MCQOPTIONS
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MCQOPTIONS
This section includes 187 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The draught which a chimney produces is called |
| A. | nduced draught |
| B. | atural draught |
| C. | orced draught |
| D. | alanced draught |
| Answer» C. orced draught | |
| 2. |
The efficiency of a modern boiler using coal and heat recovery equipment is about |
| A. | 5 to 30% |
| B. | 0 to 50% |
| C. | 5 to 70% |
| D. | 5 to 90% |
| Answer» E. | |
| 3. |
The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation. |
| A. | v = C |
| B. | v1A = C |
| C. | v1i = C |
| D. | v |
| Answer» E. | |
| 4. |
Underfeed stokers work best for __________ coals high in volatile matter and with caking tendency |
| A. | nthracite |
| B. | ignite |
| C. | emi-bituminous and bituminous |
| D. | ll of the above |
| Answer» D. ll of the above | |
| 5. |
Reheat cycle in steam power plant is used to |
| A. | tilise heat of flue gases |
| B. | ncrease thermal efficiency |
| C. | mprove condenser performance |
| D. | educe loss of heat |
| Answer» C. mprove condenser performance | |
| 6. |
In a regenerative surface condenser |
| A. | here is one pump to remove air and condensate |
| B. | here are two pumps to remove air and condensate |
| C. | here are three pumps to remove air, vapor and condensate |
| D. | here is no pump; the condensate gets removed by gravity |
| Answer» C. here are three pumps to remove air, vapor and condensate | |
| 7. |
The draught produced, for a given height of the chimney and given mean temperature of chimney gases |
| A. | ecreases with increase in outside air temperature |
| B. | ncreases with increase in outside air temperature |
| C. | emains the same irrespective of outside air temperature |
| D. | ay increase or decrease with increase in outside air temperature |
| Answer» B. ncreases with increase in outside air temperature | |
| 8. |
For the safety of a steam boiler the number of safety valves fitted are |
| A. | our |
| B. | hree |
| C. | wo |
| D. | ne |
| Answer» D. ne | |
| 9. |
For the induced draught the fan is located |
| A. | ear bottom of chimney |
| B. | ear bottom of furnace |
| C. | t the top of the chimney |
| D. | nywhere permissible |
| Answer» B. ear bottom of furnace | |
| 10. |
Carnot cycle comprises of |
| A. | wo isentropic processes and two constant volume processes |
| B. | wo isentropic processes and two constant pressure processes |
| C. | wo isothermal processes and three constant pressure processes |
| D. | one of the above |
| Answer» C. wo isothermal processes and three constant pressure processes | |
| 11. |
The effect of considering friction in steam nozzles for the same pressure ratio leads to |
| A. | ncrease in dryness fraction of exit steam |
| B. | ecrease in dryness fraction of exit steam |
| C. | o change in the quality of exit steam |
| D. | ecrease or increase of dryness fraction of exit steam depending upon inlet quality |
| Answer» B. ecrease in dryness fraction of exit steam | |
| 12. |
The effect of considering friction losses in steam nozzle for the same pressure ratio leads to |
| A. | ncrease in exit velocity from the nozzle |
| B. | ecrease in exit velocity from the nozzle |
| C. | o change in exit velocity from the nozzle |
| D. | ncrease or decrease depending upon the exit quality of steam |
| Answer» C. o change in exit velocity from the nozzle | |
| 13. |
The value of the reheat factor is of the order of |
| A. | .8 to 1.0 |
| B. | .0 to 1.05 |
| C. | .1 to 1.5 |
| D. | bove 1.5 |
| Answer» D. bove 1.5 | |
| 14. |
Binary vapor cycles are used to |
| A. | ncrease the performance of the condenser |
| B. | ncrease the efficiency of the plant |
| C. | ncrease efficiency of the turbine |
| D. | one of the above |
| Answer» C. ncrease efficiency of the turbine | |
| 15. |
The pressure at the furnace is minimum in case of |
| A. | orced draught system |
| B. | nduced draught system |
| C. | alanced draught system |
| D. | atural draught system |
| Answer» D. atural draught system | |
| 16. |
Steam pressure in a steam power station, which is usually kept now-a-days is of the order of |
| A. | 0 kgf/cm² |
| B. | 0 kgf/cm² |
| C. | 0 kgf/cm² |
| D. | 00 kgf/cm² |
| Answer» E. | |
| 17. |
In coal preparation plant, magnetic separators are used to remove |
| A. | ust |
| B. | linkers |
| C. | ron particles |
| D. | and |
| Answer» D. and | |
| 18. |
Example of overfeed type stoker is |
| A. | hain grate |
| B. | preader |
| C. | ravelling grate |
| D. | ll of the above |
| Answer» E. | |
| 19. |
Pipes carrying steam are generally made up of |
| A. | teel |
| B. | ast iron |
| C. | opper |
| D. | luminium |
| Answer» B. ast iron | |
| 20. |
The maximum length of a screw conveyer is about |
| A. | 0 metres |
| B. | 0 metres |
| C. | 0 metres |
| D. | 00 metres |
| Answer» B. 0 metres | |
| 21. |
Bucket elevators are used for |
| A. | arrying coal in horizontal direction |
| B. | arrying coal in vertical direction |
| C. | arrying coal in any direction |
| D. | one of the above |
| Answer» C. arrying coal in any direction | |
| 22. |
The percentage 02 by volume in atmosphere air is |
| A. | 1% |
| B. | 3% |
| C. | 7% |
| D. | 9% |
| Answer» B. 3% | |
| 23. |
The draught in locomotive boilers is produced by |
| A. | orced fan |
| B. | himney |
| C. | team jet |
| D. | nly motion of locomotive |
| Answer» D. nly motion of locomotive | |
| 24. |
The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is |
| A. | 0.555 |
| B. | 0.578 |
| C. | 0.5457 |
| D. | 0.6 |
| Answer» D. 0.6 | |
| 25. |
The overall efficiency of thermal power plant is equal to |
| A. | ankine cycle efficiency |
| B. | arnot cycle efficiency |
| C. | egenerative cycle efficiency |
| D. | oiler efficiency x turbine efficiency x generator efficiency |
| Answer» D. oiler efficiency x turbine efficiency x generator efficiency | |
| 26. |
For Parson's reaction steam turbine, degree of reaction is |
| A. | 5% |
| B. | 00% |
| C. | 0% |
| D. | 0% |
| Answer» D. 0% | |
| 27. |
Edward?s air pump |
| A. | emoves air and also vapour from condenser |
| B. | emoves only air from condenser |
| C. | emoves only un-condensed vapour from condenser |
| D. | emoves air alongwith vapour and also the condensed water from condenser |
| Answer» E. | |
| 28. |
Deaerative heating is done to |
| A. | eat the water |
| B. | eat the air in the water |
| C. | emove dissolved gases in the water |
| D. | one of these |
| Answer» D. one of these | |
| 29. |
The main source of production of biogas is |
| A. | uman waste |
| B. | et cow dung |
| C. | et livestock waste |
| D. | ll above |
| Answer» E. | |
| 30. |
In regenerative cycle feed water is heated by |
| A. | xhaust gases |
| B. | eaters |
| C. | raining steam from the turbine |
| D. | ll above |
| Answer» D. ll above | |
| 31. |
Mercury is a choice with steam in binary vapour cycle because it has |
| A. | igher critical temperature and pressure |
| B. | igher saturation temperature than other fluids |
| C. | elatively low vapourisation pressure |
| D. | ll above |
| Answer» E. | |
| 32. |
Curtis turbine is |
| A. | eaction steam turbine |
| B. | ressure velocity compounded steam turbine |
| C. | ressure compounded impulse steam turbine |
| D. | elocity compounded impulse steam turbine |
| Answer» C. ressure compounded impulse steam turbine | |
| 33. |
Economisers improve boiler efficiency by |
| A. | to 5% |
| B. | to 10% |
| C. | 0 to 12% |
| D. | to 12% |
| Answer» C. 0 to 12% | |
| 34. |
In a shell and tube surface condenser |
| A. | team and cooling water mix to give the condensate |
| B. | ooling water passes through the tubes and steam surrounds them |
| C. | team passes through the cooling tubes and cooling water surrounds them |
| D. | ll of the above varying with situation |
| Answer» C. team passes through the cooling tubes and cooling water surrounds them | |
| 35. |
Artificial draught is produced by |
| A. | nduced fan |
| B. | orced fan |
| C. | nduced and forced fan |
| D. | ll of the above |
| Answer» E. | |
| 36. |
Compounding of steam turbine is done for |
| A. | educing the work done |
| B. | ncreasing the rotor speed |
| C. | educing the rotor speed |
| D. | alancing the turbine |
| Answer» D. alancing the turbine | |
| 37. |
In ______ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners |
| A. | nit |
| B. | entral |
| C. | ower |
| D. | one of the above |
| Answer» C. ower | |
| 38. |
India's first nuclear power plant was installed at |
| A. | arapore |
| B. | ota |
| C. | alpakkam |
| D. | one of the above |
| Answer» B. ota | |
| 39. |
Steam turbines commonly used in steam power station are |
| A. | ondensing type |
| B. | on-condensing type |
| C. | oth (A) and (B) |
| D. | one of the above |
| Answer» B. on-condensing type | |
| 40. |
Primary air is that air which is used to |
| A. | educe the flame length |
| B. | ncrease the flame length |
| C. | ransport and dry the coal |
| D. | rovide air around burners for getting optimum combustion |
| Answer» D. rovide air around burners for getting optimum combustion | |
| 41. |
The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation |
| A. | vls=C |
| B. | v1126 = C |
| C. | v1A = C |
| D. | v = C |
| Answer» B. v1126 = C | |
| 42. |
The commercial sources of energy are |
| A. | olar, wind and biomass |
| B. | ossil fuels, hydropower and nuclear energy |
| C. | ood, animal wastes and agriculture wastes |
| D. | one of the above |
| Answer» C. ood, animal wastes and agriculture wastes | |
| 43. |
For the same draught produced the power of induced draught fan as compared to forced draught fan is |
| A. | ess |
| B. | ore |
| C. | ame |
| D. | ot predictable |
| Answer» C. ame | |
| 44. |
In a steam power plant, the function of a condenser is |
| A. | o maintain pressure below atmospheric to increase work output from the primemover |
| B. | o receive large volumes of steam exhausted from steam prime mover |
| C. | o condense large volumes of steam to water which may be used again in boiler |
| D. | ll of the above |
| Answer» E. | |
| 45. |
TravelUng grate stoker can burn coals at the rates of |
| A. | 0 - 75 kg/m per hour |
| B. | 5 - 100 kg/m per hour |
| C. | 00— -kg/m per hour |
| D. | 50 - 200 kg/m² per hour |
| Answer» E. | |
| 46. |
In fuel cell, the ______ energy is converted into electrical energy. |
| A. | echanical |
| B. | hemical |
| C. | eat |
| D. | ound |
| Answer» C. eat | |
| 47. |
The critical pressure ratio of a convergent nozzle is defined as |
| A. | he ratio of outlet pressure to inlet pressure of nozzle |
| B. | he ratio of inlet pressure to outlet pressure of nozzle |
| C. | he ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is min-imum |
| D. | he ratio of outlet pressure to inlet pressure only when mass flow rate = c |
| Answer» E. | |
| 48. |
The efficiency of chimney is approximately |
| A. | 0% |
| B. | 0% |
| C. | 0% |
| D. | .25% |
| Answer» E. | |
| 49. |
The capacity of large turbo-generators varies from |
| A. | 0 to 100 MW |
| B. | 0 to 300 MW |
| C. | 0 to 400 MW |
| D. | 00 to 650 MW |
| Answer» C. 0 to 400 MW | |
| 50. |
The modern steam turbines are |
| A. | mpulse turbines |
| B. | eaction turbines |
| C. | mpulse-reaction turbines |
| D. | one of the above |
| Answer» D. one of the above | |