ক) threads for the nut at one end and head at the other end
খ) head at one end and the other end fits into a tapped hole of one of the parts to be fastened
গ) threads at both ends
ঘ) pointed threads
০৩। A bolt is designed on the basis of __________ with a large factor of safety.
ক) direct tensile stress
খ) direct compressive stress
গ) direct bending stress
ঘ) direct shear stress
০৪। A bolt of M 24 x 2 means that
ক) the pitch of the thread is 24 mm and depth is 2 mm
খ) cross-sectional area of the threads is 24 mm2
গ) the nominal diameter of bolt is 24 mm and pitch is 2 mm
ঘ) the effective diameter of bolt is 24 mm and there are 2 threads per cm
০৫। A bolt of uniform strength can be developed by
ক) keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
খ) keeping the core diameter smaller than the diameter of the unthreaded portion
গ) keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
ঘ) none of the above
০৬। A bushed pin flexible coupling is used to connect two shafts whose axes intersect at a small angle.
ক) Yes
খ) No
০৭। A castle nut is a locking device in which
ক) a thinner nut is tightened down over a thicker or main nut and the main nut is tightened against the thinner nut by loosening
খ) a slot is cut in line with the centre of each face and a split pin passes through two slots in the nut and a hole in the bolt, so that a positive lock is obtained unless the pin shears
গ) a slot is cut about half way through the nut and a small screw is tightened between the nut and the bolt in order to produce more friction
ঘ) the bottom cylindrical portion is recessed to receive the tip of the locking set screw
০৮। A chain drive transmits __________ power as compared to belt drive.
ক) more
খ) less
০৯। A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is
ক) 1 kN-m
খ) 2 kN-m
গ) 3 kN-m
ঘ) 4 kN-m
১০। A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ . The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be
ক) τ/2
খ) τ
গ) 2 τ
ঘ) 4 τ
১১। A column is known as a long column if the slenderness ratio is
ক) 40
খ) 50
গ) 70
ঘ) 100
১২। A column of length l is fixed at both ends. The equivalent length of the column is
ক) l/2
খ) l/2
গ) l
ঘ) 2 l
১৩। A compound belt drive is used when
ক) shafts are arranged parallel and rotate in the opposite directions
খ) shafts are arranged parallel and rotate in the same directions
গ) shafts are arranged at right angles and rotate in one definite direction
ঘ) none of the above
১৪। A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, The junction radius is 60 mm and the junction pressure is 1.1 N/mm2. The maximum hoop stress developed in the inner cylinder is
ক) 3.6 N/mm2 compression
খ) 3.6 N/mm2 tension
গ) 7.2 N/mm2 compression
ঘ) 7.2 N/mm2 tension
১৫। A connecting rod is designed as a
ক) long column
খ) short column
গ) strut
ঘ) all of these
১৬। A connecting rod is four times strong in buckling about Y-axis than about X-axis.
ক) Agree
খ) Disagree
১৭। A connecting rod should be
ক) strong in buckling about X-axis
খ) strong in buckling about Y-axis
গ) equally strong in buckling about X-axis and Y-axis
ঘ) any one of the above
১৮। A connecting rod subjected to an axial load may buckle in the plane of motion of the connecting rod.
ক) Correct
খ) Incorrect
১৯। A connecting rod subjected to an axial load may buckle in the plane perpendicular to the plane of motion of the connecting rod.