1. A binary vapour plant consists of ?

steam turbine

steam condenser

mercury boiler

all of these

Answer: all of these

Explanation:


2. The reheat factor depends upon ?

initial pressure and superheat

exit pressure

turbine stage efficiency

all of these

Answer: all of these

Explanation:


3. In a reaction turbine when the degree of reaction is zero, then there is ?

no heat drop in moving blades

no heat drop in fixed blades

maximum heat drop in moving blades

maximum heat drop in fixed blades

Answer: no heat drop in moving blades

Explanation:


4. The nozzle efficiency is the ratio of ?

workdone on the blades to the energy supplied to the blades

workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

none of the above

Answer: energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

Explanation:


5. A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be ?

79 m/s

188 m/s

450 m/s

900 m/s

Answer: 450 m/s

Explanation:


6. The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as ?

regenerative heating

reheating of steam

bleeding

none of these

Answer: bleeding

Explanation:


7. Degree of reaction is defined as the ratio of ?

heat drop in fixed blades to the heat drop in moving blades

heat drop in moving blades to the heat drop in fixed blades

heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades

heat drop in fixed blades plus heat drop in moving blades to the heat drop in moving blades

Answer: heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades

Explanation:


8. The expansion of steam, as it flows over the blades in reaction turbine, represents ?

isothermal process

isentropic process

throttling process

free-expansion process

Answer: isentropic process

Explanation:


9. Curtis turbine is a ?

simple reaction turbine

velocity compounded turbine

pressure compounded turbine

pressure-velocity compounded turbine

Answer: pressure-velocity compounded turbine

Explanation:


10. Which of the following statement is correct ?

The expansion of steam in a nozzle follows Rankine cycle

The friction in the nozzle increases the dryness fraction of steam

The pressure of steam at throat is called critical pressure

all of the above

Answer: all of the above

Explanation: