ISRO SC/ENG 2009

 1) In nodular iron, graphite is in the form of

A. Spheroids
B. Nodular carbide
C. Flakes
D. Cementite

 2) Corrosion resistance of steel increases by addition of

A. Vanadium, aluminium
B. Sulpher, phosphorus, lead
C. Chromium and Nickel
D. Tungsten, molybdenum, vanadium, chromium

 3) Phenomenon of progressive extension of material with time at constant load is called

A. Plasticity
B. Creep
C. Yield
D. Breaking

 4) Rivets are made of

A. Soft material
B. Ductile material
C. Hard material
D. Brittle materialC

 5) Addition of copper to aluminium results in

A. Precipitation hardening system
B. Corrosion resistance
C. Grain refinement
D. High machinabilty

 6) In a hardness test, L is load in kg, D is diameter of ball in mm and d is diameter of indentation in mm. Brinell Hardness Number is expressed by the equation

A. BHN =
B. BHN
C. BHN
D. BHN

 7) A plane intersects thee co ordinates axes at x = 2/3, y = 1/3, z = 1/2. What is the Miller index of this plane?

A. (932)
B. (432)
C. (364)
D. (423)

 8) Following gases are used in tungsten inert gas welding

A. CO₂ and H₂
B. Argon and Neon
C. Argon and Helium
D. Helium and Neon

 9) Ring rolling is used to

A. To decrease thee thickness and increase diameter
B. To increase the thickness of a ring
C. For producing a seamless tube
D. For producing large cylinder

 10) The machining process in which the work piece is dissolved into an electrolyte solution is called

A. Electro-chemical machining
B. Ultrasonic machining
C. Electro-discharge machining
D. Laser machining

 11) In the metal forming process, the stresses encountered are

A. greater than yield strength but less than ultimate strength
B. Less than yield strength of the material
C. Greater than the ultimate strength of the material
D. Less than thee elastic limit

 12) A grinding wheel is specified as 49 A 26 36 M 7 V 24. The number 36 stands for

A. Structure
B. Grade
C. Grit size
D. bond

 13) Anodising is

A. A process od coating of zinc by hot dipping
B. A zinc diffusion process
C. A process used for making thin phosphate coatings on steel to act as a base or primer for enamels and paints
D. An oxidising process used for aluminium and magnesium articles

 14) Addition of copper to aluminium results in

A. Precipitation hardening system
B. Corrosion resistance
C. Grain refinement
D. High machinabilty

 15) The rake angle of a cutting tool is 15⁰, shear angle 45⁰ and cutting velocity 35 m/min. What is the velocity of chip along the tool face?

A. 25.3 m/min
B. 27.3 m/mm
C. 28.5 m/mm
D. 23.5 m/mm

 16) It is required to cut screw threads of 2 mm pitch on a lath. The lead screw has a pitch of 6 mm. If the spindle speed is 60 rpm, then the speed of the lead screw will be

A. 10 rpm
B. 20 rpm
C. 120 rpm
D. 180 rpm