VLSI Design and Technology MCQ with Answers [61-80].

61. ....... is sputtered on the whole wafer.

A) Calcium
B) potassium
C) Alluminium
D) Sillicon

... Answer is C)
Explanation: Aluminium is sputtered on the whole wafer before removing the excess metal from the wafer.

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62. What are the features of BiCMOS?

A)high input impedance
B) Low input impedance
C) high packing density
D) Bidirectional

... Answer is B)
Explanation: Some of the features of BiCMOS are low input impedance, low packing density, unidirectional, high output drive current, etc.

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63. An Antifuse programming technology is predominantly associated with ........

A) SPLDs
B) FPGAs
C) CPLDs
D) All of the above

... Answer is B)
An Antifuse programming technology is predominantly associated with FPGAs.

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64. In Gray coding, when the state machine changes state, .......... bit/s in the state vector changes the value.

A) One
B) Two
C) Three
D) Four

... Answer is A)
In Gray coding, when the state machine changes state, One bit/s in the state vector changes the value.

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65. Why is the use of mode buffer prohibited in the design process of synthesizer?

A)To prevent the occurrence of glitches & metastability
B) To avoid mixing of clock edges
C) Because Maximum ASIC vendors fail to support mode buffer in libraries
D) Because critical path has preference in placement

... Answer is C)
No explanation

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66. What is the Long form of VHDL?

A) Very High Super Hardware Description Language
B) Very High speed Horizontal Description Language
C) Very Large Scale High spread Hardware Description language
D) Very High Speed Hardware Description Language

... Answer is D)
Long form of VHDL is Very High Speed Hardware Description Language.

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67. which statement is true

A) package store in STD_LOGIC library
B) procedure return many values
C) case statement use in structural modeling
D) function return maximum values

... Answer is B)
Procedure returns many values.

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68. Stick diagrams are those which convey layer information through?

A) thickness
B) Color codes
C) Shapes
D) Layers

... Answer is B)
Stick diagrams are those which convey layer information through color codes. Thickness is not considered in this stick diagram representation.

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69. Which color is used for implant?

A) Blue
B) Green
C) Red
D) Yellow

... Answer is D)
Yellow color is used for implant.

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70. Which color is used for n-diffusion?

A) Blue
B) Green
C) Red
D) Yellow

... Answer is B)
Explanation: Green color is used to show the presence of n-diffusion layer. The n-type diffusion will dope the source or drain region in the p-well region.

71. Which color is used for polysilicon?

A) Green
B) Red
C) Yellow
D) Brown

... Answer is B)
Explanation: Red is used to represent polysilicon layers. It is a semi-conductor like material and is a hyper pure form of silicon.

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72. Which color is used for contact areas?

A)Brown
B) Black
C) Red
D) Blue

... Answer is B)
Explanation: Black color is used to represent contact areas. This is the part where two different touch or cross each other.

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73. Which color is used for buried contact?

A) White
B) Green
C) Black
D) None of the above

... Answer is D)
Explanation: Brown color is used to represent buried contact. Buried contact is most widely used, subject to fewer design rule restrictions are smaller in area.

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74. Which color is used for polysilicon 2?

A) Blue
B) Green
C) Orange
D) Black

... Answer is C)
Explanation: Orange color is used to represent polysilicon-2 layer.

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75. n and p transistors are separated by using ......

A) differentiation line
B) demarcation line
C) separation line
D) Black line

... Answer is B)
Explanation: Demarcation line separates n and p transistors. Demarcation line is similar to dotted line in brown.

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76. Which color is used for buried contact?

A)Black
B) Brown
C) Yellow
D) None of the above

... Answer is B)
Explanation: Brown color is used to represent buried contact. Buried contact is most widely used, subject to fewer design rule restrictions are smaller in area.

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77. .......... layer should be over ....... layer.

A) polysilicon, ntype
B) ntype, ptype
C) ntype, polysilicon
D) ptype, ntype

... Answer is A)
Explanation: Polysilicon layer should be over n-type layer. This is the standard pattern used in stick diagram representation.

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78. ......... is nonsynthesizable statement

A) structural modeling style in VHDL
B) interger data type in entity
C) for loop statement in vhdl
D) variable data object in VHDL

... Answer is B)
Integer data type in entity.

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79. What is the mean of mealy machine?

A) output depends on input as well as present state
B) output depends on present state only
C) output depends on clock signal only
D) None of the above

... Answer is A)
No explanation.

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80. Design rules does not specify .......

A) separations
B) Extensions
C) Colors
D) None of the above

... Answer is C)
Explanation: Design rules specify line widths, separations and extensions in terms of lambda.

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