1. What is the percentage of carbon tungsten in T-series of high speed steel?
a) 20
b) 18
c) 16
d) 14
Explanation: 18% of tungsten is present in T-series of high speed steel. It is used for cutting at low speeds rather than at high speed as its name implies but it cuts faster.
2.What is the percentage of carbon chromium in T-series of high speed steel?
a) 0
b) 8
c) 6
d) 4
Explanation: 4% of chromium is present in T-series of high speed steel. It is used for cutting at low speeds rather than at high speed as its name implies but it cuts faster.
3. What is the percentage of vanadium in T-series of high speed steel?
a) 2
b) 1
c) 6
d) 4
Explanation: 1% of vanadium is present in T-series of high speed steel. It is used for cutting at low speeds rather than at high speed as its name implies but it cuts faster.
4. What is the percentage of Molybdenum in M-series of high speed steel?
a) 12
b) 21
c) 16
d) 24
Explanation: 21% of molybdenum is present in M-series of high speed steel. It is used for cutting at low speeds rather than at high speed as its name implies but it cuts faster.
5. M-series high speed steel has more efficiency than T-series high speed steel.
a) True
b) False
Explanation: M series have more cutting efficiency than T series high speed steel. It is used for cutting at low speeds rather than at high speed as its name implies but it cuts faster.
6. Presence of Chromium in T-series steel imparts
a) Hardness
b) Corrosion resistance
c) Abrasion resistance
d) Toughness
Explanation: Chromium imparts corrosion and oxidation resistance to a material. It is used for cutting at low speeds rather than at high speed as its name implies but it cuts faster.
7. Which of the following element is responsible for providing red hot hardness property to T-series high speed steel?
a) W
b) Cr
c) V
d) Mo
Explanation: Tungsten imparts red hot hardness i.e. property to impart hardness at high temperature. HSS is used for cutting at low speeds rather than at high speed as its name implies but it cuts faster.
8. If percentage of cobalt in Tungsten carbide tool increases, then the strength of the tool will
a) Increase
b) Decrease
c) Remains Constant
d) First increase then decrease
Explanation: With an increase in the percentage of cobalt hardness decreases. HSS is used for cutting at low speeds rather than at high speed as its name implies but it cuts faster.
9. If percentage of cobalt in Tungsten carbide tool increases, then hardness of tool will
a) Increase
b) Decrease
c) Remains Constant
d) First increase then decrease
Explanation: With an increase in the percentage of cobalt, hardness and strength decreases.
10. If percentages of cobalt in Tungsten carbide tool increases, then wear resistance of tool will
a) Increase
b) Decrease
c) Remains Constant
d) First increase then decrease
Explanation: With increase in the percentage of cobalt hardness, strength and wear resistance decreases.