Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines?

By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. The saving in case of a double acting reciprocating pump is

A

39.2%

B

48.8%

C

84.8%

D

88.4%

By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is

A

39.2%

B

48.8%

C

84.8%

D

88.4%

For hardening alloy steels and high speed steels, they are heated to

A

1100 to 1300°C

B

1300 to 1500°C

C

500 to 600°C

D

700 to 900°C

Which of the following alloy steels is the most suitable for making gun barrels and projectiles?

A

Tungsten steel

B

Molybdenum steel

C

Nickel-chrome steel

D

Cobalt steel

Zinat's father contributes to his daughter's saving by giving he 10% of her total saving. If zinat saves Tk. 100 in june , Tk. 250 in july and TK. 130 in August , how much will she have in savings in tk. at the end of that time. ?

A

528

B

524

C

539

D

480

A saving account earns 4%. If the saver is in a 28% tax bracker. The after tax rate of return on saving would be___percent.

A

28.0

B

16.72

C

2.88

'Killed steels' are those steels

A

Which are destroyed by burning

B

Which after their destruction are recycled to produce fresh steel

C

Which are deoxidized in the ladle with silicon and aluminium

D

In which carbon is completely burnt

Steels with high carbon equivalent have poor weldability, because in these steels during welding

A

Carbon and other alloying elements get oxidised from the weld pool

B

Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld

C

Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld

D

Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld

Ferric stainless steels compared to austenitic stainless steels

A

Have lower corrosion resistance

B

Are harder to fabricate

C

Are less ductile and hence less suitable for cold pressing

D

All of the above

The alloy used for making electrical resistances and heating elements is

A

Nichrome

B

Invar

C

Magnin

D

Elinvar

Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines?

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