MCQOPTIONS
Saved Bookmarks
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.
| 701. |
In modem steam plants using pulverized fuel firing, the flue gases: |
| A. | First pass through air preheaters and then through economizer |
| B. | First pass through economizer and then through air preheaters |
| C. | Pass simultaneously through air preheaters and economizer which are connected in parallel |
| D. | Pass through economizer only. |
| Answer» C. Pass simultaneously through air preheaters and economizer which are connected in parallel | |
| 702. |
The most efficient ideal regenerative steam power cycle is: |
| A. | Rankine cycle |
| B. | Carnot cycle |
| C. | Brayton cycle |
| D. | Joule cycle |
| Answer» C. Brayton cycle | |
| 703. |
Maximum blade efficiency of a Parson's turbine is given by: (\[\alpha \] is nozzle angle) |
| A. | \[\frac{{{\cos }^{2}}\alpha }{1+2{{\cos }^{2}}\alpha }\] |
| B. | \[\frac{\cos \alpha }{1+2{{\cos }^{2}}\alpha }\] |
| C. | \[\frac{2{{\sin }^{2}}\alpha }{1+2{{\sin }^{2}}\alpha }\] |
| D. | \[\frac{2{{\cos }^{2}}\alpha }{1+2{{\cos }^{2}}\alpha }\] |
| Answer» E. | |
| 704. |
Ratio of enthalpy drop in moving blades to the total enthalpy drop in the fixed and moving blades is called: |
| A. | Reheat factor |
| B. | Blade efficiency |
| C. | Degree of reaction |
| D. | internal efficiency |
| Answer» D. internal efficiency | |
| 705. |
The half-life of radioactive radon is 3.8 days. The time at the end of which l/20th of the Radon sample will remain undecayed will be: |
| A. | 3.8 days |
| B. | 16.5 days |
| C. | 33 days |
| D. | 76 days |
| Answer» C. 33 days | |
| 706. |
A nozzle is discharging steam through critical pressure ratio. When the back pressure is further decreased, the nozzle flow rate will: |
| A. | Decrease |
| B. | Increase |
| C. | Remain unaltered |
| D. | First increase to maximum and then will decrease |
| Answer» D. First increase to maximum and then will decrease | |
| 707. |
Consider the following statements: A tube, with the section diverging in the direction of flow, can be used as 1. Supersonic nozzle 2. Subsonic nozzle 3. Supersonic diffuser 4. Subsonic diffuser Select the correct answer using the codes given below: |
| A. | 1 alone |
| B. | 3 alone |
| C. | 1 and 4 |
| D. | 2 and 3 |
| Answer» D. 2 and 3 | |
| 708. |
The function of an economizer in a steam power plant is to: |
| A. | Increase the temperature of air supplied to a boiler |
| B. | Increase the enthalpy of feed water |
| C. | Condense the exhaust steam from the turbine |
| D. | Heat the fuel before combustion. |
| Answer» C. Condense the exhaust steam from the turbine | |
| 709. |
Match List-I (Equipments) with List-II (Types) and select the correct answer using the codes given below the lists: List-I List-II A. Steam trap 1. Fire tube type B. Water-level indicator 2. Boiler mounting C. Cornish boiler 3. Drumless type D. Benson boiler 4. Boiler accessory 5. Indirectly heated Codes: |
| A. | A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]5 |
| B. | A\[\to \]2, B\[\to \]4, C\[\to \]5, D\[\to \]3 |
| C. | A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]5 |
| D. | A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3 |
| Answer» E. | |
| 710. |
There is no steam drum in: |
| A. | La Mont boiler |
| B. | Loeffler boiler |
| C. | Benson boiler |
| D. | Velox boiler |
| Answer» D. Velox boiler | |
| 711. |
Amount of oxygen needed to completely bum 1 kg of methane \[(C{{H}_{4}})\] is: |
| A. | 2 kg |
| B. | 4 kg |
| C. | 16 kg |
| D. | 22 kg |
| Answer» B. 4 kg | |
| 712. |
A nucleus \[_{92}{{A}^{235}}\] emits alpha and beta particle and is converted to the nucleus \[_{82}Bu.\] the total number of alpha and beta particles emitted in the reaction is 11. Their respective numbers are: |
| A. | 5 and 6 |
| B. | 7 and 4 |
| C. | 4 and 7 |
| D. | 6 and 5 |
| Answer» C. 4 and 7 | |
| 713. |
Dryness fraction of steam means the mass ratio of: |
| A. | Wet steam to dry steam |
| B. | Dry steam to water particles in steam |
| C. | Water particles to total steam |
| D. | Dry steam to total steam. |
| Answer» E. | |
| 714. |
Consider the following statements: Steam turbines are suitable for use as prime movers for large steam power plants because 1. A single steam turbine can be designed for a capacity of 1000 MW or more 2. Much higher speed may he possible as compared to a reciprocating engine 3. They are more compact when compared to a gas turbine power plant 4. The maintenance cost and running cost may not increase with years of service. Which of these statements are correct? |
| A. | 1, 2 and 3 |
| B. | 2, 3 and 4 |
| C. | 1, 2 and 4 |
| D. | 1, 3 and 4 |
| Answer» D. 1, 3 and 4 | |
| 715. |
Consider the following statements: The erosion of steam turbine blades increases with the increase of 1. Moisture in the steam 2. Blade speed Which of these statement (s) is/are correct? |
| A. | 1 alone |
| B. | 2 alone |
| C. | 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» D. Neither 1 nor 2 | |
| 716. |
Large temperature rise of boiler feed water in the economiser should be avoided because: |
| A. | The economiser efficiency will reduce |
| B. | The overall steam generator efficiency will reduce |
| C. | Effectiveness of regenerator will he lower |
| D. | Flue gas will cool to dew point |
| Answer» D. Flue gas will cool to dew point | |
| 717. |
Governing of steam turbines can be done by the following: 1. Nozzle control 2. Throttle control 3. Providing additional valve and passage The correct answer will be: |
| 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 | |
| 718. |
When the water level in the boiler falls to an unsafe limit, safety is ensured by the: |
| A. | Stop valve |
| B. | Safety valve |
| C. | Fusible valve |
| D. | blow-off cock |
| Answer» D. blow-off cock | |
| 719. |
In a steam turbine, the enthalpy drops in the fixed blade and moving blade are 48 kJ and 32 kJ respectively. The degree of reaction is: |
| A. | 40% |
| B. | 0.55 |
| C. | 60% |
| D. | 0.666 |
| Answer» D. 0.666 | |
| 720. |
Steam enters a diffuser at Mach number 2.5 and exits at Mach number 1.8. The shape of the diffuser is: |
| A. | Divergent |
| B. | Convergent |
| C. | Convergent - divergent |
| D. | Divergent - convergent |
| Answer» B. Convergent | |
| 721. |
Inside a large power boiler, the flue gas pressure will be above the atmospheric pressure: |
| A. | At the furnace |
| B. | nearsuperheater region |
| C. | At the base of the chimney |
| D. | After the forced draught fan |
| Answer» E. | |
| 722. |
Consider the following accessories: 1. Superheater 2. Air pre-heater 3. Economizer The correct sequence of the position of these accessories along the flow of flue gas in a steam power plant is: |
| A. | 3, 1, 2 |
| B. | 1, 2, 3 |
| C. | 1, 3, 2 |
| D. | 2, 1, 3 |
| Answer» D. 2, 1, 3 | |
| 723. |
The circulation ratio for once through steam generators is: |
| A. | 1 |
| B. | 2 |
| C. | 2.5 |
| D. | 5 |
| Answer» B. 2 | |
| 724. |
Consider the following statements regarding an impulse turbine: 1. Relative velocity at the inlet and exit of the rotor blades are the same. 2. Absolute velocity at the inlet and exit of the rotor blades are the same. . 3. Static pressure within the rotor blade channel is constant. 4. Total pressure within the blade channel is constant. Of these statements |
| A. | 1 and 4 are correct |
| B. | 2 and 3 are correct |
| C. | 1 and 3 are correct |
| D. | 2 and 4 are correct |
| Answer» B. 2 and 3 are correct | |
| 725. |
A throttle governed steam develops 201. H.P. with 281 kg/hr of steam and 50 IHP with 521 kg/hr of steam. The steam consumption in kg/hr when developing 15 IHP will be nearly: |
| A. | 150 kg/hr |
| B. | 156 kg/hr |
| C. | 241 kg/hr |
| D. | 290 kg/hr |
| Answer» D. 290 kg/hr | |
| 726. |
Consider the following: 1. Safety valve 2. Fusible plug 3. Feed water pump 4. Pressure gauge The essential boiler mountings would include. |
| A. | 1, 3 and 4 |
| B. | 3 and 4 |
| C. | 1, 2 and 3 |
| D. | 1, 2 and 4 |
| Answer» E. | |
| 727. |
Match List-I (Component) with List-II (Properties) in the context of nuclear reactors and select the correct answer using the codes given below the lists: List-I List-II A. Coolant 1. Low neutron absorption B. Moderator 2. Low radiation damage C. Fuel 3. High heal transfer coefficient D. Shield 4. High absorption of radiation. Codes: |
| A. | A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 |
| B. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| C. | A\[\to \]1, B\[\to \]4, C\[\to \]4, D\[\to \]2 |
| D. | A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 |
| Answer» C. A\[\to \]1, B\[\to \]4, C\[\to \]4, D\[\to \]2 | |
| 728. |
Energy released by the fission of one U-235 atom is nearly: |
| A. | 2000 MeV |
| B. | 1000 MeV |
| C. | 200 MeV |
| D. | 20 MeV |
| Answer» D. 20 MeV | |
| 729. |
Consider the following statements: Uranium oxide is chosen as fuel element in the nuclear reactors, because Uranium oxide 1. is more stable than Uranium. 2. Does not corrode easily. 3. is more brittle. 4. has dimensional stability. Among these statements: |
| A. | 1, 2 and 4 are correct |
| B. | 1, 2 and 3 are correct |
| C. | 1, 2, 3 and 4 are correct |
| D. | 3 and 4 are correct |
| Answer» D. 3 and 4 are correct | |
| 730. |
Match List-I with List-II in respect of nuclear reactor and select the correct answer using the codes given below the lists: List-I List-II A. Poison 1. Hafnium B. Moderator 2. Graphite C. Cladding 3. Zirconium D. Fission Product 4. Strontium-90 Codes: |
| A. | A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| B. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| C. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| D. | A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 |
| Answer» D. A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 | |
| 731. |
External threads can be produced by: 1. Rolling 2. Grinding 3. Milling |
| A. | 1 and 3 only |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 732. |
Satellite is a non-ferrous cast alloy composed of: |
| A. | Cobalt, chromium and tungsten |
| B. | Tungsten, vanadium and chromium |
| C. | Molybdenum, tungsten and chromium |
| D. | Tungsten, molybdenum, chromium- vanadium |
| Answer» E. | |
| 733. |
The optimum cutting speed is one which should have: 1. High metal removal rate 2. High cutting tool life 3. Balance the metal removal rate and cutting tool life. |
| A. | 2 and 3 |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 3 only |
| Answer» E. | |
| 734. |
In the 3-2-1 principle of fixture design, 3 refers to number of: |
| A. | Set ups possible |
| B. | Clamps required |
| C. | Positions on primary face |
| D. | Locating positions |
| Answer» E. | |
| 735. |
In an ideal steam power cycle with the same inlet pressure, the low dryness fraction of steam in the last stage of expansion process can be avoided by: |
| A. | Providing regeneration |
| B. | Providing reheating |
| C. | Reducing the superheat |
| D. | Lowering the condenser pressure. |
| Answer» B. Providing reheating | |
| 736. |
Consider the following statements: 1. Actual mass flow rate of steam will be less than the theoretical value in all cases of flow through a nozzle 2. Mass flow of steam cannot be increased beyond a certain value in the case of flow through a nozzle. 3. Actual velocity of steam at the exit of a nozzle will always be less than the theoretical value. 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 4 are correct |
| Answer» B. 1 and 2 are correct | |
| 737. |
In high pressure water tube boilers, the tube bundles are: |
| A. | Hung from top girders |
| B. | Supported on brick walls |
| C. | Bolted on steel structures |
| D. | Firmly fixed on any structure |
| Answer» D. Firmly fixed on any structure | |
| 738. |
Which of the following statements are true about CANDU reactors? 1. Fuel elements contain natural-uranium dioxide 2. Pressurized heavy-water coolant is used 3. Horizontal pressure tube is used |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» B. 1 and 3 only | |
| 739. |
Entropy of a saturated liquid at \[227{}^\circ C\] is 2.6 kJ/kg K. Its latent heat of vaporization is 1800 kJ/kg: then the entropy of saturated vapor at \[227{}^\circ C\] would be: |
| A. | 2.88 kJ/kg K |
| B. | 6.2 kJ/kg K |
| C. | 7.93 kJ/kg K |
| D. | 10.53 kJ/kg K |
| Answer» C. 7.93 kJ/kg K | |
| 740. |
Consider the following statements: 1. In a steam power plan, the volume flow at the low pressure end is considerably reduced by bleeding. 2. Theoretically, the efficiency of a steam power plant increases with the increasing number of feed heaters but the gain is in diminishing return. 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» D. neither 1 nor 2 | |
| 741. |
Consider the following statements: 1. Reheating in a steam power plant leads to increased condenser requirement. 2 The efficiency of regenerative cycle in a steam power plan is maximum when the temperature of bled steam is equal to the geometric mean of the extreme temperatures of the primary flow cycle. 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» D. neither 1 nor 2 | |
| 742. |
Witch of the following we the advantages of surface condenser? 1. Less quantity of makeup water is required. 2. It is suitable for higher capacity plants. 3. Power requirements of circulating pump and air pump are much less. Select the correct answer using the code given below: |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 1 and 3 only |
| D. | 1, 2 and 3 |
| Answer» C. 1 and 3 only | |
| 743. |
Where is shock effect felt in a nozzle? |
| A. | Divergent portion |
| B. | Entrance |
| C. | Convergent portion |
| D. | Throat |
| Answer» B. Entrance | |
| 744. |
In a reaction turbine enthalpy drop per stage is 60 unit while the enthalpy drop in the moving blade is 32 unit. What is the degree of reaction? |
| A. | 0.28 |
| B. | 0.46 |
| C. | 0.53 |
| D. | 1.87 |
| Answer» B. 0.46 | |
| 745. |
For a steam jet angle of \[30{}^\circ \] (from the tangential direction) at the entrance, what is the maximum blade efficiency (approximate) of a Parson's turbine? |
| A. | 0.85 |
| B. | 0.49 |
| C. | 0.4 |
| D. | 0.3 |
| Answer» C. 0.4 | |
| 746. |
The enthalpy of steam entering a, turbine in a Rankine cycle is 3200 kJ/kg. The enthalpy after isentropic expansion is 2400 kJ/kg and the enthalpy at the end of actual expansion is 2560 kJ/kg. What is the turbine efficiency? |
| A. | 75% |
| B. | 0.8 |
| C. | 85% |
| D. | 0.9 |
| Answer» C. 85% | |
| 747. |
Consider the following statements: 1. Safety valve in boilers will operate as soon as the pressure reaches the rated value. 2. Two safety valves are provided for quick release of pressure. 3. Blow down valve is operated regularly to remove sediments if any. 4. Water level is monitored electrically in all large boilers Of these statements: |
| A. | 1 and 2 are correct |
| B. | 2 and 3 are correct |
| C. | 3 and 4 are correct |
| D. | 1 and 4 are correct |
| Answer» E. | |
| 748. |
Match the following List-I List-II A. Moderator 1. Graphite B. Control rod 2. Boron C. Poison 3. Concrete D. Shield Material 4. Hafmium Codes: |
| A. | A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2 |
| B. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| C. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| D. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| Answer» E. | |
| 749. |
In the bottoming cycle of cogeneration, low grade waste heat is used for: |
| A. | Processing |
| B. | power generation |
| C. | Feed water heating |
| D. | none of the above |
| Answer» C. Feed water heating | |
| 750. |
The main aim of compounding steam turbine is to: |
| A. | Improve efficiency |
| B. | Reduce steam consumption |
| C. | Reduce motor speed |
| D. | Reduce turbine size |
| Answer» D. Reduce turbine size | |