Power Generation

In a surface condenser if air is removed, there is___________?

A. fall in absolute pressure maintained in condenser
B. rise in absolute pressure maintained in condenser
C. no change in absolute pressure in the condenser
D. rise in temperature of condensed steam

In a shell and tube surface condenser____________?

A. steam and cooling water mix to give the condensate
B. cooling water passes through the tubes and steam surrounds them
C. steam passes through the cooling tubes and cooling water surrounds them
D. all of the above varying with situation

In jet type condensers___________?

A. cooling water passes through tubes and steam surrounds them
B. steam passes through tubes and cooling water surrounds them
C. steam and cooling water mix
D. steam and cooling water do not mix

The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is_____________?

A. higher
B. lower
C. same as long as initial pressure and temperature is unchanged
D. none of the above

In steam turbines the reheat factor_____________?

A. increases with the increase in number of stages
B. decreases with the increase in number of stages
C. remains same irrespective of number of stages
D. none of the above

Steam turbines are governed by the following methods_____________?

A. Throttle governing
B. Nozzle control governing
C. By-pass governing
D. all of the above

The value of reheat factor normally varies from___________?

A. 0.5 to 0.6
B. 0.9 to 0.95
C. 1.02 to 1.06
D. 1.2 to 1.6

Reheat factor in steam turbines depends on______________?

A. exit pressure only
B. stage efficiency only
C. initial pressures and temperature only
D. all of the above

For Parson’s reaction steam turbine, degree of reaction is____________?

A. 75%
B. 100%
C. 50%
D. 60%

Parson’s turbine is___________?

A. pressure compounded steam turbine
B. simple single wheel, impulse steam turbine
C. simple single wheel reaction steam turbine
D. multi wheel reaction steam turbine