HPSSSC Junior Engineer Mechanical Contract basis Paper

Himachal Pradesh SSSC Junior Engineer Mechanical Contract basis Paper

The initial tension (in newton) in a bolt used for making a fluid tight joint like steam engine cover joints is calculated by which of the following relation in which ‘d’ is the nominal diameter of bolts in mm.
(a) 1420 d
(b) 1680 d
(c) 2080 d
(d) 2840 d

Welding takes place by
(a) Coalescence between the parts to be joined
(b) Surface joining the parts to be united by fusion of the filler rod
(c) Surface tension between two parts
(d) None of these

The core diameter of the thread is equal to which of the following in which ‘d’ is the diameter of the bolt ?
(a) 0.58 d
(b) 0.68 d
(c) 0.84 d
(d) 0.94 d

Square thread is usually found on
(a) spindle of bench vice
(b) railway carriage couplings
(c) feed mechanism of a machine tools
(d) screw outline lathes

The unit of modulus of elasticity is same as those of
(a) stress, strain and pressure
(b) stress, force and modulus of rigidity
(c) strain, force and pressure
(d) stress, pressure and modulus of rigidity

The shear force of a cantilever beam of length ‘;’ carrying a uniformly distributed load of wper unit length is _________at the free end.
(a) zero
(b) wl/4
(c) wl/2
(d) wl

The hoop stress in a thin cylinderical shell is
(a) longitudinal stress
(b) compressive stress
(c) radial stress
(d) circumferential tnesile stress

The assumpiton made in Euler’s column theory is that
(a) the failure of the column occur due to buckling alone
(b) the length of the column is very large as compared to its cross-section dimensions
(c) the column material obeys Hook’s law
(d) All of these

Euler’s column formula holds good for
(a) short columns
(b) long columns
(c) both short and long columns
(d) weak columns

A column is said to be short column, when
(a) its length is very small
(b) its corss-sectional area is small
(c) the ratio of its length to the least radius of gyration is less than 80
(d) the ratio of its length to the least radius of gyration is more than 80

The material in which the atoms are arranged chaotically is called
(a) Amorphous material
(b) Mesomorphous material
(c) Crystalline material
(d) None of these

The material in which the atoms are arranged regulary in some directions but not in orders is called
(a) Amorphous material
(b) Mesomorphous material
(c) Crystalline material
(d) None of these

The purpose of heat treatment is to
(a) relieve the stresses set up in the material after hot or cold working
(b) modify the structure of the material
(c) change the gain size
(d) Any one of these

A perfect black body is one which
(a) is black in colour
(b) absorbs heat radiations of all weavelengths falling on it
(c) reflects all the heat radiations
(d) transmits the heat radiations

Reyonld number is the ratio of
(a) energy transferred by convection to that by conduction
(b) kinematic viscosity to the thermal conductivity
(c) inertia force to viscous force
(d) None of these