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Current Affairs January 2024

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4

Spark plug is provided in a/an

A. Engine having carburettor

B. Diesel engine

C. Compression ignition engine

D. Both (B) & (C)

Correct Answer :

A. Engine having carburettor


Related Questions

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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

Multistage compression of air as compared to single stage compression offers the advantage of

A. Power saving per unit weight of air delivered

B. Moisture elimination in the inter-stage cooler

C. Increased volumetric efficiency

D. All (A), (B) & (C)

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4

Heating of ferromagnetic materials to a temperature above Curie temperature makes it

A. Insulator for heat & electricity transmission

B. Ferritic

C. Behave like paramagnetic materials

D. Superconductor

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4

Preheating before welding is done to

A. Make the plate softer

B. Burn oil & grease sticking to plate surfaces

C. Avoid plate distortion

D. Prevent cold cracks

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4

Ferromagnetic materials owe their properties to __________ inner sub-shells.

A. Completely filled

B. Partially filled

C. Equally filled

D. Vacant

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4

Increasing sulphur content in pig iron tends to make it

A. Soft

B. Hard

C. Tough

D. Ductile & malleable

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4

Alloys having more than 80% copper are generally more

A. Abrasion resistant

B. Corrosion resistant

C. Prone to season cracking

D. Machinable

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4

Which of the following is not an explosive?

A. TNT

B. CMC

C. RDX

D. Lead azide

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4

Joining of thin foils is preferred to be done by

A. Gamma rays

B. X-rays

C. Microwaves

D. Gas welding

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4

Load cells used for the measurement of weight has

A. Compact & rugged construction with an accuracy of 0.1 to 1%

B. No moving parts and incurs negligible deflection under load

C. Provision of thermal compensation and is hermetically sealed

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

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4

Which of the following metals is the most prone to work hardening?

A. Brass

B. Aluminium

C. Copper

D. Lead

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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

Hooke's law

A. Applies to elastic deformation

B. Applies beyond limit of proportionality in stress-strain curve

C. States that stress is inversely proportional to strain upto elastic limit

D. None of these

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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

Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.
A. Induced draft fan
B. Economiser
C. Air preheater
D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories?

A. A, C, B, D

B. D, B, C, A

C. D, C, B, A

D. D, A, B, C

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4

Normalising of an object does not

A. Refine coarse grain structure obtained during hot working

B. Improve ductility

C. Improve yield strength

D. Improve mechanical properties

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4

A dummy activity is used in PERT network to describe the

A. Precedence relationship

B. Resource idleness

C. Resource restriction

D. Necessary time delay

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4

In chemical dehumidification of air

A. Both specific humidity & dry bulb temperature increases

B. Both specific humidity & dry bulb temperature decreases

C. Specific humidity decreases & dry bulb temperature increases

D. Specific humidity increases & dry bulb temperature decreases

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4

Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.

A. 10

B. 20

C. 30

D. 40

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4

Silicon in steel

A. Makes it usable in almost all magnetic circuits where alternating current is used

B. Increases its electrical resistivity and decreases the hysteresis loss

C. Is present upto 5% & 4% respectively when used in transformers & motor armatures

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

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4

When an isolated thermodynamic system executes a process,

A. Work is done

B. Heat transfer takes place

C. Mass flow occurs across the boundary of the system

D. No chemical reaction takes place within the system

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4

At 100% relative humidity, the dew point temperature of moist air is

A. Less than the wet bulb temperature

B. More than the wet bulb temperature

C. Equal to the wet bulb temperature

D. Equal to the ambient temperature

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4

The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.

A. Casting

B. Pattern

C. Draft

D. Distortion

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4

Out of the following __________ iron has the best capability to bear sudden & excessive shocks.

A. White

B. Cast

C. Wrought

D. Pig

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4

In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be

A. Higher, as it gives higher wavelength

B. Lower, as it gives higher wavelength

C. Higher, as it gives shorter wavelength

D. Lower, as it gives shorter wavelength

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4

Atomic __________ is a whole number for an element.

A. Number

B. Weight

C. Radius

D. None of these

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4

A high pressure boiler generates steam at a pressure greater than __________ kg/cm2.

A. 10

B. 30

C. 50

D. 80

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4

The thermodynamic law, = constant, is not followed by the

A. Free expansion of an ideal gas

B. Adiabatic expansion of steam in turbine

C. Adiabatic compression of air

D. Ideal compression of air

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4

Pick out the wrong statement.

A. Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties

B. Low carbon steel does not respond to the heat treatment for hardening of the material, hence it is subjected to case hardening or surface hardening processes like cyaniding, carburising, nitriding etc., which produces high carbon outer layers resulting in increase of surface hardness

C. Induction hardening and flame hardening techniques are also used for surface hardening

D. Martempering of a material is a hardening process

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4

Direct conversion of thermal energy to electrical energy is facilitated by the

A. Fuel cells

B. Photo voltaic cell

C. Magneto hydrodynamic generator

D. None of these