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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 94251. |
“The direction of an induced e.m.f. is always such that it tends to set up a current opposing the motion or the change of flux responsible for inducing that e.m.f.”, this is the statement for?(a) Fleming’s left hand rule(b) Fleming’s right hand rule(c) Faraday’s law(d) Lenz’s law |
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Answer» Correct option is (d) Lenz’s law Explanation: The above statement is that of Lenz’s law. It is used to determine the direction of the induced emf. |
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| 94252. |
Which IS Code gives a classification of commercial timbers and their zonal distribution?(a) IS 620(b) IS 399(c) IS 401(d) IS 190 |
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Answer» The correct option is (b) IS 399 To elaborate: IS 620 gives details about wooden tools handles. IS 401 specifies about the preservation of timber and IS 190 about coniferous sawn timber. |
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| 94253. |
Find the strength of the magnetic field in a conductor 0.5m long moving with a velocity of 10m/s, inducing an emf of 20V if magnetic field, velocity and length of conductor are mutually perpendicular to each other.(a) 1T(b) 2T(c) 3T(d) 4T |
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Answer» Right option is (d) 4T Easiest explanation: The formula for induced emf is: emf=Blv if B, l, v are perpendicular to each other. Substituting the values of l, emf and v from the question, we get B=4T. |
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| 94254. |
What does grade 33 cement indicate?(a) Tensile strength of 33 kN/m^2(b) Tensile strength of 33 N/mm^2(c) Compressive strength of 33 kN/m^2(d) Compressive strength of 33 N/mm^2 |
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Answer» The correct option is (d) Compressive strength of 33 N/mm^2 To explain: The grades of cement are specified by IS 1489-1991. Cements are usually graded based on their compressive strength. |
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| 94255. |
I1 is the current flowing in the first mesh. I2 is the current flowing in the second mesh and I3 is the current flowing in the top mesh. If all three currents are flowing in the clockwise direction, find the value of I1, I2 and I3.(a) 7.67A, 10.67A, 2A(b) 10.67A, 7.67A, 2A(c) 7.67A, 8.67A, 2A(d) 3.67A, 6.67A, 2A |
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Answer» The correct option is (a) 7.67A, 10.67A, 2A To explain: The two meshes which contain the 3A current is a super mesh. The three mesh equations therefore are: I3=2A I2-I1=3 -2I1-I2=-26 Solving these equations simultaneously we get: I1=7.67A, I2=10.67A and I3=2A. |
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| 94256. |
Find the value of v if v1=20V and value of current source is 6A.(a) 10V(b) 12V(c) 14V(d) 16V |
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Answer» The correct choice is (b) 12V The best explanation: The current through the 10 ohm resistor=v1/10=2A.Applying KCL at node 1: i5=i10+i2. i2=6-2=4A. Thus the drop in the 2 ohm resistor = 4×2 = 8V. v1=20V; hence v2=20-v across 2 ohm resistor=20-8=12V v2=v since they are connected in parallel. v=12V. |
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| 94257. |
Materials having resistance almost equal to zero is _______(a) Semi-conductor(b) Conductor(c) Superconductors(d) Insulators |
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Answer» The correct choice is (c) Superconductors For explanation I would say: When the temperature of the material falls to absolute zero, the resistance falls to zero and hence there are no I^2R losses. Since resistance is zero, conductance is almost infinity and hence these materials are known as superconductors. |
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| 94258. |
Which of the following materials are not used for making chills?(a) Steel(b) Cast iron(c) Copper(d) Zinc |
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Answer» The correct option is (d) Zinc Easy explanation: For making chills, steel, cast iron and copper is widely used. But zinc metal is not used for this. Copper is used even more for chilling, as it provides the highest conductivity. |
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| 94259. |
Which pair of the compound and coloured cement mentioned below is wrong?(a) Iron oxide-yellow(b) Cobalt-black(c) Chromium oxide-green(d) Manganese dioxide-brown |
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Answer» Correct option is (b) Cobalt-black To explain: Cobalt imparts blue colour to cement. Iron oxide in different proportion imparts brown, red and yellow colour. Manganese dioxide produces brown and black coloured cement. |
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| 94260. |
The voltage across the short is?(a) 135V(b) Infinity(c) Zero(d) 11.25V |
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Answer» Correct choice is (c) Zero Explanation: The voltage across a short is always equal to zero whether it is connected in series or parallel. |
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| 94261. |
KCL deals with the conservation of?(a) Momentum(b) Mass(c) Potential Energy(d) Charge |
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Answer» The correct option is (d) Charge Easy explanation: KCL states that the amount of charge entering a junction is equal to the amount of charge leaving it, hence it is the conservation of charge. |
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| 94262. |
What property does air-entraining cement provide?(a) Workability(b) Soundness(c) Fineness(d) Strength |
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Answer» Right option is (a) Workability Easiest explanation: Air-entraining agents are added to cement during manufacturing. These create voids and in turn increases workability when used in concrete. |
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| 94263. |
Which metal in aluminium alloy reacts with water to give out hydrogen filled pinholes?(a) Manganese(b) Iron(c) Magnesium(d) Aluminium |
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Answer» Correct answer is (c) Magnesium The explanation is: Magnesium which is present in small quantity inside the light alloy, when reacts with water, causes the formation of hydrogen filled pinholes. |
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| 94264. |
Calculate the equivalent resistance between A and B.(a) 60 ohm(b) 15 ohm(c) 12 ohm(d) 48 ohm |
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Answer» Right option is (c) 12 ohm Easiest explanation: 5 ohm and 15 ohm are connected in series to give 20 ohm.10ohm and 20 ohm are connected in series to give 30 ohm. Now both equivalent resistances (20ohm and 30 ohm) are in parallel to give equivalent resistance 20*30/(20+30) = 12 ohm. |
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| 94265. |
KCL can be applied for __________(a) Planar networks(b) Non-planar networks(c) Both planar and non-planar(d) Neither planar nor non-planar |
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Answer» Correct option is (c) Both planar and non-planar For explanation I would say: KCL is applied for different nodes of a network whether it is planar or non-planar. |
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| 94266. |
If side length of square changing with time `0.002 m//s` then what will be rate fo change of Area of square when side length become 5m.A. `0.05 m^(2)//s`B. `0.02 m^(2)//sec`C. `0.01 m^(2)//sec`D. `0.03m^(2)//sec` |
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Answer» Correct Answer - B `A=l^(2)` `(dA)/(dt)=2l((dl)/(dt))=2(5)(2xx10^(-3))=2xx10^(-2)m^(2)//sec` `(dA)/(dt)=0.02 m^(2)//sec` |
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| 94267. |
What is the current in the circuit?(a) 0A(b) 15A(c) 5A(d) 10A |
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Answer» The correct answer is (a) 0A The explanation is: If we move in the clockwise direction, we get the total voltage to be equal to: -10-20+30 = 0V. Since I=V/R = 0/4=0, I=0A. |
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| 94268. |
ComprehensionQ1-10. Read the passage given below and then answer the questions given below the passage. Some words may be highlighted for your attention. Pay careful attention. Pakistani officials have threatened to use nuclear weapons should India invade, after India’s new army chief admitted to clandestine military plans for attacking its neighbour in the event of a crisis.Three officials in Islamabad have revealed that Pakistan would take all necessary measures to defend itself should India ever put into action long-rumoured “cold-start” plans to attack Pakistani territory following an event such as a major terrorist incident. “If ever our national security is threatened by advancing foreign forces, Pakistan will use all of its weapons — and I mean all of our weapons — to defend our country,” one of the officials said. The comments come two weeks after Bipin Rawat, the newly appointed head of the Indian army, acknowledged the existence of “cold start”.The cold-start strategy is designed to enable an instant response to crisis including attacks by militants launched from Pakistani soil, and would mean Indian troops entering Pakistan and occupying positions along the border before Islamabad could prepare or the international community could intervene. The arms build-up in the region has raised the nuclear stakes.According to a 2010 diplomatic cable from the then US ambassador in New Delhi released by WikiLeaks, the plan is designed to enable a rapid response to a crisis without threatening the survival of the Pakistani state — or triggering a nuclear response. Tensions between the two nuclear-armed neighbours have remained high since last September’s attack on the Indian army base at Uri in Kashmir, which killed 19 soldiers.India responded with what it called “surgical strikes” across the de facto border with Pakistan. Since then there have been more minor assaults. India’s National Investigation Agency on Thursday said the militant Islamist group Lashkar-e-Taiba was to blame for the Uri attack.This month, meanwhile, Pakistan carried out its first test of a nuclear-capable missile from a submarine. Uri attack has refocussed Indian attention on how it responds to terror attacks that it believes originate from Pakistan, such as those in Mumbai in 2008 and at the Indian parliament in 2001.While India has never before acknowledged the cold-start retaliation doctrine, Pakistan has used rumours of its existence to justify keeping its defences high on the Indian border, even as its foreign partners have urged it to redeploy troops to fight Islamists elsewhere.“It is understandable in the wake of the surgical strikes that the Modi government would want to signal to Pakistan that all options are on the table in the event of another terror attack within India,” said Walter Ladwig, a lecturer in international relations at King’s College London. “However, reviving cold start — if that is what has happened — certainly escalates the rhetoric, and may raise unrealistic expectations domestically about India’s ability to respond to a new terror attack.”Mahmud Durrani, a former national security adviser to the Pakistani prime minister, said: “Pakistan already fears a rapid build-up of India’s conventional weapons. The danger is that with such warnings [of cold start], the escalatory ladder of going from conventional weapons to nuclear weapons for Pakistan will be shortened. ”Western diplomats in Islamabad, however, doubt whether India would use the cold-start plan.“Right now, its more psychological,” said one. “But that’s not to say that we shouldn’t worry about this situation. India and Pakistan both have nuclear weapons. Going by the books, two nuclear states cannot afford a war, but there is always uncertainty.”Which of the following is most opposite in meaning to the word de facto as given in the passage?1. Conjectural2. Effective3. Concrete4. Existent5. Real |
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Answer» Correct Answer - Option 1 : Conjectural De facto = in fact, whether by right or not. Conjectural = relating to conjecture i.e. without concrete evidence or facts. Concrete = strong and supported. Hence, Option 1) is the correct answer. |
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| 94269. |
In green sand mould, what is the indication of the word green?(a) It shows polymeric mould has been cured(b) Mould is green in color(c) Mould contains moisture(d) Mould has been totally dried |
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Answer» The correct option is (c) Mould contains moisture Explanation: Green sand mould contains 3-6 % of water, due to containing of moisture it is termed as green sand. Green sand has enough strength so that the constructed mould retains its shape. Moisture makes the sand more feasible and 95% reusable. |
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| 94270. |
Which of the following reasons stand for the crumbling of green sand mould?(a) The sand grains are not adequately bonded(b) Excess of water and clay mixture(c) Due to the presence of impurities in the green sand mould(d) Fine grain size |
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Answer» The correct choice is (a) The sand grains are not adequately bonded To explain: Sand mould crumbles because moulding sand is not adequately compacted in the flask. Clay, together with water acts as a bonding agent and the organic additives also save the mould from crumbling by burning out at high temperatures and make room for the moulding sand to expand. |
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| 94271. |
How can the pinholes be reduced?(a) Oxidizing(b) Deoxidizing(c) Adding ozone(d) Adding calcium carbonate |
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Answer» Right answer is (b) Deoxidizing The best I can explain: When pinholes are being produced more than necessary, the metal-mold reaction has to be deoxidized, which can cause the pinholes to reduce. |
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| 94272. |
Find the value of V1 if the current through the 1 ohm resistor=0A.(a) 83.33V(b) 78.89V(c) 87.87V(d) 33.33V |
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Answer» Right choice is (a) 83.33V The best explanation: Taking I1, I2 and I3 as the currents in the three meshes and taking I3=0 since it is the current across the 1 ohm resistor, the three mesh equations are: 15I1-5I2=V1 -5I1+10I2=0 3I2=10 Solving these equations simultaneously we get V1= 83.33V. |
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| 94273. |
What should the sulphur level in foam plastic be?(a) More than 1%(b) Between 0.5% to 1%(c) Less than 0.1%(d) Between 0.1% to 0.5% |
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Answer» The correct option is (c) Less than 0.1% Best explanation: In foam plastic, for making pattern, the sulphur level must be below 0.1%. If the levels are higher than mentioned, it can be deleterious in manufacturing. |
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| 94274. |
Sprues up to what diameters are round in section?(a) 10mm(b) 20mm(c) 30mm(d) 40mm |
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Answer» Right option is (b) 20mm The explanation: Sprues up to a diameter of 20mm cross section are round in shape. Sprues required with a larger cross section are known to be rectangular in shape. |
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| 94275. |
In the given below graph, which curve represents the permeability of the green sand mould with the % of the water content?(a) a(b) b(c) c(d) d |
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Answer» The correct answer is (c) c The explanation: There is optimum water content for the permeability considerations. At a lower water content, dry clay powder, being finer than sand grains, fills up the voids between the sand particles, and thus reduces the permeability. Beyond the optimum water content, water itself fills up the voids and reduces the permeability. |
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| 94276. |
Which of the following materials require a longer pouring time?(a) Non-ferrous material(b) Grey cast iron(c) Ferrous alloys(d) Brass |
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Answer» Right choice is (a) Non-ferrous material For explanation: For nonferrous material, a longer pouring time would be beneficial since they lose heat slowly and also tend to form dross if a metal is poured too quickly, this dross makes the quality of the material poor and further defects induced in the material. |
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| 94277. |
Which of the following is the purpose of runner extension?(a) To make smooth surface finish(b) To make the casting of specific size and shape(c) To remove slag and dross from the metal(d) To make fast cooling of molten metal |
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Answer» Correct option is (c) To remove slag and dross from the metal The best I can explain: The metal which moves first into the gating system is likely to contain slag and dross which should not be allowed to get into the mould cavity. This could be achieved by extending the runner beyond the in-gate so the clean metal can be expected to go into the mould after completely filling the runner extension. |
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| 94278. |
In sand slinging, which of the following parts is used for the spraying of moulding sand into the flask?(a) Biscuit(b) Runner(c) Diffuser(d) Nozzle |
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Answer» Correct choice is (d) Nozzle The explanation: In the sand slinging method of ramming, the sand is uniformly sprayed into the mould by moving the nozzle through the entire area of the flask. Also, it is necessary that the sand is sprayed in layers to achieve uniform hardness. This method is very economical and widely used for ramming. |
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| 94279. |
Rat tails and buckles in sand casting are caused by __________(a) Lower strength of the solidified metal(b) Lower refractoriness of the moulding sand(c) Lower strength of the moulding sand(d) Lower hardness of the moulding sand |
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Answer» The correct choice is (c) Lower strength of the moulding sand Explanation: Lower strength of the moulding sand causes rat tails and buckles type of defect in manufacturing of casting. |
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| 94280. |
Permeability of green sand ________(a) Increases with ramming(b) Decreases with ramming(c) Can increase and decrease as well with the amount of ramming(d) Does not alter with ramming |
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Answer» Right answer is (b) Decreases with ramming The best explanation: The permeability of green sand decreases with an intensity of ramming done on the sand. Hence, the amount of clay is adjusted to keep permeability in a profitable zone. |
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| 94281. |
In a three piece pattern moulding arrangement, what keeps the alignment between the two parts of the pattern?(a) Cope(b) Drag(c) Dowel pins(d) Cheek |
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Answer» Right choice is (c) Dowel pins To explain I would say: Cope and drag are the portions of upper and lower part of the split and cheek form the middle one. Dowel pins are used for the alignment work in the pattern. |
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| 94282. |
Which of the following functions of A and B may be performed if A and B possess different dimensionsA. `(A)/(e^(A/B))`B. `(B)/(log((A)/(B)))`C. `(A)/(B)`D. `e^(((B)/(A+B))` |
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Answer» Correct Answer - C Option A and B are incorrect since `((A)/(B))` should be dimensionless. |
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| 94283. |
What is the disadvantage of hand molding?(a) Damage to the projections(b) Costly method(c) Non-uniform strength(d) Poor surface finish of the mold |
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Answer» Correct choice is (c) Non-uniform strength The explanation: In hand molding, the ramming force required for compressing the molding sand is applied by human hand. A human knows about projection in the pattern accordingly he applies force thus no damage to projections. Surface finish obtained is also good. But, the force applied is non-uniform which results in non-uniform strength. |
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| 94284. |
In sand preparation, which of the following is not used as an additive?(a) Clay(b) Cereal(c) Wax(d) Moisture |
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Answer» Correct option is (c) Wax The explanation is: Among the following, clay and cereals are binders, hence used. Moisture too is needed for sand preparation, but in case of wax, it is not counted among additives. |
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| 94285. |
If the ruling gradient is 1 in 150 on a particular section of broad gauge and at the same time a curve of 4 degree is situated on this ruling gradient, what is the allowable ruling gradient ?1. 1 in 102. 1 in 723. 1 in 1964. 1 in 245 |
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Answer» Correct Answer - Option 3 : 1 in 196 Explanation: Given, Degree of curve = 4 °, Ruling Gradient = 1 in 150 Grade compensation for BG curve = 0.04 × D = 0.16% Ruling gradient = \(\frac{1}{{150}} \times 100 = 0.67\% \) ∴ Allowable gradient = 0.67 – 0.16 = 0.51% = 0.51/100 = 1 in 196 |
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| 94286. |
In Solid casting method, the resin mixture is kept for how much time for hardening and curing?(a) 1-2 hours(b) 2-3 hours(c) 3-4 hours(d) 4-5 hours |
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Answer» Correct choice is (b) 2-3 hours Easiest explanation: A mould of Plaster of Paris is made, into which the resin mixture is poured, in solid casting. This mixture takes up 2-3 hours to harden and get cured. |
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| 94287. |
Which of the following is not used as an additive?(a) Dextrin(b) Coal dust(c) Pitch(d) Zinc |
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Answer» The correct choice is (d) Zinc Explanation: Zinc is an alloying element and is not considered as additive. |
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| 94288. |
What is the melting point of Zircon?(a) 3450°F – 4620°F(b) 3750°F – 4820°F(c) 3850°F – 4820°F(d) 4400°F – 5320°F |
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Answer» Right answer is (a) 3450°F – 4620°F Easiest explanation: According to the properties of granular refractories, Zircon has a melting point temperature of 3450°F to 4620°F. Zircon is a kind of material which does not show much changes in physical aspects on exceedingly high temperatures. |
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| 94289. |
On a section of B.G track, the ruling gradient is 1 in 200. If the track is laid in that place at a curve of 5°, then the allowable ruling gradient on the curve will be1. 1 in 3332. 1 in 5553. 1 in 6664. 1 in 444 |
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Answer» Correct Answer - Option 1 : 1 in 333 Concept: Grade compensation: The ruling gradient is the maximum gradient on a particular section, but if a curve lies on a ruling gradient, the resistance due to gradient is increased by that due to curvature, and this further increases the resistance beyond the ruling gradient. In order to avoid resistances beyond the allowable limits, the gradients are reduced on curves, and this reduction is known as the grade compensation for the curve. Allowable ruling gradient = Ruling gradient - Grade compensation Grade compensation (GC) for BG = 0.04% per degree of curve Calculation Given, Degree of curve D = 5° Ruling Gradient = 1 in 200 So for 5° curve, compensation, = 0.04 × 5 = 0.20% ∴ Ruling gradient \(= \frac{1}{{200}} \times 100 = 0.5{\rm{\% }}\) ∴ Allowable gradient = (0.5 - 0.2)% =\( {\rm{\;}}\frac{{0.3}}{{100}} = \frac{1}{{333}}\) ∴ Allowable Gradient = 1/333 |
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| 94290. |
Calcium carbide reacts with moisture to give out which gas?(a) Acetylene gas(b) Methane(c) Carbon dioxide(d) Carbon monoxide |
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Answer» Right choice is (a) Acetylene gas Easy explanation: According to the chemical reaction, Calcium carbide when reacts with moisture, that is water, it is observed to give out calcium hydroxide and acetylene gas. |
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| 94291. |
Which of the labeled part of the following diagram is a core?(a) a(b) b(c) c(d) d |
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Answer» Correct option is (c) c The best I can explain: A core is that element which is used in moulding processes to make hollow cavities or holes or to give special contours on the casting which are difficult or expensive to be machined. |
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| 94292. |
Which of the following component is not a part of the passive filter?(a) resistor(b) operational amplifier(c) capacitor(d) inductor |
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Answer» Right option is (b) operational amplifier Explanation: Operational amplifier is not a part of passive filters. It is a part of an active filter. Passive components are resistors capacitors and inductors. Active filters use opamps in addition to passive components in order to obtain better performance. |
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| 94293. |
Which of the following is not a core sand ingredient?(a) Water(b) Wax(c) Granular refractories(d) Core binders |
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Answer» Right choice is (b) Wax To explain I would say: For the core material, water, granular refractories and core binders are ingredients which are highly used. The ingredients used do not involve wax in it and hence is not a part of the ingredients. |
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| 94294. |
How much time is taken by sand, for sand preparation in terms of muller time?(a) 33 to 50 percent of muller time(b) 14 to 29 percent of muller time(c) 25 to 40 percent of muller time(d) 46 to 62 percent of muller time |
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Answer» Right choice is (a) 33 to 50 percent of muller time The best I can explain: Muller time is the time needed for the high speed muller to complete its function. For sand preparation, approximately 33 to 50 percent of muller time is needed. |
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| 94295. |
What is the advantage of having a low bulk density of a sand-mix?(a) Higher strength(b) Good refractoriness(c) Higher flow ability(d) Higher permeability |
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Answer» Right option is (d) Higher permeability To explain: Low bulk density of sand mix results in equal size of grains with smooth round shape, this further results in increase in volume of voids due to less bulk density and hence a higher permeability which permits an easy outflow of the gases from the molten metal. |
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| 94296. |
How much time does a centrifugal muller take to mix the core ingredients?(a) 20 – 50 seconds(b) 10 – 40 seconds(c) 50 – 80 seconds(d) 60 – 90 seconds |
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Answer» Correct option is (d) 60 – 90 seconds To elaborate: A centrifugal muller takes around 60 seconds to 90 seconds to get the core ingredients mixed properly, whereas a normal muller takes about 4 minutes for mixing the ingredients. |
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| 94297. |
Which of the following is a material employed making diaphragm to measure pressure?(a) tourmaline(b) barium titanate(c) phosphor bronze(d) zirconate titanate |
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Answer» Right choice is (c) phosphor bronze Explanation: Phosphor bronze is used to make diaphragm to measure pressure. The motion of diaphragm is measured in terms of electric signals. Tourmaline , barium titanate and zirconate titanate are piezo electric materials. |
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| 94298. |
How much time does a normal muller take to mix the core ingredients?(a) 2 – 5 minutes(b) 3 – 6 minutes(c) 4 – 7 minutes(d) 5 – 9 minutes |
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Answer» The correct answer is (b) 3 – 6 minutes For explanation: A normal muller takes around 3 minutes to 6 minutes to get the core ingredients mixed properly, whereas a centrifugal muller takes around 30 seconds to one minute to mix the core ingredients. |
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| 94299. |
What is the green compression strength of core sand mixture for general purpose?(a) 1/5 kg/cm^2(b) 1/6 kg/cm^2(c) 1/7 kg/cm^2(d) 1/8 kg/cm^2 |
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Answer» Right answer is (c) 1/7 kg/cm^2 Explanation: The green compression strength of core sand mixture for general purpose is 1/7 kg/cm^2, whereas the dry compression strength of a core sand mixture is found to be 70 kg/cm^2. |
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| 94300. |
Out of the following, which one is not a source of electrical energy?(a) Solar cell(b) Battery(c) Potentiometer(d) Generator |
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Answer» Right answer is (c) Potentiometer Explanation: Solar cell converts light energy to electrical energy. Battery converts chemical energy to electrical energy. Generator generates electrical energy using electromagnetic induction. A potentiometer is an instrument used for measuring voltage and consumes electrical energy instead of generating it. |
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