BOE'17 (96-200 Q)

The scalar ($) lamda is a characteristic root of the matrix A if (A) (A~ Al) is non-singular d (A - AI) is singular (C) A is non-singular (D) A is singular

• (A~ $l) is non-singular

• (A~ $l) is singular

• A is non-singular

• A is singular

The solution of the initial value problem y"+y'-2y=0, given y(0)=3, y'(0)=0 is

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Choose the mismatch of the following

• (A) Oildag — Internal combustion epginés

• (B) Molybdenum disulphide _ sandwich structure

• (C) Hydrocarbon oils — watches

• (D) Glycerides of fatty acids — sewing machines

The calorific value of brown coals lie in the range of

• (A) 8000~8500 Kcal/kg

• (B) 8500~8600 Kcal/kg

• (C) 8650 — 8700 Kcal/kg

• 6500 - 7000 Kcal/kg

Which among the following can withstand upto 2500°C?

• (A) High alumina

• (B) Dolomite

• (C) Chromite

• (D) Zirconia

Which one of these following is formed (as a green film) when copper is exposed to moist air containing CO2?

• (A) CuCO3+ Cu(OH)2

• (B) Cu,CO2 + Cu(OH)

• (C) CuCo2 +Cu(OH)

• (D) CuS0, +Cu(OH)

What is the gross calorific value of 1 kg of carbon? Given that, fig 1 + Delta (H)= -394kJ/mol. Atomic weight of carbon is 12.

• (A) 7,847 kcal/kg

• (B) 3,200 kcal/kg

• (C) 3,940 kcal/kg

• (D) 12,000 kcal/kg

Ground water acquires calcium and magnesium bicarbonate hardness because of

• (A) the dissolution of calcium and magnesium carbonates in water containing dissolved co2

• (B) the hydrolysis of CaSO4 and MgSO4 with water containing dissolved CO2

• (C) the hydrolysis of CaCO3 and MgCO3 by water containing dissolved O2

• (D) the reaction of calcium and magnesium silicates with water containing dissolved CO2

Which of the following is not a primary explosive?

• (A) Mercury fulminate

• (B) Tetracene

• (C) Leadazide

• (D) TNT

Corundum is made up of

• (A) sio2

• (B) sic

• B4C

• Al2O3