heating and welding MCQs – Page 3

Practise focused heating and welding questions with marked answers for exam preparation and subject revision.

heating and welding Mcqs
41. For intermittent work which of the following furnaces is suitable ?
comments icon0
A. Either of the above

B. None of the above

C. Core less furnace

D. Indirect arc furnace

42. Induction heating process is based on which of the following principles ?
comments icon0

A. Nucleate heating principle

B. Electro-magnetic induction principle

C. Thermal ion release principle

D. Resistance heating principle

43. Induction heating takes place it which of the following ?
comments icon0

A. Conducting materials which are magnetic

B. Conducting materials which are non-magnetic

C. Conducting materials which may or may not be magnetic

D. Insulating materials

44. The electrode of a direct arc furnace is made of____________?
comments icon0
A. graphite

B. copper

C. tungsten

D. silver

45. Radiations from a black body are proportional to____________?
comments icon0

A. T2

B. T1

C. T*

D. T3

46. Heat transfer by condition will not occur when____________?
comments icon0
A. temperatures of the two bodies are identical

B. bodies are kept in vacuum

C. bodies are exposed to thermal radiations

D. bodies are immersed in water

47. In arc furnace the function of choke is______________?
comments icon0

A. to imprpve, power factor

B. none of the above

C. to reduce severity of the surge

D. to stabilize the arc
48. method has leading power factor____________?
comments icon0
A. Dielectric heating

B. Arc heating

C. Induction heating

D. Resistance heating

49. Due to which of the following reasons it is desirable to have short arc length ?
comments icon0

A. To increase the life of roof refractory

B. To have better stirring action

C. To achieve better heating

D. All of the above

E. To reduce problem of oxidation

50. Which of the following insulating materials was suitable for low temperature applications ?
comments icon0

A. Cork

B. Diatomaceous earth

C. Asbestos paper

D. 80 percent magnesia