266. The time for one cycle, in milliseconds, is

1. 1. 0.55

   
   
   

   2. 0.32

   
   
   

   3. 0.89

   
   
   

   4. 0.24

   
   
   

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1. View Hint View Answer Discuss in Forum

   Cycle time:
   

   Tc = R.C.In		Vs
   		Vs – Vd

   
   

   = 40 × 20 × 10-6 × In		220
   		220 – 110

   
   T_c = .55 miliseconds.

   Correct Option: A

   Cycle time:
   

   Tc = R.C.In		Vs
   		Vs – Vd

   
   

   = 40 × 20 × 10-6 × In		220
   		220 – 110

   
   T_c = .55 miliseconds.

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267. Match the following
     Group-I
     P. Permaloy
     Q. Dielectric
     R. Accumulator
     S. Anodic erosion
     Group-II
     1. EDM
     2. USM
     3. De-ionized water
     4. Water jet machining

1. 1. P Q R S
      3 4 1 2

   
   
   

   2. P Q R S
      2 3 4 1

   
   
   

   3. P Q R S
      4 1 2 3

   
   
   

   4. P Q R S
      2 3 1 4

   
   
   

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1. View Hint View Answer Discuss in Forum

   P–2, Q–3, R–4, S–1

   Correct Option: B

   P–2, Q–3, R–4, S–1

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268. Match List-I (Machining processes) with List-II (Operating Media) and select the correct answer using the codes given below the lists:
     List-I
     A. Abrasive jet machining
     B. Electron beam machining
     C. Electrochemical machining
     D. Electro-discharge machining
     List-II
     1. Dielectric
     2. Electrolyte
     3. Abrasive slurry
     4. Vacuum
     5. Air

1. 1. A B C D
      5 4 2 1

   
   
   

   2. A B C D
      4 5 2 1

   
   
   

   3. A B C D
      4 2 3 5

   
   
   

   4. A B C D
      2 5 3 4

   
   
   

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1. View Hint View Answer Discuss in Forum

   A–5, B– 4, C–2, D–1

   Correct Option: A

   A–5, B– 4, C–2, D–1

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269. Mechanism of material removal process
     P Abrasive grain throwing and hammering
     Q. Erosion due to vaporization
     R. Chipping and erosion
     S. Melting and partial vaporization
     T. Electrolysis
     1. ECM
     2. USM
     3. PAM
     4. EDM
     5. AJM

1. 1. P Q R S T
      3 2 5 1 4

   
   
   

   2. P Q R S T
      4 3 2 1 5

   
   
   

   3. P Q R S T
      2 4 5 3 1

   
   
   

   4. P Q R S T
      2 5 3 1 4

   
   
   

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1. View Hint View Answer Discuss in Forum

   P–2, Q–4, R–5, S–3, T–1

   Correct Option: C

   P–2, Q–4, R–5, S–3, T–1

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270. Assertion (A): In electron beam welding process, vacuum is an essential process parameter.
     Reason (R): Vacuum provides a highly efficient shield on weld zone.

1. 1. Both A and R are true and R is the correct explanation of A

   
   
   

   2. Both A and R are true but R is not a correct explanation of A

   
   
   

   3. A is true but R is false

   
   
   

   4. A is false but R is true

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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