⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs371
A fusible plug is fitted in small boilers in order to ___________________?
Aavoid excessive build up of pressure
Bavoid explosion
Cextinguish fire if water level in the boiler falls below alarming limit
Dcontrol steam dome E. remove molten aslj
372
Thermal efficiency of well maintained boiler will be of the order___________________?
A20%
B40%
C50%
D75% E. 90%
373
The ratio of heat utilised to produce steam and the heat liberated in furnace is known as___________________?
Aboiler effectiveness
Bboiler evaporative capacity
Cfactor of evaporation
Dequivalent evaporation E. boiler efficiency
374
Boiler H.P. is defined as the ________________ ?
Asteam evaporation rate per kg of fuel fired
Bwork done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam
Cthe evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam
Dwork done by 1 kg of steam at saturation condition E. heat consumed in evaporating 1 kg water at 0°C to steam at 100°C and 1.033 kg/cm pressure
375
The fusible plug in small boilers is located ________________?
Ain the drum
Bin the fire tubes
Cabove steam dome
Dover the combustion chamber E. at the inlet of chimney
376
The number of drums in Benson steam generator is_________________?
Aone
Btwo
Cone steam drum and one water drum
Dno drum E. none of the above
377
If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by___________________?
Athrottling calorimeter
Bseparating calorimeter
Ccombined separating and throttling calorimeter
Dbucket calorimeter E. none of the above
378
The difference between cornish boiler and lancashire boiler is that_________________?
Aformer is fire tube type and latter is water tube type boiler
Bformer is water tube type and latter is fire tube type
Cformer contains one fire tube and latter contains two fire tubes E. none/of the above
379
On Mollier chart, flow through turbine is represented by ________________?
Ahorizontal straight line
Bvertical straight line
Cstraight inclined line
Dcurved line E. none of the above
380
In forced recirculation type boiler__________________?
Aheating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Bwater is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Cfeed pump is employed to supplement natural circulation in water wall type furnace
Dwater is converted into steam in one pass without any recirculation E. heating of water takes place in stages