21. Which one of the following ceramic composite has high melting temperature?
(a) Fibre glass
(b) Borosilicate
(c) Glass-ceramic
(d) Fused silica
Answer: (d)
23. Which one of the following ferromagnetic material has the high critical temperature?
(a) Lead
(b) Tungsten
(c) Titanium
(d) Tin
Answer: (a)
24. Which one of the following is not a hard magnetic material?
(a) Tungsten steel
(b) Cobalt steel
(c) Barium ferrite
(d) Commercial iron
Answer: (d)
25. Consider the following properties for high temperature structural material:
1. Superior Oxidation Resistance
2. Superior Creep Resistance
3. High Hardness
4. Good Mechanical Strength
(a) Lead
(b) Tungsten
(c) Titanium
(d) Tin
Answer: (a)
(a) Tungsten steel
(b) Cobalt steel
(c) Barium ferrite
(d) Commercial iron
Answer: (d)
1. Superior Oxidation Resistance
2. Superior Creep Resistance
3. High Hardness
4. Good Mechanical Strength
Which one of the following materials is having the potential to satisfy the above properties?
(a) Silicon carbide
(b) Ceramic
(c) Zirconia
(d) Alumina
Answer: (a)
26. In order to make optimum method for certain set of nano-structure patterns, materials and volume requirements which of the following steps of processes are involved?
1. Interference Lithography
2. Electron-Beam Lithography
3. Nano-Patterned Replication
(a) 1, 2 and 3
(b) 1 and 2 only
(c) 1 and 3 only
(d) 2 and 3 only
Answer: (a)
27. If a low pass filter has an input S/N of 20 and the input voltage is 3 mV then the noise voltage will be:
(a) 0.77 mV
(b) 0.67 mV
(c) 0.57 mV
(d) 0.47 mV
Answer: (b)
28. Consider the following set of independent current measurements:
10.03𝐴 , 10.10 𝐴, 10.11 𝐴, and 10.08 𝐴
The average range of error will be:
(a) ± 0.04 𝐴
(b) ± 0.03 𝐴
(c) ± 0.02 𝐴
(d) ± 0.05 𝐴
Answer: (a)
29. Electromagnetic damping is because of:
1. Friction produced owing to motion of coil in the air surrounding it
2. The induced effects when the coil moves in the magnetic field and closed path is provided for current to flow
3. Dissipation of energy of rotation
(a) Silicon carbide
(b) Ceramic
(c) Zirconia
(d) Alumina
Answer: (a)
1. Interference Lithography
2. Electron-Beam Lithography
3. Nano-Patterned Replication
(a) 1, 2 and 3
(b) 1 and 2 only
(c) 1 and 3 only
(d) 2 and 3 only
Answer: (a)
(a) 0.77 mV
(b) 0.67 mV
(c) 0.57 mV
(d) 0.47 mV
Answer: (b)
10.03𝐴 , 10.10 𝐴, 10.11 𝐴, and 10.08 𝐴
The average range of error will be:
(a) ± 0.04 𝐴
(b) ± 0.03 𝐴
(c) ± 0.02 𝐴
(d) ± 0.05 𝐴
Answer: (a)
1. Friction produced owing to motion of coil in the air surrounding it
2. The induced effects when the coil moves in the magnetic field and closed path is provided for current to flow
3. Dissipation of energy of rotation
(a) 1 only
(b) 2 only
(c) 3 only
(d) 1, 2 and 3
Answer: (b)
30. A mild steel torsion bar of 30 𝑚𝑚 diameter is used for measurement of a torque of 100 Nm. If the shear modulus of mild steel is 80 GN/metre square, the angle of twist will be nearly:
(b) 2 only
(c) 3 only
(d) 1, 2 and 3
Answer: (b)
Answer: (d)
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