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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.
| 101. |
A cyclic heat engine receives 600 kJ of heat from a 1000 K source and rejects 450 kJ to a 300 K sink. The quantity \[\oint{\frac{\delta Q}{T}}\] and efficiency of the engine are respectively: |
| A. | 2.1 kJ/K and 70% |
| B. | \[-\,\,0.9\] kJ/K and 25% |
| C. | \[+\,\,0.9\] kJ/K and 70% |
| D. | \[-\,\,2.1\] kJ/K and 50% |
| Answer» C. \[+\,\,0.9\] kJ/K and 70% | |
| 102. |
Identify the process of change of a closed system in which the work transfer is maximum: |
| A. | Isothermal |
| B. | Isochoric |
| C. | Isentropic |
| D. | Polytropic |
| Answer» E. | |
| 103. |
Consider two queueing disciplines in a single server queue. Case 1 has a first come first served discipline and case 2 has a last come first served discipline. If the average waiting times in the two cases are \[{{W}_{1}}\] and \[{{W}_{2}}\] respectively, then which one of the following inferences would be true? |
| A. | \[{{W}_{1}}>{{W}_{2}}\] |
| B. | \[{{W}_{1}}<{{W}_{2}}\] |
| C. | \[{{W}_{1}}={{W}_{2}}\] |
| D. | Data insufficient to draw any tangible inference |
| Answer» C. \[{{W}_{1}}={{W}_{2}}\] | |
| 104. |
In a single server queue customers are served a at rate of u. If W and \[{{W}_{q}}\] represent the mean waiting time in the system and mean waiting time in the queue respectively, then W will be equal to? |
| A. | \[{{W}_{q}}-\mu \] |
| B. | \[{{W}_{q}}+\mu \] |
| C. | \[{{W}_{q}}+1/\mu ,\] |
| D. | \[{{W}_{q}}-1/\mu \] |
| Answer» D. \[{{W}_{q}}-1/\mu \] | |
| 105. |
Consider the following linear programming problem: Max, \[Z=2A+3B,\] Subject to \[A+B\le 10,\] \[4A+6B\le 30,\] \[2A+B\le 17,\] \[A,\,B\ge 0\] What can one say about the solution? |
| A. | It may contain alternative optima |
| B. | The solution will unbounded |
| C. | The solution will be degenerate |
| D. | It cannot be solved by simplex method |
| Answer» B. The solution will unbounded | |
| 106. |
A simply supported beam carrying a concentrated load W at mid-span deflects by \[{{\delta }_{1}}\] under the lode. If the same beam carries the load W such that it is distributed uniformly over entire length and undergoes a deflection \[{{\delta }_{2}}\] at the mid span. The ratio, \[{{\delta }_{1}}:{{\delta }_{2}}\] is: |
| A. | 2 : 1 |
| B. | \[\sqrt{2}:1\] |
| C. | 1.6 : 1 |
| D. | 0.0430555555555556 |
| Answer» D. 0.0430555555555556 | |
| 107. |
In the statement "an eccentric mass rotating a 3000 rpm will create X times more unbalanced force than 50% of the same mass rotating at 300 rpm", 'X' stands for: |
| A. | 10 |
| B. | 50 |
| C. | 100 |
| D. | 200 |
| Answer» E. | |
| 108. |
Which of the following statements about illumination is true? |
| A. | if the distance from me source doubles, the illumination becomes half |
| B. | if the distance from the source doubles, the illumination reduces to one fourth |
| C. | The greater the illumination, the better on sees |
| D. | The finer the work, the less the required illumination |
| Answer» C. The greater the illumination, the better on sees | |
| 109. |
If the controlling force of a governor increases within crease in speed, the governor is said to be |
| A. | sensitive |
| B. | insensitive |
| C. | isochronous |
| D. | powerful |
| Answer» E. | |
| 110. |
Consider the following statements: The cutter setting block in a milling fixture 1. Sets the cutting tool with respect to two of its surface 2. Limits the total travel required by the cutter during machining 3. Takes location from the location scheme of component. Out of these statements: |
| A. | 1, 2 and 3 are correct |
| B. | 1 and 2 are correct |
| C. | 2 and 3 are correct |
| D. | 1 and 3 are correct |
| Answer» C. 2 and 3 are correct | |
| 111. |
Given that m = mass of the ball of the governor, \[\omega \,\,=\] angular velocity of the governor and g = accelerate due to gravity, The height of Watt's governor is given by: |
| A. | \[\frac{g}{2{{\omega }^{2}}}\] |
| B. | \[\frac{g}{{{\omega }^{2}}}\] |
| C. | \[\frac{\sqrt{2g}}{{{\omega }^{2}}}\] |
| D. | \[\frac{g}{{{\omega }^{2}}}\] |
| Answer» C. \[\frac{\sqrt{2g}}{{{\omega }^{2}}}\] | |
| 112. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I List-II A. End thrust 1. Plain bearing B. No cage 2. Ball bearing C. More accurate centering 3. Needle bearing D. Can be overloade 4. Tapered roller bearing Codes: |
| A. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| B. | A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]2 |
| C. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| D. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| Answer» E. | |
| 113. |
Which of the following is/are the advantage (s) of numerical control of machine tools? 1. Reduced lead time 2. Consistently good quality 3. Elaborate fixtures are not required |
| A. | 2 and 3 |
| B. | 1 and 2 |
| C. | 1 alone |
| D. | 1 and 3 |
| Answer» C. 1 alone | |
| 114. |
The Mach number at inlet of gas turbine diffuser is 0.3. The shape of the diffuser would be: |
| A. | Converging |
| B. | diverging I |
| C. | Stagnation enthalpy |
| D. | stagnation pressure |
| Answer» C. Stagnation enthalpy | |
| 115. |
For two-stage compressor in which index of compression for low pressure stage is m and for high pressure stage is n. The load sharing with perfect intercooling is expressed as: |
| A. | \[\frac{{{W}_{1}}}{{{W}_{2}}}=\frac{m(n-1)}{n(m-1)}\] |
| B. | \[\frac{{{W}_{1}}}{{{W}_{2}}}=\frac{n(n-1)}{m(m-1)}\] |
| C. | \[\frac{{{W}_{1}}}{{{W}_{2}}}=\frac{n}{m}\] |
| D. | \[\frac{{{W}_{1}}}{{{W}_{2}}}=\frac{m}{n}\] |
| Answer» B. \[\frac{{{W}_{1}}}{{{W}_{2}}}=\frac{n(n-1)}{m(m-1)}\] | |
| 116. |
Forced draught fans of a large steam generator have: |
| A. | Backward curved blades |
| B. | Forward curved blades |
| C. | Straight or radial blades |
| D. | Double curved blades |
| Answer» B. Forward curved blades | |
| 117. |
What is the value of slope for an isothermal process on \[p\,-\,v\] diagram for an ideal gas? |
| A. | \[-\,\,p/v\] |
| B. | \[-\,\,v/p\] |
| C. | \[-1/(pv)\] |
| D. | \[-\,\,pv\] |
| Answer» B. \[-\,\,v/p\] | |
| 118. |
What is the molecular weight (approximate) for the gas whose specific heats are as follows? \[{{c}_{p}}=1.967\,\,kJ/kg\,\,K\,;\] \[{{c}_{v}}=1.507\,\,kJ/kg\,\,K\,\,\] |
| A. | 17 |
| B. | 18 |
| C. | 19 |
| D. | 20 |
| Answer» C. 19 | |
| 119. |
Consider the following statements: The maximum temperature produced by the combustion of a unit mass of fuel depends upon 1. L.C.V. 2. Ash content 3. Mass of air supplied 4. Pressure in the furnace Of these statements |
| A. | 1 alone is correct |
| B. | 1 and 3 are correct |
| C. | 2 and 4 are correct |
| D. | 3 and 4 are correct |
| Answer» C. 2 and 4 are correct | |
| 120. |
Match List-I (Thermodynamic system/prime mover) with List-II (Thermodynamic cycle) and select the correct answer using the codes given below the lists: List-I List-II A. Air liquefaction plant 1. Atkinson cycle B. Gas turbine with multistage compression and multistage expansion 2. Brayton cycle C. Free piston engine/compressor with a gas turbine 3. Ericsson cycle D. Pulse jet 4. Reversed Stirling cycle 5. Lenoir cycle Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 |
| B. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| C. | A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]5 |
| D. | A\[\to \]4, B\[\to \]3, C\[\to \]5, D\[\to \]1 |
| Answer» C. A\[\to \]4, B\[\to \]3, C\[\to \]1, D\[\to \]5 | |
| 121. |
The property by which an amount of energy is absorbed by a material without plastic deformation, is called: |
| A. | Toughness |
| B. | impact strength |
| C. | Ductility |
| D. | resilience |
| Answer» B. impact strength | |
| 122. |
In the assembly of pulley, key and shaft: |
| A. | Pulley is made the weakest |
| B. | Key is made the weakest |
| C. | Key is made the strongest |
| D. | All the three are designed for equal strength |
| Answer» C. Key is made the strongest | |
| 123. |
In air-conditioning design for summer months, the condition inside a factory where heavy work in performed as compared to a factory in which light work is performed should have: |
| A. | Lower dry bulb temperature and lower relative humidity |
| B. | Lower dry bulb temperature and higher relative humidity |
| C. | Lower dry bulb temperature and same relative humidity |
| D. | Same dry bulb temperature and same relative humidity. |
| Answer» E. | |
| 124. |
For low by pass factor a cooling coil, the fin spacing and the number of tube rows will be respectively: |
| A. | High and high |
| B. | High and low |
| C. | Low and high |
| D. | Low and low |
| Answer» D. Low and low | |
| 125. |
Consider the following statements: 1. In forced vibrations the body vibrates under the influence of an applied force. 2. In damped vibrations amplitude reduces over every cycle of vibration 3. In torsional vibrations the disc moves parallel to the axis of shaft. 4. in transverse vibrations the particles of the shaft moves approximately perpendicular to the axis of the shaft. Which of these statements are correct? |
| A. | 1, 2 and 3 |
| B. | 1, 3 and 4 |
| C. | 2, 3 and 4 |
| D. | 1, 2 and 4 |
| Answer» E. | |
| 126. |
Whirling speed of shaft is the speed at which: |
| A. | Shaft tends to vibrate in longitudinal direction |
| B. | Torsional vibrations occur |
| C. | Shaft tends to vibrate vigorously in transverse direction |
| D. | Combination of transverse and longitudinal vibration occurs. |
| Answer» D. Combination of transverse and longitudinal vibration occurs. | |
| 127. |
If the static temperature rise in the rotor and stator respectively are \[\Delta {{T}_{A}}\] and \[\Delta T,B\] then degree of reaction in an axial flow compressor is given by: |
| A. | \[\frac{\Delta {{T}_{A}}}{\Delta {{T}_{B}}}\] |
| B. | \[\frac{\Delta {{T}_{A}}}{\Delta {{T}_{A}}+\Delta {{T}_{B}}}\] |
| C. | \[\frac{\Delta {{T}_{B}}}{\Delta {{T}_{a}}+\Delta {{T}_{B}}}\] |
| D. | \[\frac{\Delta {{T}_{B}}}{\Delta {{T}_{A}}}\] |
| Answer» C. \[\frac{\Delta {{T}_{B}}}{\Delta {{T}_{a}}+\Delta {{T}_{B}}}\] | |
| 128. |
In a centrifugal compressor assuming the same overall dimensions, blade inlet angle and rotational speeds, which of the following bladings will give the maximum pressure rise? |
| A. | Forward curved blades |
| B. | Backward curved blades |
| C. | Radial blades |
| D. | All three types of bladings have the same pressure rise. |
| Answer» B. Backward curved blades | |
| 129. |
Under which one of the following sets of conditions will a supersonic compressor have the highest efficiency? |
| A. | Rotor inlet velocity is supersonic and exit velocity subsonic; stator inlet velocity is subsonic and exit velocity is subsonic. |
| B. | Rotor inlet velocity is supersonic and exit velocity subsonic; stator inlet velocity is supersonic and exit velocity is subsonic. |
| C. | Rotor inlet velocity is supersonic and exit velocity supersonic; stator inlet is supersonic and exit velocity is subsonic. |
| D. | Rotor inlet velocity is supersonic and exit velocity supersonic; stator inlet velocity is subsonic and exit velocity is Subsonic |
| Answer» D. Rotor inlet velocity is supersonic and exit velocity supersonic; stator inlet velocity is subsonic and exit velocity is Subsonic | |
| 130. |
Consider the following statements for an incompressible fluid flowing through a convergent-divergent duct: 1. The convergent part acts as a nozzle. 2. The divergent part acts as a diffuser. 3. The maximum limiting speed of the fluid is the sonic velocity. Which of these statements are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1 and 3 only |
| Answer» C. 2 and 3 only | |
| 131. |
A Bell-Coleman cycle is a reversed |
| A. | Carnot cycle |
| B. | Otto cycle |
| C. | Joule cycle |
| D. | Stirling cycle |
| Answer» D. Stirling cycle | |
| 132. |
A centrifugal compressor is suitable for which of the following? |
| A. | High pressure ratio, low mass flow |
| B. | Low pressure ratio, low mass flow |
| C. | High pressure ratio, high mass flow |
| D. | Low pressure ratio, high mass flow |
| Answer» E. | |
| 133. |
Given: \[{{\eta }_{s}}=\] Stage efficiency, \[{{\eta }_{n}}=\] Nozzle efficiency, \[{{\eta }_{s}}=\] Blade efficiency, Which one of the following is correct? |
| A. | \[{{\eta }_{n}}={{\eta }_{b}}={{\eta }_{s}}\] |
| B. | \[{{\eta }_{b}}={{\eta }_{s}}{{\eta }_{n}}\] |
| C. | \[{{\eta }_{s}}\times {{\eta }_{n}}\times {{\eta }_{s}}=1\] |
| D. | \[{{\eta }_{s}}={{\eta }_{s}}{{\eta }_{n}}\] |
| Answer» E. | |
| 134. |
Which one of the following types of impeller vanes are most commonly used in centrifugal type compressors? |
| A. | Forward curved |
| B. | Radial |
| C. | Backward curved |
| D. | Tangential |
| Answer» D. Tangential | |
| 135. |
Coulomb damping results from which one of the following? |
| A. | Dry friction between moving parts |
| B. | Drag between a moving body and the fluid environment |
| C. | Internal friction within a material |
| D. | Radiation of energy into the environmentl. |
| Answer» B. Drag between a moving body and the fluid environment | |
| 136. |
The mathematical conditions at the critical point for a pure substance would be: |
| A. | \[\frac{\partial p}{\partial v}<0\,;\,\,\frac{{{\partial }^{2}}p}{\partial {{v}^{2}}}=0\] and \[\frac{{{\partial }^{3}}p}{\partial {{v}^{3}}}=0\] |
| B. | \[\frac{\partial p}{\partial v}=0\,;\,\,\frac{{{\partial }^{2}}p}{\partial {{v}^{2}}}<0\] and \[\frac{{{\partial }^{3}}p}{\partial {{v}^{3}}}=0\] |
| C. | \[\frac{\partial p}{\partial v}=0\,;\,\,\frac{{{\partial }^{2}}p}{\partial {{v}^{2}}}=0\] and \[\frac{{{\partial }^{3}}p}{\partial {{v}^{3}}}<0\] |
| D. | \[\frac{\partial p}{\partial v}=0\,;\,\,\frac{{{\partial }^{2}}p}{\partial {{v}^{2}}}=0\] and \[\frac{{{\partial }^{3}}p}{\partial \,{{v}^{3}}}\,\,=\,\,0\] |
| Answer» C. \[\frac{\partial p}{\partial v}=0\,;\,\,\frac{{{\partial }^{2}}p}{\partial {{v}^{2}}}=0\] and \[\frac{{{\partial }^{3}}p}{\partial {{v}^{3}}}<0\] | |
| 137. |
During a process with heat and work interactions, the internal energy of a system increases by 30 kJ. The amounts of heat and work interactions are respectively: |
| A. | \[-\,\,50\]kJ and \[-\,\,80\]kJ |
| B. | \[-\,\,50\]kJ and 80 kJ |
| C. | 50 kJ and 80 kJ |
| D. | 50 kJ and \[-\,\,80\]kJ |
| Answer» B. \[-\,\,50\]kJ and 80 kJ | |
| 138. |
A uniform cantilever beam undergoes transverse vibrations. The number of natural frequencies associated with the beam is: |
| A. | 1 |
| B. | 10 |
| C. | 100 |
| D. | infinite |
| Answer» E. | |
| 139. |
The primary disturbing force due to inertia of reciprocating parts of mass m at radius r moving with an angular velocity \[\omega \] is given by: |
| A. | \[m{{\omega }^{2}}r\sin \theta \] |
| B. | \[m{{\omega }^{2}}r\cos \theta \] |
| C. | \[m{{\omega }^{2}}r\frac{\sin 2\theta }{n}\] |
| D. | \[m{{\omega }^{2}}r\frac{\cos 2\theta }{n}\] |
| Answer» C. \[m{{\omega }^{2}}r\frac{\sin 2\theta }{n}\] | |
| 140. |
Match List-I with List-II and select the correct answer using the codes given below the list: List-I List-II A. Linear programming 1. Ritchie B. Dynamic programming 2. Dantzig C. C programming 3. Bell D. Integer Programming 4. Gomory Codes: |
| A. | A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| B. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| C. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 |
| D. | A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 |
| Answer» D. A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 | |
| 141. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (O.K. technique) List-II (Application) A. Linear programming 1. Warehouse location decision B. Transportation 2. Machine allocation decision C. Assignment 3. Product mix decision D. Queuing theory 4. Project management 5. Number of servers decision Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]5 |
| B. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]5 |
| C. | A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]5 |
| D. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| Answer» C. A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]5 | |
| 142. |
The velocity of sound in an ideal gas does not depend on: |
| A. | The specific heat ratio of the gas |
| B. | The molecular weight of the gas |
| C. | The temperature of the gas |
| D. | The density of the gas |
| Answer» C. The temperature of the gas | |
| 143. |
An inventor claims that heat engine has the following specifications: Power developed = 50 kW, Fuel burned per hour = 3 kg Heating value of fuel = 75,000 kJ per kg Temperature limits = \[627{}^\circ C\] and \[27{}^\circ C\] Cost of fuel =Rs. 30/kg. Value of power = Rs. 5/kWh, The performance of his engine is: |
| A. | Possible |
| B. | not possible |
| C. | Economical |
| D. | uneconomical |
| Answer» C. Economical | |
| 144. |
A solid shaft of diameter 'D' caries a twisting moment that develops maximum shear stress \[\tau .\] If the shaft is replaced by a hollow one of outside diameter 'D' and inside diameter D/2, then the maximum shear stress |
| A. | \[1.067\,\tau \] |
| B. | \[1.143\,\tau \] |
| C. | \[1.333\,\tau \] |
| D. | \[2\,\tau \] |
| Answer» B. \[1.143\,\tau \] | |
| 145. |
A circular shaft can transmit a torque of 5 kNm. the torque is reduced to 4 kNm then the maximum value of bending moment that can be applied to the shaft is |
| A. | 1 kNm |
| B. | 2 kNm |
| C. | 3 kNm |
| D. | 4 kNm |
| Answer» D. 4 kNm | |
| 146. |
Match List-I with List-II and select the correct answer using the codes given below the lists. List-I List-II A. Governor 1. Pantograph device B. Automobile differential 2. Feed-back control C. Dynamic Absorber 3. Epicyelic train D. Engine Indicator 4. Two-mass oscillator Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| B. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| C. | A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 |
| D. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| Answer» D. A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 | |
| 147. |
Which one of the following sets of acceleration involved in the motion of the piston inside cylinder of a uniform rotating cylinder mechanism |
| A. | Coriolis and radial acceleration |
| B. | Radial and tangential acceleration |
| C. | Corioiis and gyroscopic acceleration |
| D. | Gyroscopic and tangential acceleration |
| Answer» E. | |
| 148. |
Consider the following statements: Coriolis component of acceleration depends on 1. Velocity of slider. 2. Angular velocity of the link. 3. Acceleration of slider. 4. Angular acceleration of link. Of these statements: |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 4 are correct |
| D. | 1 and 4 are correct |
| Answer» B. 1 and 3 are correct | |
| 149. |
For the expression \[\int{p\,\,dv}\] to represent the work, which of the following conditions should apply? |
| A. | The system is closed one and process takes place in non-flow system. |
| B. | The process is non-quasi-static. |
| C. | The boundary of the system should not move in order that work may be transferred. |
| D. | If the system is open one, it should be non- reversible |
| Answer» B. The process is non-quasi-static. | |
| 150. |
Variation of pressure and volume at constant temperature are correlated through: |
| A. | Charles' law |
| B. | Boyle's law |
| C. | Joule's law |
| D. | Gay Lussac's law |
| Answer» C. Joule's law | |