631. A robot arm PQ with end coordinates P(0,0) and Q(2,5) rotates counter clockwise about P in the XY plane by 90°. The new coordinate pair of the end point Q is
     

1. 1. (–2,5)
      

   
   
   

   2. (–5,2)
      

   
   
   

   3. (–.5,-2)
      

   
   
   

   4. (2, –5)

   
   
   

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1. View Hint View Answer Discuss in Forum

   For the new coordinate pair
   

   	x'		=		cosθ		-sinθ			x
   	y'				sinθ		cosθ			y

   
   where (x',y') is coordinate at point θ.
   by putting θ = 90°
   

   	x'		=		0		-1			x		=		0		-1			2
   	y'				1		0			y				1		0			5

   
   

   	x'		=		-5
   	y'				2

   
   

   Correct Option: B

   For the new coordinate pair
   

   	x'		=		cosθ		-sinθ			x
   	y'				sinθ		cosθ			y

   
   where (x',y') is coordinate at point θ.
   by putting θ = 90°
   

   	x'		=		0		-1			x		=		0		-1			2
   	y'				1		0			y				1		0			5

   
   

   	x'		=		-5
   	y'				2

   
   

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632. For generating a Coon's surface we require
     

1. 1. a set of grid points on the surface
      

   
   
   

   2. a set of grid control points
      

   
   
   

   3. four bounding-curves defining the surface
      

   
   
   

   4. two bounding curves and a set of grid control points
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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633. In a 2–D CAD package, clockwise circular arc of radius 5, specified from P₁ (15, 10) to P₂ (10, 15) will have its center at
     

1. 1. (10, 10)
      

   
   
   

   2. (15, 10)
      

   
   
   

   3. (15, 15)
      

   
   
   

   4. (10, 15)

   
   
   

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1. View Hint View Answer Discuss in Forum

   Given : P1 (15, 10)
   P2 (10, 15)
   
   Clear from figure, Centre of arc having radius = 5 is (15, 15)
   

   Correct Option: C

   Given : P1 (15, 10)
   P2 (10, 15)
   
   Clear from figure, Centre of arc having radius = 5 is (15, 15)
   

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634. In computer aided drafting practice, an arc is defined by
     

1. 1. two end points only
      

   
   
   

   2. centre and radius
      

   
   
   

   3. radius and one end point
      

   
   
   

   4. two end points and centre

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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635. A shaft has a dimension, φ 35^-0.025-0.009 respective values of fundamental deviation and tolerance are
     

1. 1. –0.025, ± 0.008
      

   
   
   

   2. –0.025, 0.016
      

   
   
   

   3. –0.009, ± 0.008
      

   
   
   

   4. –0.009, 0.016

   
   
   

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1. View Hint View Answer Discuss in Forum

   Given: φ 35^{– 0.025– 0.009}
   Tolerance = upper deviation – lower deviation
   Tolerance = 0.025 – 0.009 = 0.016
   Fundamental deviation for basic shaft is lower deviation = – 0.009

   Correct Option: D

   Given: φ 35^{– 0.025– 0.009}
   Tolerance = upper deviation – lower deviation
   Tolerance = 0.025 – 0.009 = 0.016
   Fundamental deviation for basic shaft is lower deviation = – 0.009

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