Explore topic-wise MCQs in Mechanical Engineering Questions.

This section includes 371 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

351.

Coke is produced by__________________?

A. pulverising coal in inert atmosphere
B. heating wood in a limited supply of air at temperatures below 300GC
C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
D. binding the pulverised coal into brick-etts
E. enriching carbon in the coal
Answer» D. binding the pulverised coal into brick-etts
Discussion
352.

Cochran boiler is a__________________?

A. horizontal fire-tube boiler
B. horizontal water-tube boiler
C. veritcal water-tube boiler
D. vertical fire tube boiler
E. forced circulating boiler
Answer» E. forced circulating boiler
Discussion
353.

Carbonation of coal is the process of________________________?

A. pulverising coal in inert atmosphere
B. heating wood in a limited supply of air at temperatures below 300°C
C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
D. binding the pulverised coal into brick-ettes
E. enriching carbon in the coal
Answer» D. binding the pulverised coal into brick-ettes
Discussion
354.

Calorific value of coal is of the order of _______________________?

A. 200-400 kcal/kg
B. 800-1200 kcal/kg
C. 2000-4000 kcal/kg
D. 5000-8000 kcal/kg
E. 8000-10,000 kcal/kg
Answer» D. 5000-8000 kcal/kg
Discussion
355.

Caking coals are those which __________________________?

A. form lumps or masses of coke
B. burn freely
C. show little or no fusing action
D. burn completely
E. do not form ash
Answer» B. burn freely
Discussion
356.

Bomb calorimeter is used to determine ___________________?

A. Higher calorific value at constant volume
B. Lower calorific value at constant volume
C. Higher calorific value at constant pressure
D. Lower calorific value at constant pressure
E. None of the above
Answer» B. Lower calorific value at constant volume
Discussion
357.

Boiler stays are used to___________________?

A. prevent flat surfaces under pressure from tearing apart
B. take care of failure in shear
C. take care of failure in compression
D. provide support for boiler
E. provide foundation of boiler
Answer» B. take care of failure in shear
Discussion
358.

Boiler H.P. is defined as the ________________ ?

A. steam evaporation rate per kg of fuel fired
B. work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam
C. the evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam
D. work 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
Answer» D. work done by 1 kg of steam at saturation condition
Discussion
359.

Boiler parameters are expressed by ___________________?

A. tonnes/hr. of steam
B. pressure of steam in kg/cm2
C. temperature of steam in °C
D. all of the above
E. none of the above
Answer» E. none of the above
Discussion
360.

At which pressure the properties of water and steam become identical_________________?

A. 0.1 kg/cm2
B. 1 kg/cm2
C. 100 kg/cm2
D. 225.6 kg/cm2
E. it is never possible
Answer» E. it is never possible
Discussion
361.

At very low temperature, the melting and boiling temperatures become equal. This temperature is____________________?

A. 373°K
B. 273.16°K
C. 303°K
D. 0°K
E. 300°K
Answer» C. 303°K
Discussion
362.

At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?

A. maximum
B. minimum
C. zero
D. depends on temperature also
E. none of the above
Answer» D. depends on temperature also
Discussion
363.

An ideal regenerative cycle is ______________________?

A. equal to carnot cycle
B. less than carnot cycle
C. more than carnot cycle
D. could be anything
E. none of the above
Answer» C. more than carnot cycle
Discussion
364.

An economiser in a boiler______________________?

A. increases steam pressure
B. increases steam flow
C. decreases fuel consumption
D. decreases steam pressure
E. increases life of boiler
Answer» D. decreases steam pressure
Discussion
365.

Alkaline pyrogallate is used in Orsat’s apparatus for absorption of _________________?

A. C02
B. CO
C. 02
D. N2
E. none of the above
Answer» D. N2
Discussion
366.

Adiabatic process is________________?

A. essentially an isentropic process
B. non-heat transfer process
C. reversible process
D. constant temperature process
E. constant enthalpy process
Answer» C. reversible process
Discussion
367.

A wet vapour can be completely specified by__________________?

A. pressure only
B. temperature only
C. dryness fraction only
D. specific volume only
E. pressure and dryness fraction
Answer» F.
Discussion
368.

A supercritical boiler is one that operates above the pressure and temperature of following values_____________________?

A. 100 kg/cm2 and 540°C
B. 1 kg/cm2 and 100°C
C. 218 kg/cm2 abs and 373°C
D. 218 kg/cm2 abs and 540°C
E. 100 kg/cm2 abs and 373°C
Answer» D. 218 kg/cm2 abs and 540°C
Discussion
369.

A safety valve in a locomotive starts leaking. The leaking medium will be_________________?

A. water
B. dry steam
C. wet steam
D. super heated steam
E. supersaturated steam
Answer» E. supersaturated steam
Discussion
370.

A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are________________?

A. supplied by same manufacturer loose and assembled at site
B. supplied mounted on a single base
C. purchased from several parties and packed together at site
D. packaged boiler does not exist
E. none of the above
Answer» C. purchased from several parties and packed together at site
Discussion
371.

A fusible plug is fitted in small boilers in order to ___________________?

A. avoid excessive build up of pressure
B. avoid explosion
C. extinguish fire if water level in the boiler falls below alarming limit
D. control steam dome
E. remove molten aslj
Answer» D. control steam dome
Discussion