Quiz: Mechanical Engineering
Exam: NHPC JE
Each question carries 1 mark
Negative marking: 1/4 mark
Time: 6 Minutes
Q1. Large size bolt heads are made by
Q2. The temperature of wrought iron in forging is………………
Q3. Which process is used to improve fatigue resistance of the metal by setting up compressive stresses in its surfaces?
(a) Cold peening
(b) Cold heading
(c) Hot piercing
Q4. Anvil is made of which of the following metal?
(a) Mild steel
(b) Cast steel
Q5. The operation of producing cup shaped parts from flat sheet metal blanks by bending and plastic flow of metal is know
Q6. Which of the following has maximum ductility?
(b) Mild Steel
(c) Cast Iron
(d) 18-4-1 Steel
Sol. Large size head bolts are manufactured by the technique of UPSET FORGING.
Sol. Wrought iron is an alloy of iron which contain very less amount of carbon in it so it is always forged temperature below 13000C. So, option A is correct which is nearest to the 13000C.
Sol. Cold peeing technique is used to increase the fatigue strength by setting up compressive stresses on the surface of the component. It is also known as short peening.
Sol. Anvil is made of cast steel.
Sol. Copper is more ductile material from the given option.