Question: The compression ratio in a gas turbine is of the roder of____________________?

• 1. 3.5 : 1
• 2. 5 : 1
• 3. 8 : 1
• 4. 12 : 1

Question: The working fluid in ai turbine is___________________?

• 1. in two phases
• 2. in three phases
• 3. in a single phase
• 4. in the form of air and water mixture

Question: If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix i and o stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity______________?

• 1. Vi=V0B
• 2. Vt>V0
• 3. U,
• 4. V,= U0

Question: In jet engines the products of combustion after passing through the gas lurbine are discharged into_______________?

• 1. atmosphere
• 2. back to the compressor
• 3. discharge nozzle
• 4. vacuum

Question: Pick up the false statement ?

• 1. gas turbine is a self-starting unit
• 2. gas turbine does not require huge quantity of water like steam plant
• 3. exhaust losses in gas turbine are high due to large mass flow rate
• 4. overall efficiency of gas turbine plant is lower than that of a reciprocating engine

Question: Pick up the correct statement?

• 1. closed cycle gas turbine is an I.C engine
• 2. gas turbine uses same working fluid over and over again
• 3. air-fuel ratio in a gas turbine is 100 : 1
• 4. thrust in turbo-jet is produced by nozzle exit gases

Question: Pick up the wrong statement ?

• 1. pulsojet requires no ambient air for propulsion
• 2. ramjet-engine has no turbine
• 3. turbine drives compressor in a burbojet
• 4. bypass turbo-jet engine increases the thrust without adversely affecting, the propulsive efficiency and fuel economy

Question: Pick up the correct statement ?

• 1. large gas turbines use radial inflow turbines
• 2. gas turbines have their blades similar to steam turbine
• 3. gas .turbine’s blade will appear as impulse section at the hub and as a reaction section at tip
• 4. gas turbines use both air and liquid cooling

Question: Choose the correct statement ________________?

• 1. gas turbine requires lot of cooling water
• 2. gas turbine is capable of rapid start up and loading
• 3. gas turbines have flat efficiency at part loads
• 4. gas turbines have high standby losses and require lot of maintenance

Question: Pick up the wrong statement ?

• 1. large gas turbines employ axial flow compressors
• 2. axial flow compressors are more stable than centrifugal type compressors but not as efficient
• 3. axial flow compressors have high capacity and efficiency
• 4. axial flow compressors have instability region of operation