Steam Boilers, Engines, Nozzles And Turbines MCQ Questions & Answers | Mechanical Engineering

A. $$\frac{{2{{\sin }^2}\alpha }}{{1 + {{\sin }^2}\alpha }}$$

B. $$\frac{{2{{\cos }^2}\alpha }}{{1 + {{\cos }^2}\alpha }}$$

C. $$\frac{{1 + {{\sin }^2}\alpha }}{{2{{\sin }^2}\alpha }}$$

D. $$\frac{{1 + {{\cos }^2}\alpha }}{{2{{\cos }^2}\alpha }}$$

A. 1.02 to 1.06

B. 1.08 to 1.10

C. 1.2 to 1.6

D. 1.6 to 2

A. To give maximum space and strength

B. To withstand the pressure of steam inside the boiler

C. Both (A) and (B)

D. None of the above

A. Remains the same

B. Increases

C. Decreases

D. Is unpredictable

A. Boiler efficiency, turbine efficiency, generator efficiency

B. All the three above plus gas cycle efficiency

C. Carnot cycle efficiency

D. Regenerative cycle efficiency

A. 421 kg.m

B. 421 kg.m

C. 539 kg.m

D. 102 kg.m

A. 0.546

B. 0.577

C. 0.582

D. 0.601

A. Maintain the speed of the turbine

B. Reduce the effective heat drop

C. Reheat the steam and improve its quality

D. Completely balance against end thrust

A. Increases evaporative capacity of the boiler

B. Increases the efficiency of the boiler

C. Enables low grade fuel to be burnt

D. All of the above

A. Piston diameter, length of stroke and calorific value of fuel

B. Piston diameter, specific fuel consumption and Calorific value of fuel

C. Piston diameter, length of stroke and speed of rotation

D. Specific fuel consumption, speed of rotation and torque