1) Match the following group 1 items (crystal structures) with group 2 items (average number of atoms per unit cell) and select the correct option
1. Simple cubic crystal structure ----------------- A. 2
2. Body centered crystal structure --------------- B. 6
3. Face centered crystal structure ---------------- C. 1
4. Hexagonal close packed structure ------------ D. 4
a. 1 – A, 2 – C, 3 – D, 4 – B
b. 1 – C, 2 – A, 3 – D, 4 – B
c. 1 – B, 2 – A, 3 – C, 4 – D
d. 1 – D, 2 – A, 3 – B, 4 – C
|
2) Body centered cubic structure has an atomic packing factor equal to
a. 0.74
b. 0.68
c. 0.52
d. None of the above
|
3) In which type of point defect, positive and negative ions are missing from the crystal?
a. Vacancy defect
b. Interstitial defect
c. Schottky defect
d. Substitutional defect
|
4) Energy required for deformation can be calculated using the formula
a. E = L2 G b
b. E = L G b2
c. E = L (Gb)2
d. E = L G b
|
5) What is meant work hardening process?
a. Ductile materials are deformed plastically at temperatures below crystalline temperatures which increases strength and hardness of the material
b. Ductile materials are deformed plastically at temperatures above crystalline temperatures which increases strength and hardness of the material
c. Ductile materials are deformed plastically at crystalline temperatures which increases strength and hardness of the material
d. None of the above
|
Answer
Explanation
Related Ques
|
ANSWER: Ductile materials are deformed plastically at temperatures below crystalline temperatures which increases strength and hardness of the material
Explanation:
No explanation is available for this question!
|
|
6) Match the following group 1 items(rubbers) with group 2 items (Rubber formation) and select the correct option
1. Nitrate rubbers ----------------------------------- A. copolymerization of butadiene and styrene
2. Butadiene rubbers ------------------------------- B. polymerization of isobutylene with isoprene
3. Neoprenes ----------------------------------------- C. copolymerization of butadiene and crylonitrite
4. Butyl rubbers ------------------------------------- D. polymerization of chloroprene molecules
a. 1 – A, 2 – D, 3 – B, 4 - C
b. 1 – B, 2 – C, 3 – D, 4 - A
c. 1 – C, 2 – A, 3 – D, 4 – B
d. 1 – C, 2 – B, 3 – A, 4 - D
|
7) What are thermoplastics?
a. They are nonlinear polymers, in which rise in temperature increases plasticity
b. They are linear polymers, in which rise in temperature increases plasticity
c. They are linear polymers, in which temperature rise has no effect on plasticity
d. None of the above
|
Answer
Explanation
Related Ques
|
ANSWER: They are linear polymers, in which rise in temperature increases plasticity
Explanation:
No explanation is available for this question!
|
|
8) What happens when thermosetting polymers are heated?
a. They become soft
b. They are deformed
c. They become rigid
d. All of the above
|
9) Which among the following is the characteristics of polymers?
a. High tensile strength
b. High coefficient of friction
c. Low density
d. All of these
|
10) How is Ester produced?
a. Addition polymerization
b. Condensation polymerization
c. Substitutional polymerization
d. None of these
|
11) Which among the following is a type of destructive test?
a. Magnetic particle test
b. Cupping test
c. Dye penetrant
d. All of the above
|
12) Up to which point in the graph shown below, Hooke's Law is obeyed?
a. Up to point D
b. Up to point A
c. Up to point B
d. Up to point X
|
13) At which point elastic limit is observed in stress strain curve shown below
a. Point B
b. Point D
c. Point A
d. None of the above
|
14) Stress strain curve is shown below. Beyond point B, metal undergoes
a. less elastic deformation and more plastic deformation
b. only elastic deformation
c. more elastic deformation and less plastic deformation
d. only plastic deformation
|
15) What is meant by resilience in stress strain curve?
a. area in the plastic region
b. area in the elastic region
c. area in elastic and plastic region
d. none of the above
|
16) Non-destructive testing is used to determine
a. location of defects
b. chemical composition
c. corrosion of metal
d. All of these
|
17) Which among the following is not a type of Non-destructive testing?
a. compression test
b. visual testing
c. ultrasonic testing
d. eddy current testing
|
18) Identify the type of destructive testing
a. Radiographic test
b. Dye penetrant test
c. Creep test
d. All of the above
|
19) Which among the following is the last step in magnetic particle test method?
a. observation and inspection
b. circular magnetization
c. demagnetization
d. magnetization
|
20) Which of the following statements is/are true for ultrasonic test?
a. Equipment used for ultrasonic testing is portable
b. Complicated shapes can be easily scanned
c. Waves generated are health hazardous
d. All the above statements are true
|
Answer
Explanation
Related Ques
|
ANSWER: Equipment used for ultrasonic testing is portable
Explanation:
No explanation is available for this question!
|
|
21) Before compacting the metals, which process is annealed to remove the effects of cold working?
a. Machining
b. Crushing
c. Shotting
d. All of these
|
22) Which of the following statements is true for green density?
a. Green density increases when particle strength increases
b. Green density decreases when compacting speed decreases
c. Green density increases when compaction pressure increases
d. Green density decreases when apparent density increases
|
Answer
Explanation
Related Ques
|
ANSWER: Green density increases when compaction pressure increases
Explanation:
No explanation is available for this question!
|
|
23) The formula used to calculate green strength (S) is
a. (2 B T) / (3 ω L)
b. (3 ω L) / (2 B T2)
c. (3 ω L) x (2 B T2)
d. (3 ω L) x (2 B T)
|
24) Match the following group 1 items (Method of atomization) with group 2 items (Application) and select the correct option
1. D. P. G. Process ----------------------------------- A. Copper tube
2. Mannesmann process ---------------------------- B. Aerospace
3. Dissolved gas atomization ---------------------- C. Electronic framework
4. Rotating electrodes atomization --------------- D. Aluminum powder as solid rocket fuel
a. 1 – D, 2 – B, 3 – A, 4 – C
b. 1 – C, 2 – A, 3 – D, 4 – B
c. 1 – B, 2 – A, 3 – C, 4 – D
d. 1 – C, 2 – D, 3 – B, 4 – A
|
25) Which type of cermets are used as an substitute for Wc - Co alloy cutting tools?
a. Tic - base cermets
b. ThO2 - W
c. ThO2 - Mo
d. None of the above
|
