330. In a steam thermal power plant, in order to build up the vacuinn in the condeOer, the turbine glands are sealed by supplying steam from
A.Boiler
B.Leakage steam
C.Auxiliary steam source
D.Extraction steam

---

331. The number of stages in an i pulse turbine'-as compared tot reaction tur 'tie is
A.Same
B.More
C.Less
D.More/less depending on capacity

---

332. The pressure in the gland steam header for sealing the glands of low pressure steam turbine is maintained
A.At vacuum
B.At atmospheric conditions
C.At around 0-1 mm wcl
D.At around 100-200 mm we!

---

333. Differential expansion takes place due to
A.Thermal expansion of casing
B.Wearing of thrust pad
C.Different expansions of casing and rotor
D.Cooling of casing due to radiation

---

334. After turbine trip, the cooling water to condenser is stopped
A.Immediately
B.After 15-30 mts
C.Never stopped
D.May be stopped any time

---

335. The ratio of work done by the blades per kg of steam flowing through a set of fixed and moving blades, and the corresponding isentropic enthalpy drop is called
A.Nozzle efficiency
B.Blade efficiency
C.Stage efficiency
D.Relative efficiency

---

336. Stage efficiency of steam turbine is equal to
A.Blade efficency/nozzle efficiency
B.Nozzle efficiency/blade efficiency
C.Nozzle efficiency x blade efficiency
D.1- blade effic;e,ncy

---