Deck 2: Fabrication, Machining and Colloidal Routes

Question 1

What's the procedure in Top-down fabrication method?

A)nano-particles -> powder -> bulk
B)powder -> bulk - > nano-particles
C)bulk -> powder - > nano-particles
D)nano-particle - > bulk -> powder

Answer 1

bulk -> powder - > nano-particles

Question 2

Which of the following is an example of Bottom Up approach?

A)attrition
B)colloidal dispersion
C)milling
D)etching

Answer 2

colloidal dispersion

Question 3

For milling operations, what kind of environment is preferred?

A)acidic
B)basic
C)active
D)inert

Answer 3

inert

Question 4

What kind of metals are used for milling operations?

A)soft and brittle
B)soft and elastic
C)hard and brittle
D)hard and elastic

Question 5

The following flow chart is for which method?

A)milling
B)attrition
C)pattering
D)microfabrication

Question 6

CVD stands for                          

A)carbon vapour density
B)chemical vapour density
C)chemical vapour deposition
D)carbon vapour deposition

Question 7

Photolithography is a type of patterning technique.

Question 8

Chemical solution deposition is also known as                          

A)sol-gel
B)cvd
C)plasma spraying
D)laser pyrolysis

Question 9

Typical precursor used in sol-gel are

A)metal oxides
B)metal dioxides
C)metal alkoxides
D)metal fluorides

Question 10

The following is a bottom-up process.

Question 11

Particles of ZrO2, Y2O2 and Nano whiskers have been produced by                      

A)sol-gel
B)cvc
C)plasma spraying
D)laser pyrolysis

Question 12

Which gas serves as buffer gas in Laser ablation?

A)nitrogen
B)oxygen
C)helium
D)neon

Question 13

Which of the following is an unconventional process of machining?

A)milling
B)usm
C)drilling
D)none of the mentioned

Question 14

Ultrasonic machining process can be used for

A)conductors
B)insulators
C)metals
D)all of the mentioned

Question 15

Which of the following is a conventional process of machining?

A)electro chemical machining
B)electron beam machining
C)ultrasonic machining
D)none of the mentioned

Question 16

For machining of plastic material which of the unconventional process can be used effectively?

A)electro chemical machining
B)electron beam machining
C)ultrasonic machining
D)none of the mentioned

Question 17

Material removal rate in USM increases with

A)decrease in volume of work material per impact
B)increase in volume of work material per impact
C)decrease in frequency
D)decrease in number of particle making impact per cycle

Question 18

Material removal rate in USM increases with

A)decrease in volume of work material per impact
B)decrease in volume of work material per impact.
C)decrease in frequency
D)increase in number of particle making impact per cycle

Question 19

Material removal rate in USM increases with

A)decrease in volume of work material per impact
B)decrease in volume of work material per impact.
C)increases in frequency
D)decreases in the number of particle making impact per cycle

Question 20

Element of machine which is used to convert high frequency electrical impulse into mechanical vibration in USM is known as

A)tool
B)feeding unit
C)transducer
D)none of the mentioned

Question 21

Which of the following elements of USM is used to apply working force during machining operation?

A)tool
B)feeding unit
C)transducer
D)none of the mentioned

Question 22

Material removal rate in USM increases with

A)decrease in amplitude
B)decrease in grain size of abrasives
C)decrease in frequency
D)increase in amplitude

Question 23

Which of the following is a characteristic of a colloid?

A)it forms 2 layers with a solution
B)it forms turbid layers
C)it forms heterogeneous layer
D)it forms a homogeneous layer

Question 24

Where does colloidal solution find application in?

A)in milk industries
B)in chromatic chemical industries
C)in crystallography
D)in textiles