MCQOPTIONS
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MCQOPTIONS
This section includes 760 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Fusible plug for boilers is made of fusible metal containing tin, lead, and |
| A. | ismuth |
| B. | opper |
| C. | luminium |
| D. | ickel |
| Answer» B. opper | |
| 152. |
A safety valve in a locomotive starts leaking. The leaking medium will be |
| A. | ater |
| B. | ry steam |
| C. | et steam |
| D. | uper heated steam |
| Answer» E. | |
| 153. |
Heating wet steam at constant temperature is heating it at constant |
| A. | olume |
| B. | ressure |
| C. | ntropy |
| D. | nthalpy |
| Answer» C. ntropy | |
| 154. |
The height of chimney in a power plant is governed by |
| A. | he draft to be created |
| B. | imitation of construction facilities |
| C. | ontrol of pollution |
| D. | uantity of flue gases to be handled |
| Answer» D. uantity of flue gases to be handled | |
| 155. |
The forced circulation of water does not take place in |
| A. | aMont boiler |
| B. | ancashire boiler |
| C. | elox boiler |
| D. | enson boiler |
| Answer» C. elox boiler | |
| 156. |
The pressure of reheat steam after passing through reheater compared to inlet condition is |
| A. | ore |
| B. | ess |
| C. | qual |
| D. | ay be more or less depending on capacity of reheater |
| Answer» C. qual | |
| 157. |
An ideal regenerative cycle is |
| A. | qual to Carnot cycle |
| B. | ess than Carnot cycle |
| C. | ore than Carnot cycle |
| D. | ould be anything |
| Answer» C. ore than Carnot cycle | |
| 158. |
Steam exhaust from high pressure turbine is reheated in |
| A. | oiler drums |
| B. | uperheater tubes |
| C. | conomizer |
| D. | separate coil located in convection path |
| Answer» E. | |
| 159. |
In case of non-condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the condenser pressure. |
| A. | qual to |
| B. | ower than |
| C. | igher than |
| D. | one of these |
| Answer» D. one of these | |
| 160. |
Clearance ratio is the ratio of |
| A. | learance volume to the swept volume |
| B. | learance volume to the volume at cut-off |
| C. | olume at cut-off to the swept volume |
| D. | wept volume to the clearance volume |
| Answer» B. learance volume to the volume at cut-off | |
| 161. |
Water at pressure of 4 kg/cm² and 160°C temperature when exposed to atmosphere will |
| A. | oil |
| B. | lash i.e. get converted into steam |
| C. | emain as it was |
| D. | ool down |
| Answer» C. emain as it was | |
| 162. |
The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages. |
| A. | ame |
| B. | ess |
| C. | ore |
| D. | one of these |
| Answer» D. one of these | |
| 163. |
The function of a valve rod is |
| A. | o provide reciprocating motion to the slide valve |
| B. | o convert reciprocating motion of the piston into rotary motion of the crank |
| C. | o convert rotary motion of the crankshaft into to and fro motion of the valve rod |
| D. | o provide simple harmonic motion to the D-slide valve |
| Answer» E. | |
| 164. |
The three "Ts" for good combustion are |
| A. | emperature, time, and turbulence |
| B. | otal air, true fuel, and turbulence |
| C. | horough mixing, total air and temperature |
| D. | otal air, time, and temperature |
| Answer» B. otal air, true fuel, and turbulence | |
| 165. |
The numbers of fire tubes in a Cochran boiler are |
| A. | 5 |
| B. | 15 |
| C. | 65 |
| D. | 25 |
| Answer» D. 25 | |
| 166. |
The water tubes in a simple vertical boiler are |
| A. | orizontal |
| B. | ertical |
| C. | nclined |
| D. | one of these |
| Answer» D. one of these | |
| 167. |
In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be |
| A. | .3 bar |
| B. | .46 bar |
| C. | .2 bar |
| D. | .9 bar |
| Answer» C. .2 bar | |
| 168. |
Size of boiler tubes is specified by |
| A. | ean diameter and thickness |
| B. | nside diameter and thickness |
| C. | utside diameter and thickness |
| D. | utside diameter and inside diameter |
| Answer» D. utside diameter and inside diameter | |
| 169. |
Caking coals are those which |
| A. | orm lumps or masses of coke |
| B. | urn freely |
| C. | how little or no fusing action |
| D. | urn completely |
| Answer» B. urn freely | |
| 170. |
A binary vapor plant consists of |
| A. | team turbine |
| B. | team condenser |
| C. | ercury boiler |
| D. | ll of these |
| Answer» E. | |
| 171. |
Reheating of steam under ideal conditions takes place at constant |
| A. | ntropy |
| B. | nthalpy |
| C. | ressure |
| D. | emperature |
| Answer» E. | |
| 172. |
The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become |
| A. | et |
| B. | uperheated |
| C. | emain dry saturated |
| D. | ry |
| Answer» B. uperheated | |
| 173. |
The dry saturated steam at very low pressure, (510 kg/cm²) when throttled to atmosphere will become |
| A. | et |
| B. | uperheated |
| C. | emain dry saturated |
| D. | ry |
| Answer» C. emain dry saturated | |
| 174. |
The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency) |
| A. | S = ηB × ηN |
| B. | S = ηB / ηN |
| C. | S = ηN / ηB |
| D. | one of these |
| Answer» B. S = ηB / ηN | |
| 175. |
The diameter of Cornish boiler is of the order of |
| A. | 2 m |
| B. | .52.5 m |
| C. | 3 m |
| D. | .53.5 m |
| Answer» B. .52.5 m | |
| 176. |
Thermal efficiency of a thermal power plant is of the order of |
| A. | 5 % |
| B. | 0 % |
| C. | 0 % |
| D. | 5 % |
| Answer» D. 5 % | |
| 177. |
The length of Cornish boiler is of the order of |
| A. | 4 m |
| B. | 5 m |
| C. | 7.5 m |
| D. | 9 m |
| Answer» D. 9 m | |
| 178. |
Primary air is the air used to |
| A. | rovide air around burners for obtaining optimum combustion |
| B. | ransport and dry the coal |
| C. | onvert CO (formed in lower zone of furnace) into CO₂ at higher zone |
| D. | ir delivered by forced draft fan |
| Answer» C. onvert CO (formed in lower zone of furnace) into CO₂ at higher zone | |
| 179. |
Tertiary air is the air used to |
| A. | rovide air around burners for obtaining optimum combustion |
| B. | ransport and dry the coal |
| C. | ool the scanners |
| D. | onvert CO (formed in lower zone of furnace) into CO₂ at higher zone |
| Answer» E. | |
| 180. |
The coal requirement per kW hour generation in the thermal power plant is of the order of |
| A. | .1 to 0.2 kg |
| B. | .2 to 0.4 kg |
| C. | .6 to 0.8 kg |
| D. | .0 to 1.5 kg |
| Answer» D. .0 to 1.5 kg | |
| 181. |
In a nozzle, the effect of super-saturation is to |
| A. | ecrease dryness fraction of steam |
| B. | ecrease specific volume of steam |
| C. | ncrease the entropy |
| D. | ncrease the heat drop |
| Answer» D. ncrease the heat drop | |
| 182. |
The critical pressure at which latent heat of vaporisation is zero is |
| A. | 25.65 kgf/ cm² |
| B. | 73 kgf/ cm² |
| C. | 00 kgf/ cm² |
| D. | kgf/ cm² |
| Answer» B. 73 kgf/ cm² | |
| 183. |
The ratio of brake power to the indicated power is known as |
| A. | echanical efficiency |
| B. | verall efficiency |
| C. | ndicated thermal efficiency |
| D. | rake thermal efficiency |
| Answer» B. verall efficiency | |
| 184. |
The effect of friction in the nozzle __________ dryness fraction of steam. |
| A. | as no effect on |
| B. | ecreases |
| C. | ncreases |
| D. | one of these |
| Answer» D. one of these | |
| 185. |
Equivalent evaporation of water is the evaporation for a feed water supply at 100°C |
| A. | nd its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm² |
| B. | nd its corresponding conversion into dry steam at desired boiler pressure |
| C. | onversion into steam at atmospheric condition |
| D. | onversion into steam at the same pressure at which feed water is supplied |
| Answer» B. nd its corresponding conversion into dry steam at desired boiler pressure | |
| 186. |
It is required to produce large amount of steam at low pressure. Which boiler should be used? |
| A. | ulverized fuel fired boiler |
| B. | ochran boiler |
| C. | ancashire boiler |
| D. | abcock and Wilcox boiler |
| Answer» D. abcock and Wilcox boiler | |
| 187. |
A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as |
| A. | team condenser |
| B. | team boiler |
| C. | team preheater |
| D. | conomiser |
| Answer» B. team boiler | |
| 188. |
Sulphur content of fuels is very important to the plant operators because it |
| A. | as high heating value |
| B. | etards electric precipitation |
| C. | romotes complete combustion |
| D. | as highly corrosive effect |
| Answer» E. | |
| 189. |
The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase |
| A. | ncreases |
| B. | ecreases |
| C. | emains unchanged |
| D. | ncreases/decreases depending on steam temperature requirements |
| Answer» C. emains unchanged | |
| 190. |
Water tube boilers are those in which |
| A. | lue gases pass through tubes and water around it |
| B. | ater passes through the tubes and flue gases around it |
| C. | ork is done during adiabatic expansion |
| D. | hange in enthalpy |
| Answer» D. hange in enthalpy | |
| 191. |
Boilers, Engines, Nozzles and Turbines Objective Questions and Answers pdf:- 101. The difference between cornish boiler and lancashire boiler is that |
| A. | ormer is fire tube type and latter is water tube type boiler |
| B. | ormer is water tube type and latter is fire tube type |
| C. | ormer contains one fire tube and latter contains two fire tubes |
| D. | one of the above |
| Answer» D. one of the above | |
| 192. |
The difference between Cornish boiler and Lancashire boiler is that |
| A. | ormer is fire tube type and latter is water tube type boiler |
| B. | ormer is water tube type and latter is fire tube type |
| C. | ormer contains one fire tube and latter contains two fire tubes |
| D. | one of the above |
| Answer» D. one of the above | |
| 193. |
In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder. |
| A. | qual to |
| B. | ess than |
| C. | ore than |
| D. | one of these |
| Answer» C. ore than | |
| 194. |
The latent heat of steam with increase of pressure |
| A. | emain same |
| B. | ncreases |
| C. | ecreases |
| D. | ehaves unpredictably |
| Answer» D. ehaves unpredictably | |
| 195. |
The increase in pressure |
| A. | owers the boiling point of a liquid |
| B. | aises the boiling point of a liquid |
| C. | oes not affects the boiling point of a liquid |
| D. | educes its volume |
| Answer» C. oes not affects the boiling point of a liquid | |
| 196. |
The saturation temperature of steam with increase in pressure increases |
| A. | inearly |
| B. | apidly first and then slowly |
| C. | lowly first and then rapidly |
| D. | nversely |
| Answer» C. lowly first and then rapidly | |
| 197. |
The specific volume of steam with increase in pressure decreases |
| A. | inearly |
| B. | lowly first and then rapidly |
| C. | apidly first and then slowly |
| D. | nversely |
| Answer» D. nversely | |
| 198. |
In a Woolf type compound engine, the high pressure and low pressure cylinders |
| A. | ave common piston rod |
| B. | re set at 90° |
| C. | ave separate piston rod |
| D. | re set in V arrangement |
| Answer» D. re set in V arrangement | |
| 199. |
In a receiver type compound engine, the high pressure and low pressure cylinders |
| A. | ave common piston rod |
| B. | re set at 90° |
| C. | ave separate piston rods |
| D. | re set in V-arrangement |
| Answer» D. re set in V-arrangement | |
| 200. |
The crown of the fire box is made hemispherical in order to |
| A. | ive maximum space |
| B. | ive maximum strength |
| C. | ithstand pressure inside boiler |
| D. | esist intense heat in fire box |
| Answer» E. | |