HomeElectronics Multiple choice question MCQ online testVLSI online test mcq (part1) VLSI online test mcq (part1) Leave a Comment / Electronics Multiple choice question MCQ online test Spread the love 0% Created on July 23, 2023VLSI VLSI (part1) 1 / 50 1. The BiCMOS are preferred over CMOS due to . . . . . . . . a. Sensitivity is less with respect to the load capacitance b. Switching speed is more compared to CMOS c. All of the mentioned d. High current drive capability 2 / 50 2. In nMOS inverter configuration depletion mode device is called as . . . . . . . a. Pull down b. None of the mentioned c. All of the mentioned d. Pull up 3 / 50 3. What are the advantages of BiCMOS? a. Higher gain b. All of the mentioned c. High frequency characteristics d. Better noise characteristics 4 / 50 4. Substrate bias voltage is positive for nMOS. a. False b. True 5 / 50 5. If both the transistors are in saturation, then they act as . . . . . . . . a. Divider b. Voltage source c. Buffer d. Current source 6 / 50 6. In CMOS inverter, transistor is a switch having . . . . . . . . a. Finite off resistance b. Buffer c. Infinite on resistance d. Infinite off resistance 7 / 50 7. Speed power product is measured as the product of . . . . . . . . a. Gate power dissipation and absorption b. Gate switching delay and gate power dissipation c. Gate switching delay and gate power absorption d. Gate switching delay and net gate power 8 / 50 8. In CMOS fabrication, the photoresist layer is exposed to . . . . . . . . a. Visible light b. Ultraviolet light c. Fluorescent d. Infra red light 9 / 50 9. Which has better I/A? a. Bipolar b. nMOS c. CMOS d. pMOS 10 / 50 10. The . . . . . . . . is used to reduce the resistivity of poly silicon. a. Photo resist b. Doping impurities c. None of the mentioned d. Etching 11 / 50 11. The transistors used in BiCMOS are . . . . . . . . a. JFET b. MOSFET c. BJT d. Both BJT and MOSFETs 12 / 50 12. Substrate doping level should be decreased to avoid the latch-up effect. a. False b. True 13 / 50 13. Heavily doped polysilicon is deposited using . . . . . . a. Chemical deposition b. Chemical vapour decomposition c. Chemical vapour deposition d. Dry deposition 14 / 50 14. Surface mobility depends on . . . . . . . . a. Effective source voltage b. Channel length c. Effective gate voltage d. Effective drain voltage 15 / 50 15. BiCMOS inverter requires high load current sourcing a. True b. False 16 / 50 16. Ids depends on . . . . . . . a. Vss b. Vg c. Vdd d. Vds 17 / 50 17. What is the disadvantage of the MOS device? a. Limited voltage sourcing b. Limited voltage sinking c. Limited current sourcing d. Unlimited current sinking 18 / 50 18. Pass transistors are transistors used as . . . . . . . a. Inverters used in series b. Switches connected in parallel c. Switches connected in series d. Inverter used in parallel 19 / 50 19. Increasing fan-out . . . . . . . . the propagation delay. a. Exponentially decreases b. Decreases c. Does not affect d. Increases 20 / 50 20. The MOSFETS are arranged in this configuration to provide . . . . . . . . a. Zero static power dissipation b. High Input impedance c. None of the mentioned d. Both zero static power dissipation and high input impedance 21 / 50 21. For depletion mode transistor, gate should be connected to . . . . . . . . a. Drain b. Ground c. Positive voltage rail d. Source 22 / 50 22. What is the condition for non conducting mode? a. Vgs = Vds = Vs = 0 b. Vgs = Vds = 0 c. Vds lesser than Vgs d. Vgs lesser than Vds 23 / 50 23. CMOS technology is used in developing which of the following? a. Digital logic circuits b. Microcontrollers c. All of the mentioned d. Microprocessors 24 / 50 24. If the gate is given sufficiently large charge, electrons will be attracted to . . . . . . a. Drain region b. Switch region c. Channel region d. Bulk region 25 / 50 25. Fast gate can be built by keeping . . . . . . . . a. High on resistance b. High output capacitance c. Low output capacitance d. Input capacitance does not affect speed of the gate 26 / 50 26. In BiCMOS, MOS switches are used to . . . . . . a. Drive input loads b. Drive output loads c. To perform logic functions d. To amplify the input voltage 27 / 50 27. As die size shrinks, the complexity of making the photomasks . . . . . . . a. Decreases b. Cannot be determined c. Remains the same d. Increases 28 / 50 28. The current Ids . . . . . . . . as Vds increases. a. Decreases b. Exponentially increases c. Increases d. Remains fairly constant 29 / 50 29. The n-well collector is formed by . . . . . . . a. Lightly doped n-type diffused layer on p-Substrate b. Heavily doped n-type epitaxial layer on p-Substrate c. Lightly doped n-type epitaxial layer on p-Substrate d. Heavily doped n-type diffused layer on p-Substrate 30 / 50 30. Interconnection pattern is made on . . . . . . a. Diffusion layer b. Silicon-di-oxide layer c. Polysilicon layer d. Metal layer 31 / 50 31. If p-transistor is conducting and has small voltage between source and drain, then it is said to work in . .. . . a. Non saturation resistive region b. Saturation region c. Cut-off region d. Linear region 32 / 50 32. Transconductance gives the relationship between . . . . . . . a. Input current and output voltage b. Input current and input voltage c. Output current and input voltage d. Output current and output voltage 33 / 50 33. Latch-up is the generation of . . . . . . . a. Low impedance path b. High resistance path c. High impedance path d. Low resistance path 34 / 50 34. Increasing the transconductance . . . . . . a. Decreasing input capacitance b. Increases input capacitance c. Decrease in output capacitance d. Decreasing area occupied 35 / 50 35. The isolated active areas are created by technique known as . . . . . . a. Etched field-oxide isolation or Local Oxidation of Silicon b. Local Oxidation of Silicon c. Etched field-oxide isolation d. None of the mentioned 36 / 50 36. In latch-up condition, parasitic component gives rise to . . . . . . . . conducting path. a. High capacitance b. Low capacitance c. Low resistance d. High resistance 37 / 50 37. MOS transistor structure is . . . . . . a. Pseudo symmetrical b. Non symmetrical c. Symmetrical d. Semi symmetrical 38 / 50 38. Switching speed of a MOS device depends on . . . . . . a. Gate voltage above a threshold b. Length channel c. All of the mentioned d. Carrier mobility 39 / 50 39. Which of the following is true when inputs are controlled by equal amounts of charge? a. Cg(MOS) lesser than Cbase(bipolar) b. Cs(MOS) lesser than Cbase(bipolar) c. Cg(MOS) greater than Cbase(bipolar) d. Cg(MOS) = Cbase(bipolar) 40 / 50 40. N-well is formed by . . . . . . . . a. Dispersion b. Filtering c. Diffusion d. Decomposition 41 / 50 41. Positive photo resists are used more than negative photo resists because . . . . . . . . a. Positive photo resists are less sensitive to light b. Negative photo resists are more sensitive to light, but their photo lithographic resolution is not as high as that of the positive photo resists c. Negative photo resists are less sensitive to light d. Positive photo resists are more sensitive to light, but their photo lithographic resolution is not as high as that of the negative photo resists 42 / 50 42. Which process produces a circuit which is less prone to latch-up effect? a. nMOS b. BiCMOS c. pMOS d. CMOS 43 / 50 43. Increasing Vsb . . . . . . . . the threshold voltage. a. Increases b. Decreases c. Exponentially increases d. Does not effect 44 / 50 44. Depletion mode MOSFETs are more commonly used as . . . . . . . . a. Switches b. Buffers c. Capacitors d. Resistors 45 / 50 45. In nMOS fabrication, etching is done using . . . . . . . . . a. Sodium chloride b. Plasma c. Hydrochloric acid d. Sulphuric acid 46 / 50 46. What are the advantages of E-beam masks? a. Looser layer b. Larger feature size c. Complex design d. Small feature size 47 / 50 47. Which is used for the interconnection? a. Aluminium b. Oxygen c. Silicon d. Boron 48 / 50 48. The dopants are introduced in the active areas of silicon by using which process? a. Either Diffusion or Ion Implantation Process b. Diffusion process c. Chemical Vapour Deposition d. Ion Implantation process 49 / 50 49. Contact cuts are made in . . . . . . . . . a. Diffusion layer b. Metal layer c. Drain d. Source 50 / 50 50. Surface mobility depends on . . a. Effective source voltage b. Channel length c. Effective gate voltage d. Effective drain voltage Your score is LinkedIn Facebook VKontakte 0% Restart quiz Exit Anonymous feedback Thank you Send feedback Spread the love
