141. Match the following
     Group I
     1. Blunting of grinding wheels
     2. Shaping of grinding wheels
     3. Sharpening of grinding wheels
     4. Clogging of grinding wheels
     Group II
     P. Dressing
     Q. Loading
     R. Glazing
     S. Trueing

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

   
   
   

   2. P Q R S
      3 1 4 2
      

   
   
   

   3. P Q R S
      3 4 1 2
      

   
   
   

   4. P Q R S
      4 3 1 2

   
   
   

---

1. View Hint View Answer Discuss in Forum

   P–3 Q–1 R–4 S–2

   Correct Option: C

   P–3 Q–1 R–4 S–2

---

142. In whitworth quick return mechanism (used in shapers) the velocity of the ram is maximum at

1. 1. middle of the forward stroke

   
   
   

   2. beginning of return stroke

   
   
   

   3. end of return stroke

   
   
   

   4. middle of the return stroke

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

---

143. Reamers have usually even number of teeth so that the cutting forces on teeth are properly balanced. (T/F)
     

1. 1. True

   
   
   

   2. False

   
   
   

   3. NA

   
   
   

   4. NA

   
   
   

---

1. View Hint View Answer Discuss in Forum

   True

   Correct Option: A

   True

---

144. Machinability of steels is improved by the addition of

1. 1. Sulphur

   
   
   

   2. Silicon

   
   
   

   3. Phosphorous

   
   
   

   4. All of the above

   
   
   

   5. A and C both

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: E

   NA

---

---

145. Assertion (A): Grinding needs higher specific cutting energy than milling. Reason
     (R): Milling cutter material is harder than abrasive grains.

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

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---