1. Choose the best device to hold and locate a round bar drilling ?

pin locator

wedge type locator

v-block

adjustable locator

Answer: v-block

Explanation:


2. Which one of the following metals does not require any coolant during reaming ?

Cast iron

aluminium

mild steel

copper

Answer: Cast iron

Explanation:


3. Drill socket is used when the taper shank of the drill is ?

smaller than the machine spindle

larger than the machine spindle

equal to the machine spindle

none of the above

Answer: larger than the machine spindle

Explanation:


4. The reamer teeth and spacing are designed to assist in reaming more accurate holes with good surface finish. Which one of the following is true regarding the number of teeth and their spacing ?

uneven number of teeth and uneven spacing

uneven number of teeth and even spacing

even number of teeth and uneven spacing

even number of teeth and even spacing

Answer: even number of teeth and uneven spacing

Explanation:


5. The included angle of the counter sinking portion of a centre drill of type B used for protecting the centre holes is _________ ?

75°

90°

100°

120°

Answer: 120°

Explanation:


6. Boring is done to ?

make surface flat so that the bolt head can take proper seat on the surface

given fine finish to the drilled hole

enlarge the existing hole

produce thread on the hole

Answer: enlarge the existing hole

Explanation:


7. A hole is to be made on mild steel with a 12 mm diameter reamer. If the under size is 0.3 mm and if the over size 0.05 mm, What will be the diameter of the drill for drilling the hole before reaming ?

12.35 mm

10.65 mm

11.65 mm

11.05 mm

Answer: 11.65 mm

Explanation:


8. The process of bevelling the end of existing hole is called ?

spot facing

boring

counter-boring

counter-sinking

Answer: counter-sinking

Explanation:


9. The reamer is a ?

single point cutting tool

multi-point cutting tool

saw tooth cutting tool

parting tool

Answer: multi-point cutting tool

Explanation:


10. Lip angle or angle of cutting edge of twist drill is ?

181°

128°

108°

118°

Answer: 118°

Explanation: