70751. The ratio of ages of A and B ten years ago was 2:If the ratio of their present age is 3:4,then how old Is B now?
70752. If the remainder obtained by subtracting a number from its own square is 2 times the number,what is the number?
70753. If 100 is 20% of a number,then what the 120% of the number is?
70754. The next number in the following sequence is:10,20,32,46,62,----------
70755. Cast iron is a
70756. The hardness is the property of a material due to which it
70757. Malleable cast iron is produced
70758. Smelting is the process of
70759. The percentage of carbon in cast iron varies from
70760. The ability of a material to absorb energy in the plastic range is called
70761. If sin A=3/5,then tan A=
70762. A material is said to be allotropic, if it has
70763. Closed packed hexagonal space lattice is found in
70764. The hardness and tensile strength in austenitic stainless steel can be increased by
70765. The quenching of steel from the upper critical point results in a fine grained structure.
70766. An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and
70767. Which of the following has a fine gold colour and is used for imitation jewellery?
70768. When the steel is normalised, its
70769. White cast iron has a high tensile strength and a low compressive strength.
70770. Dye penetrant method is generally used to locate
70771. The charge is fed into the blast furnace through the
70772. A small percentage of boron is added to steel in order to
70773. Which of the following process of steel making is in operation at Tata Iron and Steel Works, Jamshedpur?
70774. The unit cells
70775. Tungsten when added to steel __________ the critical temperature.
70776. Silicon when added to copper improves
70777. The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is
70778. Cast iron is manufactured in
70779. The lower critical point for all steels is
70780. Haematite iron ore contains iron about
70781. The material in which the atoms are arranged regularly in some directions but not in others, is called
70782. The steel produced by bessemer or open hearth process is __________ to that produced by L-D process.
70783. Crystal structure of a material is, generally, examined by
70784. Iron-carbon alloys containing 1.7 to 4.3% carbon are known as
70785. The coke in the charge of blast furnace
70786. Nimonic contains __________ percentage of nickel as that of Inconel.
70787. The heat treatment process used for softening hardened steel is
70788. The dieing down of a white flame during the operation of a bessemer converter indicates that the air is burning out silicon and manganese.
70789. The electric process of steel making is especially adopted to
70790. Iron ore is, usually, found in the form of
70791. The hardness of steel increases if it contains
70792. In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled
70793. Ferrite and pearlite makes the steel soft and ductile.
70794. The lower critical temperature
70795. Nodular cast iron is produced by adding __________ to the molten cast iron.
70796. Free carbon in iron makes the metal
70797. The cupola is used to manufacture
70798. The type of space lattice found in gamma-iron is
70799. The property of a material due to which it breaks with little permanent distortion, is called
70800. Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?