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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.
| 301. |
The pitching of a ship in the ocean is an oscillatory periodic motion. A ship is pitching \[6{}^\circ \] above and \[6{}^\circ \] below with a period of 20s from its horizontal plane. Consider the following statements in this regard: 1. The motion has a frequency of oscillation (i.e. pitching) of 3 cycles/minute. 2. The motion has an angular frequency of 3.14 rad/s 3. The angular velocity of precession of ship?s rotor is \[\frac{\pi }{300}\] rad/s 4. The amplitude of pitching is \[\frac{\pi }{30}\] rad Which of these statements are correct? |
| A. | 1 and 2 |
| B. | 1, 2 and 4 |
| C. | 2, 3 and 4 |
| D. | 1, 3 and 4 |
| Answer» D. 1, 3 and 4 | |
| 302. |
Which of the following pairs are correctly matched? Select the correct answer using the codes given below the pairs. Mechanism Chain from which derived 1. Whitworth quick return motion Single slider crank chain 2. Oldham's coupling Four-bar chain 3. Scotch Yoke Double slider crank chain Codes: |
| A. | 1 and 2 |
| B. | 1, 2 and 3 |
| C. | 1 and 3 |
| D. | 2 and 3 |
| Answer» D. 2 and 3 | |
| 303. |
Which of the following statements is true for the case of a transfer line? |
| A. | The work stations must form a closed-loop |
| B. | The cycle time is total time taken by all the machining operations |
| C. | All the machine tools must be automatic |
| D. | All the machine tools must be of conventional and general purpose type |
| Answer» B. The cycle time is total time taken by all the machining operations | |
| 304. |
In a mechanical shaper, the length of stroke is increased by: |
| A. | Increasing the centre distance of bull gear and crank pin |
| B. | Decreasing the centre distance of bull gear and crank pin |
| C. | Increasing the length of the ram |
| D. | Decreasing the length of the slot in the slotted lever |
| Answer» B. Decreasing the centre distance of bull gear and crank pin | |
| 305. |
While cutting helical gears on a non-differential gear hobber, the feed change gear ratio is: |
| A. | Independent of index change gear ratio |
| B. | Dependent on speed change gear ratio |
| C. | Interrelated to index change gear ratio |
| D. | Independent of speed and index change gear ratio |
| Answer» D. Independent of speed and index change gear ratio | |
| 306. |
If the area of cross-section of a wire is circular and if the radius of this circle decreases to half its original value due to the stretch of the wire by a load, then the modulus of elasticity of the wire will be: |
| A. | One-fourth of its original value |
| B. | Halved |
| C. | Doubled |
| D. | Unaffected |
| Answer» E. | |
| 307. |
A steel rod of 1 sq. cm. cross sectional area is 100 cm long and has a Young's modulus of elasticity \[2\times {{10}^{6}}\,\text{kg/c}{{\text{m}}^{\text{2}}}.\]it is subjected to an axial pull of 2000 kgf. The elongation of the rod will be: |
| A. | 0.05 cm |
| B. | 0.1 cm |
| C. | 0.15 cm |
| D. | 0.20 cm |
| Answer» C. 0.15 cm | |
| 308. |
A vertical sluice gate, 2.5 m wide and weighing 500 kg is held in position due to horizontal force of water on one side and associated friction force. When the water level drops down to 2 m above the bottom of the gate, the gate just starts sliding down. The coefficient of friction between the gate and the supporting structure is: |
| A. | 0.20 |
| B. | 0.1 |
| C. | 0.05 |
| D. | 0.02 |
| Answer» C. 0.05 | |
| 309. |
The reheat cycle in steam power plant is mainly adopted to |
| A. | Improve thermal efficiency |
| B. | Decrease the moisture content in low pressure stages to a safe value |
| C. | Decrease the capacity of condenser |
| D. | Recover the waste heat of toiler |
| Answer» B. Decrease the moisture content in low pressure stages to a safe value | |
| 310. |
Consider the following statements: In a vapour compression system, a thermometer placed in the liquid line can indicate whether the: 1. Refrigerant flow is too low 2. Water circulation is adequate. 3. Condenser is fouled. 4. Pump is functioning properly. Of these statement: |
| A. | 1, 2 and 3 are correct |
| B. | 1, 2 and 4 are correct |
| C. | 1, 3 and 4 are correct |
| D. | 2, 3 and 4 are correct |
| Answer» E. | |
| 311. |
Match List-I with List-II and select the correct answer using the codes given below the Lists. List-I List-II A. Bell Column refrigeration 1. Compressor B. Vapour compression refrigeration 2. Generator C. Absorption refrigeration 3. Flash chamber D. Jet refrigeration 4. Expansion cylinder Codes: |
| A. | A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2 |
| B. | A\[\to \]4, B\[\to \]1, C\[\to \]3, D\[\to \]2 |
| C. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| D. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| Answer» E. | |
| 312. |
For steady flow through an insulated horizontal constant diameter pipe, this property remains constant |
| A. | Enthalpy |
| B. | Internal energy |
| C. | Entropy |
| D. | Volume |
| Answer» B. Internal energy | |
| 313. |
100 kJ of energy is transferred from a heat reservoir at 1000 K to a heat reservoir at 500 K. The ambient temperature is 300 K. The loss of available energy due to heat transfer process is: |
| A. | 20 kJ |
| B. | 30 kJ |
| C. | 40 kJ |
| D. | 50 kJ |
| Answer» C. 40 kJ | |
| 314. |
Match List-I (End conditions of columns) with List-II (Equivalent length in terms of length of hinged-hinged column) and select the correct answer using the codes given below the lists: List-I List-II A. Both ends hinged 1. L B. One end fixed and other end free 2. \[L\,/\sqrt{2}\] C. One end fixed and the other pin-jointed 3. \[\frac{L}{2}\] D. Both ends fixed 4. 2L Codes: |
| A. | A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2 |
| B. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| C. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| D. | A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 |
| Answer» C. A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 | |
| 315. |
Which of the following site will be preferred for earthing? |
| A. | Wet mashy ground |
| B. | Clay soil |
| C. | Loam mixed with small quantities of sand |
| D. | Damp and wet sand pit |
| Answer» B. Clay soil | |
| 316. |
When shaking force is transmitted through the spring, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than: |
| A. | 0.25 |
| B. | 0.5 |
| C. | 1.00 |
| D. | sqrt 2 |
| Answer» C. 1.00 | |
| 317. |
When the mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, it will: |
| A. | Return to equilibrium position without oscillation |
| B. | Oscillate with increasing time period |
| C. | Oscillate with decreasing amplitude |
| D. | Oscillate with constant amplitude |
| Answer» B. Oscillate with increasing time period | |
| 318. |
For a disc mounted shaft to rotate with light side of disc out: Where \[\beta =\frac{\omega }{{{\omega }_{c}}}\] |
| A. | \[\beta <1\] |
| B. | \[\beta =1\] |
| C. | \[\beta >1\] |
| D. | \[\beta <<1\] |
| Answer» D. \[\beta <<1\] | |
| 319. |
Match List-I with List-II and select the correct answer using the codes given below the Lists: List-I List-II A. 4 links, 4 turning pair 1. Complete constraint B. 3 links, 3 turning pair 2. Successful constraint C. 5 links, 5 turning pair 3. Rigid Frame D. Footstep bearing 4. Incomplete constant Codes: |
| A. | A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 |
| C. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| D. | A\[\to \]1, B\[\to \]3, C\[\to \]4, D\[\to \]2 |
| Answer» E. | |
| 320. |
For a given fractional change of speed, if the displacement of the sleeve is high, then the governor is said to be: |
| A. | Hunting |
| B. | Isochronous |
| C. | Sensitive |
| D. | Stable |
| Answer» D. Stable | |
| 321. |
Under logarithmic decrement, the amplitude of successive vibrations are: |
| A. | constant |
| B. | In arithmetic progression |
| C. | In geometric progression |
| D. | In logarithmic progression |
| Answer» C. In geometric progression | |
| 322. |
Air standard diesel cycle has a compression ratio of 14 and cut-off takes place at 6% of the stroke. What is the cut-off ratio? |
| A. | 0.60 |
| B. | 0.78 |
| C. | 1.78 |
| D. | None of the above |
| Answer» D. None of the above | |
| 323. |
The thermal efficiency of the Carnot engine is 0.5. If the engine is operated as refrigerator, what is the COP of the refrigerator? |
| A. | 0.5 |
| B. | 1.0 |
| C. | 2.0 |
| D. | 25 |
| Answer» C. 2.0 | |
| 324. |
In a reversible isothermal expansion process, the fluid expands, from 10 bar and \[2\,{{m}^{3}}\] to 2 bar and \[10\,{{m}^{3}}.\] during the process the heat supplied is at the rate of 100 kW. What is the rate of work done during the process? |
| A. | 20 kW |
| B. | 35 kW |
| C. | 80 kW |
| D. | 100 kW |
| Answer» E. | |
| 325. |
Air from a reservoir is to be passed through a supersonic nozzle so that the jet will have a Mach Number of 2. If the static temperature of the jet is not to be less than \[27{}^\circ C,\] the minimum temperature of air in the reservoir should be: |
| A. | \[48.6{}^\circ C\] |
| B. | \[167{}^\circ C\] |
| C. | \[267{}^\circ C\] |
| D. | \[367{}^\circ C\] |
| Answer» B. \[167{}^\circ C\] | |
| 326. |
What are the main components of an NC machine? 1. Part program 2. Machine control unit 3. Servo meter Select the correct answ.er using the code given below: |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1 and 3 only |
| Answer» B. 1 and 2 only | |
| 327. |
A system undergoes a change of state during which 80 kJ of heat is transferred to it and it does 60 kJ of work. The system is brought hack to its original slate through a process during which 100 kJ of heat is transferred to it. The work done by the system is: |
| A. | 40 kJ |
| B. | 60 KJ |
| C. | 120 kJ |
| D. | 180 kJ |
| Answer» D. 180 kJ | |
| 328. |
If the value of Poisson's ratio is zero, then it means that: |
| A. | The material is rigid |
| B. | There is no longitudinal strain in the material |
| C. | The material is perfectly plastic |
| D. | The longitudinal strain in the material is infinite |
| Answer» B. There is no longitudinal strain in the material | |
| 329. |
When a process undergoes a complete cycle then the change of entropy will be |
| A. | \[+ve\]value |
| B. | \[-ve\]value |
| C. | zero value |
| D. | \[+ve\]or \[-ve\]depending on initial condition |
| Answer» D. \[+ve\]or \[-ve\]depending on initial condition | |
| 330. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (Track numbers on paper tape) List-II (Holes on those tracks represent) A. Track nos. 1 to 4 1. Alphabets B. Track no. 5 2. Numerals C. Track nos. 6 and 7 3. End of block D. track no. 8 4. Block number 5. Parity check Codes: |
| A. | A\[\to \]2, B\[\to \]5, C\[\to \]1, D\[\to \]3 |
| B. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]5 |
| C. | A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3 |
| D. | A\[\to \]1, B\[\to \]5, C\[\to \]2, D\[\to \]3 |
| Answer» B. A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]5 | |
| 331. |
The type of quick return mechanism employed mostly in shaping machines is: |
| A. | DC reversible motor |
| B. | Fast and loose pulleys |
| C. | Whitworth motion |
| D. | Slotted link mechanism |
| Answer» E. | |
| 332. |
Which of the following arc valid statements for point-to-point motion of the tool in APT language? 1. GO/TO/....... 2. GODLTA/......... 3. GO/TO....... Select the correct answer using the codes given below: |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1 and 3 |
| D. | 1, 2 and 3 |
| Answer» D. 1, 2 and 3 | |
| 333. |
Orsat gas analyzer determines volumetric composition of the flue gases in respect of: |
| A. | \[{{O}_{2}}\] and \[{{N}_{2}}\] |
| B. | \[{{O}_{2}}\] and \[C{{O}_{2}}\] |
| C. | \[C{{O}_{2}}\] CO and \[{{N}_{2}}\] |
| D. | \[{{N}_{2}},\] \[{{O}_{2}},\] \[C{{O}_{2}}\] and CO |
| Answer» E. | |
| 334. |
Consider the following statements: 1. Two reversible adiabatics can never intersect each other. 2. for a thermodynamic process \[\frac{dQ}{T}+1\ge 0,\] where I is the measure of irreversibility. Which of the statements given above is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | neither 1 nor 2 |
| Answer» B. 2 only | |
| 335. |
According to the Maxwell relation, which of the following is/arc correct? |
| A. | \[{{\left( \frac{\partial v}{\partial T} \right)}_{p}}=-\,{{\left( \frac{\partial s}{\partial p} \right)}_{T}}\] |
| B. | \[{{\left( \frac{\partial s}{\partial v} \right)}_{p}}={{\left( \frac{\partial p}{\partial T} \right)}_{v}}\] |
| C. | \[{{\left( \frac{\partial P}{\partial T} \right)}_{v}}={{\left( \frac{\partial p}{\partial s} \right)}_{v}}\] |
| D. | All of the above |
| Answer» B. \[{{\left( \frac{\partial s}{\partial v} \right)}_{p}}={{\left( \frac{\partial p}{\partial T} \right)}_{v}}\] | |
| 336. |
When two springs of equal length are arranged to form a cluster spring then which of the following statements are true: 1. Angle of twist in both the springs will be equal 2. Deflection of both the springs will be equal 3. Load taken by each spring will be half the total load 4. Shear stress in each spring will be equal |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 2 and 4 only |
| D. | 1, 2 and 4 only |
| Answer» D. 1, 2 and 4 only | |
| 337. |
The optimum intermediate pressure p, for a gas turbine plant operating between pressure limits \[{{p}_{1}}\] and \[{{p}_{2}}\] with perfect intercolling between the two stages of compression (with identical isentropic efficiency) is given by: |
| A. | \[{{p}_{1}}={{p}_{2}}-{{p}_{1}}\] |
| B. | \[{{p}_{i}}={{p}_{i}}=\frac{1}{2}({{p}_{1}}+{{p}_{2}})\] |
| C. | \[{{p}_{i}}=\sqrt{{{p}_{1}}.{{p}_{2}}}\] |
| D. | \[{{p}_{i}}=\sqrt{p_{2}^{2}.p_{1}^{2}}\] |
| Answer» D. \[{{p}_{i}}=\sqrt{p_{2}^{2}.p_{1}^{2}}\] | |
| 338. |
In a M/M/I queuing system, expected waiting time of a unit that actually waits is given y? |
| A. | \[\frac{\lambda }{{{\mu }^{2}}(\mu -\lambda )}\] |
| B. | \[\frac{\lambda }{\mu -\lambda }\] |
| C. | \[\frac{1}{\mu -\lambda }\] |
| D. | \[\frac{\lambda }{{{\mu }^{2}}(\mu -\lambda )}\] |
| Answer» B. \[\frac{\lambda }{\mu -\lambda }\] | |
| 339. |
A machine of 100 kg mass has a 20 kg rotor with 0.5 mm eccentricity. The mounting springs have stiffness 85 kN/m and damping is negligible. If the operating speed is \[20\pi \] rad/and the unit is constrained to move vertically, the dynamic amplitude of the machine will be: |
| A. | \[0.170\times {{10}^{-\,4}}m\] |
| B. | \[1.000\times {{10}^{-\,4}}m\] |
| C. | \[1.274\times {{10}^{-\,4}}m\] |
| D. | \[2.540\times {{10}^{-\,4}}m\] |
| Answer» D. \[2.540\times {{10}^{-\,4}}m\] | |
| 340. |
Match the List I(Force transmissibility) with List II (frequency ratio) and select the correct answer using the codes given below the Lists: List-I (Force transmissibility) List-II (Frequency ratio) A. 1 1. \[\frac{\omega }{{{\omega }_{n}}}>\sqrt{2}\] B. Less than 1 2. \[\frac{\omega }{{{\omega }_{n}}}=\sqrt{2}\] C. Greater than 1 3. \[\frac{\omega }{{{\omega }_{n}}}>>\sqrt{2}\] D. Tending to zero 4. \[\frac{\omega }{{{\omega }_{n}}} |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| B. | A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| C. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| D. | A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 |
| Answer» C. A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 | |
| 341. |
If a beam is subjected to a constant bending moment along its length, then the shear force will: |
| A. | Also have a constant value everywhere along its length |
| B. | Be zero at all sections along the beam |
| C. | Be maximum at the centre and zero at the ends |
| D. | Zero at the centre and maximum at the ends |
| Answer» C. Be maximum at the centre and zero at the ends | |
| 342. |
Irrotational flow occurs when: |
| A. | Flow takes place in a duct of uniform cross- section at constant mass flow rate |
| B. | Streamlines are curved |
| C. | There is no net rotation of the fluid element about its mass center. |
| D. | Fluid element does not undergo any change in size or shape. |
| Answer» D. Fluid element does not undergo any change in size or shape. | |
| 343. |
Consider the following statements: Blowdown is necessary on boilers, because 1. The boiler water level is lowered rapidly in case it accidentally rises too high. 2. The precipitated sediment or sludge is removed while the boiler is in service. 3. The concentration of suspended solids in the boiler is controlled. Of these statements: |
| A. | 1, 2 and 3 are correct |
| B. | 1 and 2 are correct |
| C. | 3 alone is correct |
| D. | 1 and 3 are correct |
| Answer» D. 1 and 3 are correct | |
| 344. |
The silencer of an internal combustion engine: |
| A. | Reduces noise |
| B. | Decreases brake specific fuel consumption (BSFC) |
| C. | Increases BSFC |
| D. | Has no effect on its efficiency |
| Answer» B. Decreases brake specific fuel consumption (BSFC) | |
| 345. |
The difference between the comfort air-conditioning and industrial air-conditioning lies in the: |
| A. | Equipment used |
| B. | process adopted |
| C. | Indoor requirements |
| D. | ambient conditions |
| Answer» D. ambient conditions | |
| 346. |
Which of the following method(s) is/are adopted in the design of air duct system 1. Velocity reduction method 2. Equal friction method 3. Static regain method. Select the correct answer using the codes given below: Codes: |
| A. | 1 alone |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 347. |
For a single degree of freedom damped system, transmissibility is less than 1 if frequency ratio is: |
| A. | \[Equal\,\,to\,\,1\] |
| B. | <1 |
| C. | \[<\sqrt{2}\] |
| D. | \[>\sqrt{2}\] |
| Answer» E. | |
| 348. |
For a harmonically excited single degree of freedom viscous damped system, which one of the following is correct? |
| A. | Inertia force leads damping force by \[90{}^\circ \] while damping force leads spring force by\[90{}^\circ \]. |
| B. | Spring force leads damping force by \[90{}^\circ \] while damping force leads inertia force by\[180{}^\circ \]. |
| C. | Spring force and damping force are in phase, and inertia force leads them by \[90{}^\circ \] |
| D. | Spring force and inertia force are in phase, and damping force leads them by \[90{}^\circ \] |
| Answer» D. Spring force and inertia force are in phase, and damping force leads them by \[90{}^\circ \] | |
| 349. |
In a viscously damped vibratory system with harmonic excitation, if \[{{\omega }_{1}}\] and \[{{\omega }_{2}}\] are the half power points, \[{{\omega }_{n}}\] is the natural frequency and \[\zeta \] is the damping factor, which one of the following is correct? |
| A. | \[\frac{{{\omega }_{2}}-{{\omega }_{1}}}{{{\omega }_{n}}}\] |
| B. | \[\frac{{{\omega }_{2}}+{{\omega }_{1}}}{{{\omega }_{n}}}=\zeta \] |
| C. | \[\frac{{{\omega }_{2}}-{{\omega }_{1}}}{{{\omega }_{n}}}={{\zeta }^{2}}\] |
| D. | \[\frac{{{\omega }_{2}}-{{\omega }_{1}}}{{{\omega }_{n}}}=\zeta \] |
| Answer» B. \[\frac{{{\omega }_{2}}+{{\omega }_{1}}}{{{\omega }_{n}}}=\zeta \] | |
| 350. |
104. The desirable combination of properties of a refrigerant include : |
| A. | High specific heat and low specific volume |
| B. | High heat transfer coefficient and low latent heat |
| C. | High thermal conductivity and low specific volume |
| D. | High specific heat and high boiling point. |
| Answer» D. High specific heat and high boiling point. | |