1. Most common application of steam turbine is _______
a) Motor
b) Generator
c) Pump
d) Filter
Explanation: Since the turbine generates rotary motion, it is best suited for the use of electrical generator. It is used to drive an electrical generator. Now a days, the maximum usage for generation of electricity is done by using an electrical generator.
2. Conical diffuser draft tube consists of conical diffuser with angles of______
a) 10 degrees
b) 20 degrees
c) 30 degrees
d) 40 degrees
Explanation: Conical diffuser draft tube is one of the most commonly used drafts tubes in the Kaplan turbine. Conical diffuser draft tube consists of conical diffuser with angles less than or equal to 10 degrees.
3. What is the purpose of a conical diffuser?
a) To prevent flow separation
b) To avoid Pressure drag
c) To prevent rejection of heat
d) To increase efficiency
Explanation: Conical diffuser draft tube is one of the most commonly used drafts tubes in the Kaplan turbine. It is called so because it consists of a conical diffuser. The main function of the diffuser is to prevent flow separation.
4.What is the efficiency of conical diffuser draft tube?
a) 30
b) 50
c) 70
d) 90
Explanation: Conical diffuser draft tube is one of the most commonly used drafts tubes in the Kaplan turbine. It is called so because it consists of a conical diffuser. The main function of the diffuser is to prevent flow separation. The efficiency of conical diffuser draft tube is 90 percent.
5. The simple elbow draft tube is placed close to the_______
a) Head race
b) Tail race
c) Tank
d) Nozzle
Explanation: The simple elbow draft tube is placed close to the tail race. It consists of an extended elbow type tube. It is mainly used in the Kaplan turbine. It is placed close to the tail race of the turbine.
6. Turbine that consists of moving nozzles and with fixed nozzles is called as__________
a) Impulse turbine
b) Curtis turbine
c) Rateau turbine
d) Reaction turbine
Explanation: A turbine that consists of moving nozzles which are alternating with the fixed nozzles is called as a reaction turbine. When the steam hits the nozzle, the pressure is decreased and the temperature is increased
7. An example of reaction turbine is________
a) Parsons turbine
b) Curtis turbine
c) Rateau turbine
d) Pelton wheel
Explanation: A turbine that consists of moving nozzles which are alternating with the fixed nozzles is called as a reaction turbine. When the steam hits the nozzle, the pressure is decreased and the temperature is increased. It is also called as Parson’s turbine.
8. When we arrange turbine blades in multiple stages it is called ________
a) Pressure change
b) Vane deviation
c) Compounding
d) Pressure ratio
Explanation: When we arrange turbine blades in multiple stages it is called as compounding. Compounding plays an essential role in turbines. It has various plus points.
9. Compounding is needed to ___________
a) Increase Pressure
b) Decrease temperature
c) Change volume
d) Increase efficiency
Explanation: Compounding is needed to improve efficiencies at low speeds. When we arrange turbine blades in multiple stages it is called as compounding. Compounding plays an essential role in turbines.
10. Which among the following is not a type of compounding?
a) Pressure
b) Temperature
c) Pressure velocity
d) Velocity
Explanation: Temperature is not a type of compounding. The three important types of compounding are pressure compounding, velocity compounding and pressure- velocity compounding.