A. Constantan
B. Invar
C. Pewter metal
D. Monel metal
✅ The correct answer is option B.
Engineering MCQs
The best criterion for analysing an economic investment is the
A. Rate of return criterion
B. Present value method
C. Salvage value
D. Future value method
✅ The correct answer is option A.
Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when
A. Strain rate is increased
B. Grain size is increased
C. Prior cold deformation is increased
D. Not affected by any of the above parameters
✅ The correct answer is option A.
To counteract the bad effects of strain hardening on a cold formed part, it must be
A. Tempered
B. Normalised
C. Annealed
D. Hardened
✅ The correct answer is option C.
For infinite parallel planes having emis-sivities ε₁ & ε₂, the interchange factor for radiation from surface 1 to surface 2 is given by
A. (ε₁ + ε₂)/ε₁.ε₂
B. Ε₁.ε₂/(ε₁ + ε₂ – ε₁.ε₂)
C. Ε₁.ε₂
D. Ε₁ + ε₂
✅ The correct answer is option B.
Production of one ton of steel plate in a modern integrated steel plant in India consumes about __________ kWh of electricity.
A. 50
B. 250
C. 450
D. 850
✅ The correct answer is option C.
Electrochemical corrosion occurs
A. Where the liquid electrolytes containing free ions are present
B. Only in alloys
C. Only in pure metals
D. Due to direct chemical action of metal with oxygen
✅ The correct answer is option A.
The ratio of coil diameter to wire diameter of a spring is called the spring
A. Index
B. Deflection
C. Form co-efficient
D. None of these
✅ The correct answer is option A.
Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is
A. Very low which prevents their ignition by compression
B. Very high which prevents their ignition by compression
C. Zero
D. None of these
✅ The correct answer is option A.
Oxyacetylene reducing flame is used while carrying out welding on
A. Alloy steel
B. Grey cast iron
C. Mild steel
D. High carbon steel
✅ The correct answer is option C.