1
GATE ME 2008
+2
-0.6
A compression spring is made of music wire of $$20$$ mm diameter having a shear strength and shear modulus of $$800$$ MPa and $$80$$ GPa respectively. The mean coil diameter is $$20$$ mm, free length is $$40$$ mm and the number of active coils is $$10.$$ If the mean coil diameter is reduced to $$10$$ mm, the stiffness of the spring is approximately
A
Decreases by $$8$$ times
B
Decreases by $$2$$ times
C
Increases by $$2$$ times
D
Increases by $$8$$ times
2
GATE ME 2005
+2
-0.6
A weighing machine consists of a 2 kg pan resting on a spring in this condition, with the pan resting on the spring, the length of the spring is 200 mm. When a mass of 20 kg is placed on the pan, the length of the spring becomes 100 mm. For the spring, the un-deformed length L and the spring constant K (stiffness) are
A
L $$=$$ 220 mm, K $$=$$ 1862 N/m
B
L $$=$$ 210 mm, K $$=$$ 1960 N/m
C
L $$=$$ 200 mm, K $$=$$ 19860 N/m
D
L $$=$$ 200 mm, K $$=$$ 2156 N/m
GATE ME Subjects
Engineering Mechanics
Strength of Materials
Theory of Machines
Engineering Mathematics
Machine Design
Fluid Mechanics
Turbo Machinery
Heat Transfer
Thermodynamics
Production Engineering
Industrial Engineering
General Aptitude
EXAM MAP
Joint Entrance Examination