In water tube boilers water passes through the tubes which are surrounded by fla

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Mechanical Engineering ‣ Steam Boilers and Engines Comments

Question
In water tube boilers
Options
A. water passes through the tubes which are surrounded by flames and hot gases
B. the flames and hot gases pass through the tubes which are surrounded by water
C. forced circulation takes place
D. none of these

Correct Answer

water passes through the tubes which are surrounded by flames and hot gases

Steam Boilers and Engines problems

Search Results

1. In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be
Options
A. 56%
B. 63%
C. 74%
D. 78%

2. Which of the following statement is correct for a compound steam engine?
Options
A. The cost of the engine, for the same power and economy, is more than that of a simple steam engine.
B. The forces in the working parts are increased as the forces are distributed over more parts.
C. The ratio of expansion is reduced, thus reducing the length of stroke.
D. The temperature range per cylinder is increased, with corresponding increase in condensation.

3. Which of the following statement is wrong?
Options
A. The factor of evaporation for all boilers is always greater than unity.
B. The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100� C.
C. The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency.
D. none of the above

4. The function of a safety valve is
Options
A. to blow off steam when the pressure of steam inside the boiler exceeds the working pressure
B. to indicate the water level inside the boiler to an observer
C. to measure pressure of steam inside the steam boiler
D. none of the above

5. When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a
Options
A. slow speed engine
B. medium speed steam engine
C. high speed steam engine
D. none of these

6. Which of the following statement is wrong?
Options
A. Locomotive boiler is a water tube boiler.
B. Water tube boilers are internally fired.
C. La-mont boiler is a low pressure water tube boiler.
D. all of the above

10. The object of producing draught in a boiler is
Options
A. to provide an adequate supply of air for the fuel combustion
B. to exhaust the gases of combustion from the combustion chamber
C. to discharge the gases of combustion to the atmosphere through the chimney
D. all of the above

Comments

More in Mechanical Engineering: