1. . Machining time is represented by
(A) td
(B) tm
(C) ta
(D) ts
2. . ts represents
(A) machining time
(B) delay time
(C) auxiliary time
(D) set up time
3. . Normally, this material can be machined without coolant.
(A) brass
(B) tool steel
(C) mild steel
(D) cast iron
4. . It minimizes friction between tool and workpiece during machining.
(A) coolant
(B) lubricant
(C) air
(D) both b&c
5. . It reduces wear and heat between the mating parts of a machine.
(A) coolant
(B) lubricant
(C) air
(D) both a&c
6. . It is a best cutting oil but very expensive.
(A) soluble oil
(B) mobil oil
(C) crude oil
(D) lord oil
7. . Fixed oil is composed of.
(A) animal oil
(B) fish oil
(C) vegetable oil
(D) all of above
8. . Soluble oils are known as
(A) enamels
(B) emulsions
(C) crude oil
(D) none of above
9. . For ferrous metals of medium hardness, the oil to water ratio for making water soluble cutting oil is.
(A) 1:10
(B) 1:20
(C) 1:20
(D) 1:40
10. . For medium grinding operations, the oil to water ratio for making water soluble cutting oil is.
(A) 1:10
(B) 1:20
(C) 1:20
(D) 1:40
11. . In threading, oil is used
(A) pure mineral oil
(B) animal oil
(C) mineral oil & additives
(D) both a&b
12. . The expression for actual machining time is given by tm =
(A) L/(F×N)
(B) L(F×N)
(C) L/(F+N)
(D) (L×F)/N
13. . The time spent in personal needs of the worker.
(A) machining time
(B) delay time
(C) set up time
(D) auxiliary time
14. . Graphite powder is a
(A) metal
(B) coolant
(C) alloy
(D) lubricant
15. . Function of coolant is to
(A) reduce friction
(B) cool the tool & job
(C) improve surface finish
(D) all of above