81. A lead screw with half nuts in a lathe, free to rotate in both directions has

1. 1. V-A threads

   
   
   

   2. With worth threads

   
   
   

   3. Buttress threads

   
   
   

   4. Acme threads

   
   
   

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1. View Hint View Answer Discuss in Forum

   Acme threads

   Correct Option: D

   Acme threads

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82. The time taken to drill a hole through a 25 mm thick plate with the drill rotating at 300 rpm and moving at a feed rate of 0.25 mm/rev is

1. 1. 10 sec

   
   
   

   2. 20 sec

   
   
   

   3. 60 sec

   
   
   

   4. 100 sec

   
   
   

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1. View Hint View Answer Discuss in Forum

   T =	L	=	25100	=	1	min
   	fN		0.25 × 300		3

   
   T = 20 sec

   Correct Option: B

   T =	L	=	25100	=	1	min
   	fN		0.25 × 300		3

   
   T = 20 sec

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83. Match the following
    

    Process	Media used
    A. EDM	1. Electrolyte
    B. ECM	2. Dielectric
    3. Abrasive slurry	3. Machinability
    D. EBM	4. Vacuum

1. 1. A–1, B–2, C–3, D–4

   
   
   

   2. A–2, B–1, C–3, D–4

   
   
   

   3. A–4, B–3, C–2, D–1

   
   
   

   4. A–3, B–4, C–1, D–2

   
   
   

   5. A–3, B–4, C–2, D–1

   
   
   

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1. View Hint View Answer Discuss in Forum

   A–2, B–1, C–3, D–4
   EDM – Dielectric
   ECM – Electrolyte
   USM – Abrasive slurry
   EBM – Vaccum.

   Correct Option: B

   A–2, B–1, C–3, D–4
   EDM – Dielectric
   ECM – Electrolyte
   USM – Abrasive slurry
   EBM – Vaccum.

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84. During pure orthogonal turning operation of a hollow cylindrical pipe, it is found that the thickness of the chip produced is 0.5 mm. The feed given to the zero degree rake angle tool is 0.2 mm/rev. The shear strain produced during the operation is__________

1. 1. V = 1.9

   
   
   

   2. V = 4

   
   
   

   3. V = 2.9

   
   
   

   4. V = 2

   
   
   

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1. View Hint View Answer Discuss in Forum

   

   Correct Option: C

   

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85. To obtain dimension of 61.18 mm using slip gauges, the most appropriate combination is

1. 1. 1.18 + 50.00 + 10.00

   
   
   

   2. 0.08 + 1.10 + 60.00

   
   
   

   3. 1.08 + 0.10 + 50.00 + 10.00

   
   
   

   4. 1.08 + 1.10 + 50.00 + 9.00

   
   
   

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1. View Hint View Answer Discuss in Forum

   Normally, slip gauge box set does not have slip of less than 1 mm thickness.

   Correct Option: A

   Normally, slip gauge box set does not have slip of less than 1 mm thickness.

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