TATA ELXSI Technical Questions - 24, April 2004

Posted on :20-02-2016
TATA ELXSI Placement Paper - 24, April 2004:-

Q1. How many comparators are required in an n-bit flash ADC?

a) 2^(n-1)
b) (2^n)-1
c) 2^n
d) n

Q2. In a ripple counter how many change in states happen when count changes from 7 to 8?

a) 1
b) 2
c) 3
d) 4

Q3. What is an EEPROM?

a) Programmable transistor
b) Transistor
c) SRAM
d) Chip

Q4. CRO is in X-Y mode. Sinusoidal inputs have 90 degrees phase difference between them. What will appear on the display?

a) circle
b) line
c) ellipse
d) triangular wave

Q5. Maximum number of variables that can be represented in K-MAP?

a) 3
b) 5
c) 7
d) none of these

Q6. Which has least propagation delay?

a) ECL
b) TTL
c) RTL
d) CMOS

Q7. In an SCR, why silicon is used?

a)  available easily
b)  has much less reverse saturation current than Germanium
c)  has greater reverse saturated current than Germanium.

Q8. CMRR is given; Differential gain is given;
Inputs for NOT Gate:
+ve end=2v,-ve end=1v of the OP-AMP.
Find the output voltage?

Q9. Find propagation delay? a) 200Hz
b) 150Hz
c) 5Hz
d) 2Hz

Q10. Find ammeter current Ia? a) 10V
b) 9.09V
c) 11.01V
d) 0.9V

Q11. Find Thevenin voltage and resistance across A and B Q12. What does the following diagram represent? Q13. The output at X acts as: a) OR gate
b) AND gate
c) XOR gate
d) XNOR gate

Q14. In the following circuit Vo/Vin = Q15. Time period of input voltage=8ns.  Find the duty cycle of V out. Voltage across one capacitor is V volts. Another capacitor 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

Q16. How to get the characteristic figure changed from 1 to 3? (characteristic diagram) a) By increasing gate width of NMOS
b) By increasing gate width of CMOS
c) By increasing gate voltage.

Q17. The following circuit acts as a: a) OR
b) XOR
c) AND
d) NOR

Q18. What is the following circuit? a) Integrator
b) Differentiator
c) Antilog differentiator
d) Log differentiator

Q19. How will be the output vs. input graph if Vin=10V, sat voltage of OP-amp is 14V? Q20. What is this? a) Squaring device
b) Divider
c) Square root circuit

Q21. At t=0 if position is changed from 1 to 2, find the voltage across 1K ohm? a) 4V
b) 2V
c) 1.5V
d) none of these

Q22. Find V a and I a, I b? Q23. Output=? a) A+B+C
b) A+B+C
c) A (B+C)
d) B+C+A

Q24. How will be the output voltage across R?  ANS: c

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