Home
Current Affairs January 2024

What is the correct answer?

4

According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress.

A. 0.5

B. 2

C. √2

D. √3/2

Correct Answer :

A. 0.5


Related Questions

What is the correct answer?

4

The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is

A. More

B. Less

C. Same

D. More but less than the diameter of bolt

What is the correct answer?

4

Angular displacement can be measured suitably by a

A. Shaft encoder

B. Linear variable differential transducer (LVDT)

C. Stroboscope

D. Tachometer

What is the correct answer?

4

What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.

A. 2

B. 8

C. 10

D. 40

What is the correct answer?

4

Material of construction of the electrode used in the electric resistance welding is

A. Stainless steel

B. Graphite

C. Copper

D. Steel

What is the correct answer?

4

With increase in temperature, the electrical conductivity of semiconductors

A. Increases

B. Decreases

C. Remain constant

D. Either (A) or (B), depends on the type of semi-conductor

What is the correct answer?

4

A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons.

A. Lack of free

B. Excess of

C. Decrease in

D. None of these

What is the correct answer?

4

Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than

A. 5

B. 10

C. 20

D. 35

What is the correct answer?

4

A jet engine turbine blade is normally manufactured by

A. Forging

B. Shell moulding

C. Investment casting

D. Pressure die casting

What is the correct answer?

4

In the Bayer's process, bauxite is digested under pressure using

A. H2SO4

B. NaOH

C. NH3

D. HCl

What is the correct answer?

4

In the acid Bessemer process, the hot metal should have the following composition.

A. S < 0.05% and P < 0.05%

B. S < 0.05% and P < 1.5%

C. S < 0.05% and P > 1.5%

D. S > 1.5% and P < 0.05%

What is the correct answer?

4

Cascade control is

A. The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller

B. Used when changes in process conditions cause serious upsets in the controlled variable

C. Useful to control flow from temperature

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

What is the correct answer?

4

Colour comparator is used to measure the

A. pH value

B. Electrode potential

C. Colour intensity

D. None of these

What is the correct answer?

4

Evaporative cooling process employs a combination of cooling and humidification in which the

A. Sensible heat is added

B. Sensible heat is removed and the latent heat is added

C. Latent heat is removed

D. Sensible heat is added and latent heat is removed

What is the correct answer?

4

A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec2 is

A. 8.82

B. 9.81

C. 10.88

D. 0.95

What is the correct answer?

4

Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are:

A. Nickel, cobalt & chromium

B. Tungsten, chromium & cobalt

C. Manganese, chromium & cobalt

D. Tungsten, molybdenum & nickel

What is the correct answer?

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

What is the correct answer?

4

The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.

A. Tension

B. Shear

C. Compression

D. Bending & tension

What is the correct answer?

4

__________ stress cannot be sustained by a fluid in equilibrium.

A. Shear

B. Tensile

C. Compressive

D. None of these

What is the correct answer?

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

What is the correct answer?

4

Which of the following materials has the least scrap value?

A. Aluminium

B. Stainless steel

C. Brass

D. Copper

What is the correct answer?

4

Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?

A. Output & fineness

B. Velocity

C. Both (A) & (B)

D. None of these

What is the correct answer?

4

The thickness of oxide film is y at time t. If are the temperature dependent constants, the parabolic law of oxidation is given by

A.

B.

C.

D.

What is the correct answer?

4

More than 95% of __________ is present in corundum.

A. SiO2

B. Al2O3

C. CaSiO2

D. MgO

What is the correct answer?

4

The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?

A. 159

B. 1837

C. 2537

D. 10000

What is the correct answer?

4

Laser welding is widely employed in the __________ industries.

A. Electronic

B. Structural

C. Process

D. Heavy

What is the correct answer?

4

Reduction in the grain size reduces the __________ of the material.

A. Fatigue resistance

B. Tensile strength

C. Creep resistance

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

What is the correct answer?

4

Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is

A. Black

B. Silver grey

C. Green

D. Yellow

What is the correct answer?

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

What is the correct answer?

4

Hydro-cyclone is a

A. Crusher

B. wet classifier

C. Dry classifier

D. Magnetic separator

What is the correct answer?

4

Which of the following fastening devices has a head at one end and a nut fitted to the other?

A. Bolt

B. Stud

C. Top bolt

D. None of these