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MCQOPTIONS
This section includes 2670 Mcqs, each offering curated multiple-choice questions to sharpen your Railways knowledge and support exam preparation. Choose a topic below to get started.
| 2551. |
Consider the following statements: For precision machining of non-ferrous alloys diamond is preferred because it has 1. Low coefficient of thermal expansion 2. High compression strength 3. High compression strength 4. How fracture toughness Which of these statements are correct? |
| A. | 1 and 2 |
| B. | 2 and 4 |
| C. | 2 and 3 |
| D. | 3 and 4 |
| Answer» B. 2 and 4 | |
| 2552. |
A 400 mm long shaft has 100 mm tapered step at the middle with \[4{}^\circ \] inclined angle. The tailstock offset required to produce this taper on a lathe would be: |
| A. | 400 sin \[4{}^\circ \] |
| B. | 400 sin \[2{}^\circ \] |
| C. | 100 sin \[4{}^\circ \] |
| D. | 100 sin \[2{}^\circ \] |
| Answer» E. | |
| 2553. |
Match List-I (Gear component) with List-II (Preferred method of manufacturing) and select the correct answer using the codes given below the lists: List-I List-II A. Gear for clocks 1. Hobbing B. Bakelite gears 2. Stamping C. Aluminium gears 3. Powder compacting D. Automobile transmission gears 4. Sand casting 5. Extrusion Codes: |
| A. | A\[\to \]2, B\[\to \]3, C\[\to \]5, D\[\to \]1 |
| B. | A\[\to \]5, B\[\to \]3, C\[\to \]4, D\[\to \]2 |
| C. | A\[\to \]5, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| D. | A\[\to \]2, B\[\to \]4, C\[\to \]5, D\[\to \]3 |
| Answer» B. A\[\to \]5, B\[\to \]3, C\[\to \]4, D\[\to \]2 | |
| 2554. |
Which of the following motions are not needed for spur gear cutting with a hob? 1. Rotary motion of hob 2. Linear axial reciprocatory motion of hob 3. Rotary motion of gear blank 4. Radial advancement of hob. Select the correct answer using the codes given below: |
| A. | 1, 2 and 3 |
| B. | 1, 3 and 4 |
| C. | 1, 2 and 4 |
| D. | 2, 3 and 4 |
| Answer» E. | |
| 2555. |
Consider the following statements pertaining to a centrifugal pump 1. The manometric head is the head developed by 2. The suction pipe has, generally, a larger diameter as compared to the discharge pipe. 3. The suction pipe is provided with a foot valve and a strainer. 4. The delivery pipe is provided with a foot valve and a strainer. Of these statements: |
| A. | 1, 2 and 3 and 4 are correct |
| B. | 1 and 2 are correct |
| C. | 2 and 3 are correct |
| D. | 1 and 3 are correct |
| Answer» D. 1 and 3 are correct | |
| 2556. |
The vertical component of force on a curved surface submerged in a static liquid is equal to the |
| A. | Weight of liquid column above the C.G. of the curved surface |
| B. | Weight of liquid above the curved surface |
| C. | Product of pressure at C.G, multiplied by the area of the curved surface |
| D. | Product of pressure at C.G, multiplied by the projected area of the curved surface. |
| Answer» C. Product of pressure at C.G, multiplied by the area of the curved surface | |
| 2557. |
If a reciprocating pump having a mechanical efficiency of 80% delivers water at the rate of 80 kg/s with a head of 30 m, the brake power of the pump is: |
| A. | 29.4 kW |
| B. | 20.8 kW |
| C. | 15.4 kW |
| D. | 10.8 kW |
| Answer» B. 20.8 kW | |
| 2558. |
Consider the specific speed ranges of the following types of turbines: 1. Francis 2. Kaplan 3. Pelton. The sequence of their specific speed in increasing order is: |
| A. | 1, 2, 3 |
| B. | 3, 1, 2 |
| C. | 3, 2, 1 |
| D. | 2, 3, 1 |
| Answer» C. 3, 2, 1 | |
| 2559. |
Match List-I (Expansion device) with List-II (Operation) and select the correct answer using the codes given below the lists: List-I (Expansion device) List-II (Operation) A. Float valve 1. Constant degree of superheat at evaporator exit pressure B. Automatic expansion valve 2. Constant degree of superheat at evaporator inlet pressure C. Internally equalized thermostatic expansion valve 3. Constant level of refrigerant in the evaporator D. Extrammaly equalized thermostatic expansion valve 4. Constant pressure in the evaporator Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 |
| B. | A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 |
| C. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| D. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| Answer» D. A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 | |
| 2560. |
Consider the following statements regarding the axial flow in an air compressor: 1. Surging is a local phenomenon while stalling affects the entire compressor. 2. Stalling is a local phenomenon while surging affects the entire compressor. 3. The pressure ratio of an axial compressor stage is smaller than that of a centrifugal compressor stage. Of these statements: |
| A. | 1, 2 and 3 are correct |
| B. | 1 and 2 are correct |
| C. | 2 and 3 correct |
| D. | 1 and 3 correct |
| Answer» E. | |
| 2561. |
For maximum blade efficiency of a single-stage impulse turbine, the blade speed ratio, (\[\alpha \] is the angle made by absolute velocity at inlet) should be: |
| A. | \[\cos \,2\alpha \] |
| B. | \[\frac{\cos \,2\alpha }{2}\] |
| C. | \[\frac{\cos \alpha }{2}\] |
| D. | \[\frac{2}{\cos \alpha }\] |
| Answer» D. \[\frac{2}{\cos \alpha }\] | |
| 2562. |
Match List-I (Machines) with List-II (Features) and select the correct answer using the codes given below the lists: List-I (Machine) List-II (Features) A. Steam engine 1. Velocity compounding B. Impulse turbine 2. Diagram factor C. Reaction turbine 3. Continuous pressure drop D. Centrifugal compressore 4. Isentropic efficiency Codes: |
| A. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| B. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| C. | A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 |
| D. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| Answer» C. A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 | |
| 2563. |
Consider the following statements: Sub cooling in the condenser of a refrigeration system is advisable when: 1. Expansion valve is at a higher elevation condenser. 2. There is a large pressure drop in the line connecting condenser to the expansion valve. 3. The refrigeration effect is to he increased. 4. The compressor work is to he reduced Which of these statements are correct? |
| A. | 1 and 2 |
| B. | 1, 3 and 4 |
| C. | 2, 3 and 4 |
| D. | 1, 2 and 3 |
| Answer» D. 1, 2 and 3 | |
| 2564. |
Small amount of carbonaceous material sprinkled on the inner surface of mould cavity is called: |
| A. | Backing sand |
| B. | facing sand |
| C. | Green sand |
| D. | dry sand |
| Answer» C. Green sand | |
| 2565. |
Which of the following casting processes does not do not require Central core for producing pipe? 1. Sand casting process 2. Die casting process 3. Centrifugal casting process Select the correct answer using the code given below: |
| A. | 1 and 2 |
| B. | 2 only |
| C. | 2 and 3 |
| D. | 3 only |
| Answer» E. | |
| 2566. |
The pattern adopted for those castings where there are some portions which are structurally weak and are likely to break by the force of ramming are called: |
| A. | Loose piece pattern |
| B. | follow board pattern |
| C. | Skelton pattern |
| D. | single piece pattern |
| Answer» B. follow board pattern | |
| 2567. |
Match List-I with List-II and select the correct answer using the codes 'given below the lists: List-I (Casting process) List-II (Principle) A. Die casting 1. The metal solidifies in a rotating mould B. Investment casting 2. The pattern cluster is repeatedly dipped into a ceramic slurry and dusted with refractory C. Shell moulding 3. Molten metal is forced by pressure into a metallic mould D. Centrifugal casting 4. After cooling, the invest is removed from the casting by pressure jetting or vibratory cleaning Codes: |
| A. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| B. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| C. | A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 |
| D. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| Answer» C. A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 | |
| 2568. |
Match List-I (Type of moulding) with List-II (Mechanism involved) and select the correct answer using the codes given below the lists: List-I (Type of moulding) List-II (Type of moulding) A. Compression moulding 1. Mould cavity-must be heated to cure the plastic forced into it B. Injected 2. Similar to Hydraulic extrusion C. Jet moulding 3. analogous to hot-pressing of powdered metals D. Extrusion moulding 4. analogous to die casting of metals Codes: |
| A. | A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 |
| B. | A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 |
| C. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| D. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| Answer» C. A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 | |
| 2569. |
Match List I (Products) with List II (Casting process) and select the correct answer using "the codes given below the lists : List-I (Products) List-II (Casting process) A. Hollow statues 1. Centrifugal casting B. Dentures 2. Investment casting C. Aluminium alloy pistons 3. Slush casting D. Rocker arms 4. Shell moulding 5. Gravity die casting Codes: |
| A. | A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]5 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]4, D\[\to \]5 |
| C. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| D. | A\[\to \]3, B\[\to \]2, C\[\to \]5, D\[\to \]4 |
| Answer» E. | |
| 2570. |
Which of the following pattern-materials are used in Precision Casting? 1. Plaster of Paris 2. Plastics 3. Anodized aluminium alloy 4. Frozen mercury Select the correct answer using the codes given below: Codes: |
| A. | 1 and 2 |
| B. | 2 and 4 |
| C. | 3 and 4 |
| D. | 1 and 3 |
| Answer» B. 2 and 4 | |
| 2571. |
Directional solidification can be achieved by providing: |
| A. | Chills and chaplets |
| B. | Chaplets and padding |
| C. | Chills and padding |
| D. | Chills, chaplets and padding |
| Answer» D. Chills, chaplets and padding | |
| 2572. |
A gating ratio of 1 : 2 : 4 is used to design the gating system for magnesium alloy casting. This gating ratio refers to the cross-section areas of the various gating elements as given below: 1. Down sprue 2. Runner bar 3. Ingates The correct sequence of the above elements in the ratio 1 : 2 : 4 is: |
| A. | 1, 2 and 3 |
| B. | 1, 3 and 2 |
| C. | 2, 3 and 1 |
| D. | 3, 1 and 2 |
| Answer» B. 1, 3 and 2 | |
| 2573. |
According to Chvorinov's equation, the solidification time of a casting is proportional to: Where, v = volume of casting |
| A. | \[{{v}^{2}}\] |
| B. | \[v\] |
| C. | \[1/v\] |
| D. | \[1/{{v}^{2}}\] |
| Answer» B. \[v\] | |
| 2574. |
Shell moulding can be used for: |
| A. | Producing milling cutters |
| B. | Making gold ornaments |
| C. | Producing heavy and thick walled casting |
| D. | Producing thin casting |
| Answer» E. | |
| 2575. |
In gating system design, which one of the following is the correct sequence in which choke area, pouring time, pouring basin and sprue sizes are calculated? |
| A. | Choke area - pouring time - pouring basin -sprue |
| B. | Pouring basin - sprue - choke area - pouring |
| C. | Choke area - sprue - pouring basin ? pouring time |
| D. | Pouring basin - pouring time - choke area - sprue |
| Answer» D. Pouring basin - pouring time - choke area - sprue | |
| 2576. |
In shell moulding, how can the shell thickness h accurately maintained? |
| A. | By controlling the time during which the pattern is in contact with mould |
| B. | By controlling the time during which the pattern is heated. |
| C. | By maintaining the temperature of the pattern in the range of \[175{}^\circ C-380{}^\circ C\] |
| D. | By the type of binder used |
| Answer» D. By the type of binder used | |
| 2577. |
Which one of the following processes produces casting when pressure forces the molten metal into the mould cavity? |
| A. | Shell moulding |
| B. | investment casting |
| C. | Die casting |
| D. | continuous casting |
| Answer» D. continuous casting | |
| 2578. |
The gating ratio 2 : 8 : 1 for copper in gating system design refers to the ratio of areas of: |
| A. | Sprue : runner : ingate |
| B. | Runner: ingate : sprue |
| C. | Runner : sprue : ingate |
| D. | Ingate : runner : sprue |
| Answer» D. Ingate : runner : sprue | |
| 2579. |
Scab is a: |
| A. | Sand casting defect |
| B. | machining defect |
| C. | Welding defect |
| D. | forging defect |
| Answer» B. machining defect | |
| 2580. |
The main purpose of chaplets is: |
| A. | To ensure directional solidification |
| B. | To provide efficient venting |
| C. | For aligning the mould boxes |
| D. | To support the cores |
| Answer» E. | |
| 2581. |
If the melting ratio of a cupola is 10:1, then the coke requirement for one ton melt will be: |
| A. | 0.1 ton |
| B. | 10 tons |
| C. | 1 ton |
| D. | 11 tons |
| Answer» C. 1 ton | |
| 2582. |
Which of the following materials can be used for making patterns? 1. Aluminium 2. Wax 3. Mercury 4. Lead Select the correct answer using the codes below: |
| A. | 1, 3 and 4 |
| B. | 2, 3 and 4 |
| C. | 1, 2 and 4 |
| D. | 1, 2 and 3 |
| Answer» D. 1, 2 and 3 | |
| 2583. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (Equipment) List-II (Functions) A. Hot chamber 1. Cleaning machine B. Muller 2. Core making C. Dielectric baker 3. Die casting D. Sand blasting 4. Annealing 5. Mixing Codes: |
| A. | A\[\to \]3, B\[\to \]5, C\[\to \]2, D\[\to \]1 |
| B. | A\[\to \]4, B\[\to \]2, C\[\to \]5, D\[\to \]3 |
| C. | A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 |
| D. | A\[\to \]3, B\[\to \]5, C\[\to \]1, D\[\to \]2 |
| Answer» B. A\[\to \]4, B\[\to \]2, C\[\to \]5, D\[\to \]3 | |
| 2584. |
The most preferred process for casting gas turbine blades is: |
| A. | Die moulding |
| B. | Shell moulding |
| C. | Investment moulding |
| D. | Sand casting |
| Answer» D. Sand casting | |
| 2585. |
Which one of the following is the process intermediate to compression and injection moulding? |
| A. | Reaction moulding |
| B. | transfer moulding |
| C. | Pelleting |
| D. | preheating |
| Answer» E. | |
| 2586. |
The mould in shell moulding process is made up of which of the following? |
| A. | Gypsum + setting agents |
| B. | Green sand + clay |
| C. | Sodium silicate + dried sand |
| D. | dried silica + phenolic resin |
| Answer» E. | |
| 2587. |
Which one of the following processes consists of central spruces to feed metal into the cavities through a number of radial gates? |
| A. | Centrifuging |
| B. | Semi-centrifugal casting |
| C. | True centrifugal casting |
| D. | Precision casting |
| Answer» D. Precision casting | |
| 2588. |
Match List-I (Name of the process) with List-II (Advantage) and select the correct answer using the codes given below the lists: List-I (Name of the process) List-II (Advantage) A. Sand casting 1. Large cylindrical parts with good quality B. Ceramic mold casting 2. excellent dimensional accuracy and surface finish C. Die casting 3. Intricate shapes and close tolerance parts D. Centrifugal casting 4. Almost any metal is cast and there is no limit to size, shape and weight 5. Good dimensional accuracy, finish and low porosity Codes: |
| A. | A\[\to \]2, B\[\to \]3, C\[\to \]5, D\[\to \]1 |
| B. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| C. | A\[\to \]2, B\[\to \]1, C\[\to \]5, D\[\to \]3 |
| D. | A\[\to \]4, B\[\to \]3, C\[\to \]5, D\[\to \]1 |
| Answer» E. | |
| 2589. |
Which of the following are produced by slush |
| A. | Hollow castings with thick walls |
| B. | Hollow castings with thin walls |
| C. | Thin castings |
| D. | Thick castings |
| Answer» C. Thin castings | |
| 2590. |
Which one of the following sets of constituents is expected in equilibrium cooling of a hypereutectoid steel from austenitic state? |
| A. | Ferrite and pearlite |
| B. | Cementite and pearlite |
| C. | Ferrite and bainite |
| D. | Cementite and martensite. |
| Answer» C. Ferrite and bainite | |
| 2591. |
Match List-I with List-II and select the correct answer using the codes give below the lists: List-I (Name of material) List-II (% carbon range) A. Hypo-eutectoid steel 1. \[4.3\,\,-\,\,5.67\] B. Hyper-eutectoid steel 2. \[2.0\,\,-\,\,4.3\] C. Hypo-eutectic cast iron 3. \[0.8\,\,-\,\,2.0\] D. Hyper-eutectic cast iron 4. \[0.008\,\,-\,\,0.8\] Codes: |
| A. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 |
| C. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| D. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| Answer» B. A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 | |
| 2592. |
Eutectoid reaction occurs at: |
| A. | \[600{}^\circ C\] |
| B. | \[723{}^\circ C\] |
| C. | \[114{}^\circ C\] |
| D. | \[1493{}^\circ C\] |
| Answer» E. | |
| 2593. |
Addition of magnesium to cast iron increases its: |
| A. | Hardness |
| B. | Ductility and strength in tension |
| C. | Corrosion resistance |
| D. | Creep strength. |
| Answer» C. Corrosion resistance | |
| 2594. |
The structure of a polymer is shown in the given figure. This polymer finds special application in: |
| A. | Packaging |
| B. | adhesives |
| C. | Bearings |
| D. | fertilizer |
| Answer» D. fertilizer | |
| 2595. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (Alloy) List-II (Use) A. Low carbon steel 1. Bearing B. Hadfield mangenese steel 2. Thermocouple C. Constantan 3. Wire nails D. Babbit alloy 4. Bulldozer blades Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| B. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| C. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| D. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| Answer» E. | |
| 2596. |
The main alloying elements in high speed steel in order of increasing proportion: |
| A. | Vanadium, Chromium, Tungesten |
| B. | Tungsten, Titanium, Vanadium |
| C. | Chromium, Titanium, Vanadium |
| D. | Tungsten, Chromium, Titanium |
| Answer» B. Tungsten, Titanium, Vanadium | |
| 2597. |
Presence of hydrogen in steel causes: |
| A. | Reduced neutron absorption cross-section |
| B. | Improved weld ability |
| C. | embrittlement |
| D. | Corrosion resistance. |
| Answer» D. Corrosion resistance. | |
| 2598. |
Match the following: List-I (Alloying element in steel) List-II (Effect) A. Lead 1. Restricts grain growth B. Aluminium 2. Raises yield point C. Copper 3. Reduces strength to impact D. Phosphorus 4. Free machining Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| B. | A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 |
| C. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| D. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| Answer» E. | |
| 2599. |
In a eutectic system, two elements are completely: |
| A. | Insoluble in solid and liquid state |
| B. | Soluble in liquid state |
| C. | Soluble in solid state |
| D. | Insoluble in liquid state. |
| Answer» C. Soluble in solid state | |
| 2600. |
Heating the hypo-eutectoid steels to \[30{}^\circ C\] above the upper critical temperature line, soaking at the temperature and then cooling slowly to room temperature to form a pearlite and ferrite structure, is known as; |
| A. | Hardening |
| B. | Normalizing |
| C. | Tempering |
| D. | Annealing |
| Answer» E. | |