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Engineering :: Machine Design

91.  The diameter of rivets for 20 mm thick plates would be
A. 10 mm B. 15 mm
C. 20 mm D. 30 mm
E. 40 mm    
92.  The edges of boiler plates for fullering and caulking are bevelled at an angle of
A. 30? B. 45?
C. 60? D. 70?
E. 80?    
93.  The edge of the plates for boilers and tanks are usually bevelled at an angle of 80?
A. To reduce stress concentration B. For safety
C. To facilitate joining D. For fullering and caulking
E. None of the above    
94.  The rivet diameter should be
A. Half the plate thickness B. Less than the plate thickness
C. Equal to the strap thickness D. Equal to the plate thickness
E. More than plate thickness    
95.  In case of quadruple riveted butt joints the joint efficiency is usually assumed in the range
A. 40-50% B. 50-60%
C. 60-75% D. 75-85%
E. 85-95%    
96.  Lowest value of joint efficiency is assumed in case of
A. Single riveted butt joints B. Double riveted butt joints
C. Single riveted lap joints D. Double riveted lap joints
E. None of the above    
97.  Aircraft body is
A. Welded structure B. Riveted structure
C. Cast structure D. Precast structure
E. None of the above    
98.  Rivets are made of
A. Brittle material B. Ductile material
C. Soft material D. Hard material
E. None of the above    
99.  Rivets are
A. Heated before inserting in position B. Heated after inserting in position
C. Not heated at all D. Cold forged
E. None of the above    
100.  Commonly adopted material for rivets in
A. Mild steel B. Cast iron
C. Wrought iron D. Malleable iron
E. None of the above    

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