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4

In practice, the compression ratio of compression-ignition (CI) engine ranges from

A. 15 to 25

B. 5 to 10

C. 40 to 55

D. 60 to 70

Correct Answer :

A. 15 to 25


Related Questions

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4

Viscoelastic behaviour is observed in __________ materials.

A. Non-crystalline organic polymeric

B. Ceramic

C. All crystalline

D. All amorphous

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4

Thermal conductivity of a material does not depend upon its

A. Mass

B. Volume

C. Surface area

D. All 'a', 'b' & 'c'

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4

Which of the following commonly used condenser tube materials has the lowest thermal conductivity?

A. Admiralty brass

B. Stainless steel

C. Aluminium brass

D. Titanium

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4

Sudden fall of atmospheric pressure by a large amount is an indication of the

A. Rain

B. Cold wave

C. Storm

D. Fair weather

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4

In a furnace with heating element temperature at 1700°C, the dominant mechanism of heat transfer will be

A. Conduction

B. Radiation

C. Natural convection

D. Forced convection

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4

The cathode in an electrochemical cell always carries

A. Negative charge

B. Positive charge

C. Zero charge

D. Positive or negative charge depending upon the nature of the cell

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4

Materials having __________ lattice structure are usually the most ductile.

A. Body centred cubic (bcc)

B. Hexagonal close packed (hcp)

C. Face centred cubic (fcc)

D. None of these

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4

Titanium is produced by __________ of Ti Cl4.

A. Electrolytic reduction

B. Calcium reduction

C. Magnesium reduction

D. Thermal dissociation

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4

Electrostatic separation of minerals from each other is based on their differences in the following property.

A. Densities

B. Magnetic permeabilities

C. Electrical conductivities

D. Hardness

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4

Coating provided on the electrodes used in the arc welding is not expected to

A. Add alloying elements

B. Prevent electrode from contamination

C. Stabilise the arc

D. Provide protective atmosphere to weld

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4

Plants produce carbohydrates from the CO2 present in the atmosphere by

A. Polymerisation

B. Photochemical reaction

C. Oxidation

D. None of these

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4

The underground well of a biogas plant is called the

A. Septic tank

B. Oxidation well

C. Digestor

D. Lagoon

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4

Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?

A. Anodising

B. Tempering

C. Carburising

D. Annealing

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4

Young's modulus of a material is the measure of its

A. Stiffness

B. Malleability

C. Creep resistance

D. Tensile strength

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4

Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50% B is

A. R ln 2

B. -R ln 2

C. 3 R ln 2

D. -3R ln 2

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4

Pick out the wrong statement.

A. Weldability of high carbon steel is poorer compared to low carbon steel

B. Invar is a magnetic alloy

C. Magnetic permeability of the diamagnetic material is less than one

D. Martenistic transformation never goes to completion (i.e., 100%) at room temperature

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4

Exposure to __________ accelerates the degradation of plastics.

A. Ultraviolet radiation

B. High atmospheric temperature

C. High ambient temperature

D. Damp atmosphere

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4

Bad odour in sanitary latrines is reduced by periodically sprinkling

A. Bleaching powder

B. Lime powder

C. Aluminium sulphate

D. None of these

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4

The life of a ball bearing is inversely proportional to

A. (Load)1

B. (Load)2

C. (Load)3

D. (Load)0.33

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4

Primary designation of steel is based on its

A. Hardness & tensile strength

B. Carbon content

C. Iron content

D. Alloying elements content

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4

Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area; in the casting)

A. V/A

B. V/A2

C. V2/A

D. V2/A2

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4

The two elements required to form substitutional solid solution should not have

A. Same crystalline structure

B. Same valency

C. Widely differing electronegativity

D. Same atomic sizes

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4

Silicon percentage in acid resistant cast iron is about

A. 4

B. 8

C. 14

D. 20

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4

Leakage in a cooking gas cylinder is detected by

A. Radio-isotopes

B. Pouring soap solution on the surface and locating the gas bubbles

C. Halide torch

D. Pungent smell of mercaptans present in the gas

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4

The minimum and the maximum number of members required to form a Private Limited Joint Stock Company are respectively

A. 7 and 30

B. 10 and 50

C. 2 and 50

D. 13 and 55

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4

Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per of steel strip.

A. 5-10

B. 1000-1500

C. 120-500

D. 1500-3000

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4

Laser is a device to produce

A. Gamma rays

B. Microwaves

C. A beam of white light

D. A beam of coherent light

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4

A common disinfectant used in village wells for disinfection of water is

A. Free chlorine

B. Bromine

C. Iodine

D. Potassium permanganate

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4

Most of the phosphorous present in the blast furnace burden enters into

A. Hot metal

B. Flue gases

C. Slag

D. Refractory lining

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4

Recrystallisation temperature of steel is __________ °C.

A. 50

B. 300

C. 500

D. 800