (wt + p/4)

Image no.21