81. Current employed in resistance welding ranges from __________ kVA/cm² .
A. 1.2 to 2.5
B. 4.5 to 6.2
C. 7.5 to 8.5
D. 10.5 to 15.5
✅ The correct answer is option B.
Engineering
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82. The tensile strength of plastics ranges from __________ kg/mm².
A. 10 to 50
B. 50 to 100
C. 0.01 to 0.1
D. 0.1 to 10
✅ The correct answer is option D.
83. In a good rimming steel
A. Carbon and silicon should be low
B. Silicon should be low but carbon should be high
C. Both silicon & carbon should be high
D. Silicon should be high but carbon should be low
✅ The correct answer is option A.
84. A thermally thin body is the one for which
A. Biot number is less than 0.1
B. Gallileo number is less than 0.1
C. Fourier number is less than 0.1
D. Fourier number is greater than 0.1
✅ The correct answer is option A.
85. A simple closed grinding circuit may consist of
A. A ball mill and a classifier
B. A rod mill and a hydrocyclone
C. A jaw crusher and a hydrocyclone
D. A ball mill and a froth floatation cell
✅ The correct answer is option A.
86. An ideal material for making cooking vessels should have
A. High heat capacity
B. Low heat capacity
C. High thermal conductivity
D. Both B and C
✅ The correct answer is option D.
87. Normalising does not __________ of a metal.
A. Improve machinability & tensile strength
B. Remove internal stresses
C. Refine the structure
D. Remove strains caused by cold working
✅ The correct answer is option B.
88. On an average __________ fast neutrons are produced by nuclear fission of each atom of uranium⁻²35.
A. 1
B. 2.5
C. 3.5
D. 5
✅ The correct answer is option B.
89. Which of the following is not a principal alloying element for the structural steel?
A. Molybednum
B. Nickel
C. Manganese
D. Chromium
✅ The correct answer is option A.
90. Fluorine is not a constituent of
A. Freon
B. Chloroform
C. Teflon
D. Fluorocarbons
✅ The correct answer is option B.