1141. Lead is poured into the joints between two __________ pipes.
A. Cast iron
B. Steel
C. Concrete
D. Plastic
✅ The correct answer is option A.
Engineering
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1142. Desalination of water
A. Makes it potable
B. Makes it non-potable
C. Means distillation of water
D. None of these
✅ The correct answer is option A.
1143. Shaft/rotor speed is most accurately measured by a
A. Frequency counter
B. Tachometer
C. Strobometer
D. Speedometer
✅ The correct answer is option C.
1144. Knocking tendency in a petrol engine decreases with increasing
A. Supercharging
B. Compression ratio
C. Wall temperature
D. Engine speed
✅ The correct answer is option D.
1145. Function of gear box is to
A. Reduce the speed
B. Obtain variable speed
C. Increase the speed
D. Produce high torque
✅ The correct answer is option B.
1146. __________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
A. Beryllia
B. Zirconia
C. Alumina
D. Magnesia
✅ The correct answer is option C.
1147. __________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.
A. Lancing
B. Shot peening
C. Slugging
D. Spinning
✅ The correct answer is option B.
1148. Viscoelastic behaviour is observed in __________ materials.
A. Non-crystalline organic polymeric
B. Ceramic
C. All crystalline
D. All of the above
✅ The correct answer is option A.
1149. Routing in production, planning & control is concerned with the
A. Sequence of operation to be performed
B. Progress of work performed
C. Authorisation of work to be performed
D. Balancing of load on machines
✅ The correct answer is option A.
1150. For the irreversible reaction, Ca+ 2C = Ca C₂ , Δ H°298 = – 60000 J . mole⁻¹ . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be
A. 30000 J
B. 60000 J
C. 90000 J
D. 240000 J
✅ The correct answer is option C.