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Engineering :: Machine Design


261.  The differential equation 10x + 200 x + 810x = 0 describes one degree of freedom system. The system is
A. Oscillatory B. Having critical damping
C. Having more than critical damping D. Having less than critical damping
E. None of the above    

262.  The differential equation 10x + 9 x + 810x = 0 describes a one degree of freedom system. The natural frequency of the system is
A. 9 cycles per second B. 9 radians per second
C. 90 cycles per second D. 90 sycles per second
E. 10 cycles per second    

263.  Which is the heaviest metal?
A. Mild steel B. High speed steel
C. Lead D. Gold
E. Platinum    

264.  A spring deflects 50 mm under a 250 kg load. If the load is applied gradually, the energy absorbed by the spring will be
A. 625 kg-cm B. 1250 kg-cm
C. 2500 kg-cm D. 312.5 kg-cm
E. 1050 kg-cm    

265.  If a machine member is loaded in such a way that the three principal stresses at a point are 600 kg/cm2 tension, 800 kg/cm2 compression and zero. The maximum shear stress at the point will be
A. 1000 kg/cm2 B. 800 kg/cm2
C. 600 kg/cm2 D. 400 kg/cm2
E. 200 kg/cm2    

266.  If machine number is loaded in such a way that the three principla stresses at a point are 600 kg/cm2 compression. 800 kg/cm2 tension and zero. The maximum shear stress at the point will be
A. 1000 kg/cm2 B. 800 kg/cm2
C. 600 kg/cm2 D. 700 kg/cm2
E. 200 kg/cm2    

267.  A simple supported steel beam when loaded with a force of 100 kg at A is found to deflect 10 mm at B. What force at B would cause a deflection of 2.5 mm at A
A. 400 kg B. 100 kg
C. 50 kg D. 25 kg
E. 10 kg    

268.  Sand drops from the bottom of a hopper into a horizontally moving belt conveyor. If the conveyor is travelling at 2000 fpm and the sand is fed at the rate of 1500 1b/min, the force necessary to drive the conveyor would be
A. Zero B. 258 lb
C. 516 lb D. Cannot be determined from the given data

269.  Which of the following fit can be used for interchangeable assembly
A. Wringing B. Sung
C. Tight D. Medium force

270.  Which of the following is not a symmetrical section
A. Circular B. 1 beam with equal flanges
C. Equal angle iron D. All of the above




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