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Current Affairs January 2024

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4

Ammonia leakage in the refrigeration system is detected by

A. Sulphur stick, which on detection gives white smoke

B. Using chemical reagents

C. Its smell

D. Soap solution

Correct Answer :

A. Sulphur stick, which on detection gives white smoke


Related Questions

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Cold heading or upsetting is categorised as the __________ process.

A. Extrusion

B. Bending

C. Rolling

D. Forging

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4

One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W. m- 1. k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is

A. 100

B. 900

C. 9000

D. 10000

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4

The escape velocity of a body on earth which is independent of its mass is about __________ km/second.

A. 3

B. 7

C. 11

D. 15

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4

Cast iron contains __________ percent carbon.

A. 2.5

B. 3.75

C. 4.75

D. 5.25

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4

The refractory lining of the bottom in a basic electric arc furnace is made of

A. Silica

B. Alumina

C. Magnesia

D. Fireclay

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4

The main reducing agent in iron blast furnace is

A. Carbon dioxide

B. Carbon monoxide

C. Oxygen

D. Air

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4

Gas turbine normally employs a constant __________ cycle.

A. Pressure

B. Temperature

C. Volume

D. None of these

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4

Lap joints are preferred over butt joints in soldering/brazing, because these joints are

A. Weaker in tension but stronger in shear

B. Weaker in shear but stronger in tension

C. Stronger in both shear and tension

D. The lap joints are easily made

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4

A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?

A. Steel

B. Glass

C. Rubber

D. Brass

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4

Natural water contains approximately __________ percent of heavy water.

A. 0.015

B. 0.71

C. 1.2

D. 3.5

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4

The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.

A. 60 - 100

B. 400 - 700

C. 1200 -1500

D. 2000 - 2300

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4

Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of

A. Steel

B. Glass wood

C. Copper

D. Fireclay bricks

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4

Recrystallisation temperature of steel is __________ °C.

A. 50

B. 300

C. 500

D. 800

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4

In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is

A. Less

B. More

C. Equal

D. Unpredictable

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4

__________ are normally subjected to sub-zero treatment.

A. Highly stressed parts

B. Gauges or precision parts

C. Cold rolled sheets

D. Non machinable materials

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4

Pick out the correct combination about the role of various additives used in polymers.

A. Plasticiser: increases the polymer strength

B. Heat stabiliser: increases the maximum service temperature

C. Fillers: Does not affect the property of polymer but increases its weight

D. Lubricants: increases the flexibility of polymers

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4

Which of the following is a commonly used manometric liquid for low pressure range?

A. Ethyl alcohol

B. Carbon tetrachloride

C. Glycerol

D. Ethylene glycol

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4

Pearlite comprises of

A. 87% cementite & 13% Fe

B. 87% ferrite & 13% cementite

C. 93.33% ferrite & 6.67% C

D. 87% ferrite & 13% C

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4

Cold chisels hammers are made of

A. High speed steel

B. High carbon steel

C. Forged steel

D. Mild steel

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4

Out of the following, the alloy which has equal percentage of constituents, is

A. White metal

B. Gun metal

C. Duralumin

D. Constantan

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4

The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by

A. T1/(T1-T2)

B. T2/(T1-T2)

C. T1/T2

D. T2/T1

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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

Which of the following terminology is used for the temperature at which new grains are formed in a metal?

A. Eutectic temperature

B. Lower critical temperature

C. Recrystallisation temperature

D. Upper critical temperature

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4

Silicon crystal can be converted to p-type semiconductor by doping with

A. Phosphorous

B. Nitrogen

C. Carbon

D. Boron

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4

__________ is not used as a material of construction in thermocouples.

A. Alumel

B. Rhodium

C. Constantan

D. Duralumin

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4

Hot working of lead is carried out at

A. 75°C

B. 373°K

C. 150°C

D. Room temperature

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4

Diamagnetic materials

A. Are magnetised by eddy currents only

B. Are non-magnetic and cannot be magnetised

C. Are magnetised in direction opposite to the magnetic field

D. Can be magnetised in one direction only

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4

Which of the following fastening devices has its both ends threaded?

A. Bolt

B. Stud

C. Set screw

D. Split nut

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4

The stress at which extension of the material takes place more rapidly as compared to the increase in load is termed as the __________ point of the material.

A. Elastic

B. Ultimate

C. Yielding

D. Breaking

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4

In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of

A. Stainless steel

B. Mild steel

C. High speed steel

D. High carbon steel