1. How many categories can the synchronous motors be divided into?
a) 4
b) 3
c) 5
d) 2
Explanation: The synchronous motors can be divided into 5 types of categories. They are hydro-generators, turbo-alternators, engine driven generators, motors, compensators.
2. How is the hydro-generator driven by?
a) water turbine
b) steam turbine
c) internal combustion engines
d) control of reactive power networks
Explanation: The synchronous generators which are driven by the water turbines are called as hydro-generators. The hydro-generators are also known as water wheel generators.
3. What is the speed by which the hydro-generators are driven?
a) 100-1000 rpm
b) 5000 rpm
c) 1500 rpm
d) 3000 rpm
Explanation: The synchronous generators which are driven by the water turbines are called as hydro-generators. The hydro-generators are driven at a speed of 100-1000 rpm.
4. How is the turbo-alternators driven by?
a) water turbines
b) steam turbines
c) engine driven generators
d) compensators
Explanation: The turbo alternators are one category among the synchronous machines. They are driven by the steam turbines.
5. What is the speed of the turbo-alternators?
a) 100-1000 rpm
b) 5000 rpm
c) 1500 rpm
d) 3000 rpm
Explanation: The turbo alternators are one category among the synchronous machines. They are driven by steam turbines. The rating of the turbo-alternators is 3000 rpm.
6. How is the engine driven generators driven by?
a) water turbines
b) steam turbines
c) internal combustion engine
d) compensators
Explanation: The engine driven generators are driven by the different forms of internal combustion engine. These generators have higher speeds for higher power ratings.
7. What is the rating of the engine driven generators?
a) 750 MW
b) 1000 MW
c) 20 MW
d) 700 MW
Explanation: The engine driven generators are driven by the different forms of internal combustion engine. These generators have higher speeds for higher power ratings. These generators have ratings upto 20 MW.
8. Which among the following are the applications of synchronous motors?
a) compressors
b) blowers
c) fans
d) compressors, fans, blowers
Explanation: They are mainly used in the high power and low speed applications. They include compressors, fans, blowers and low head pumps.
9. What is the application of synchronous compensators?
a) control of real power
b) control of active power
c) control of reactive power
d) control of apparent power
Explanation: The main application of the synchronous compensators is to control the reactive powers. They are used in the power supply networks.
10. What is the speed of the engine driven generators?
a) 100-1000 rpm
b) 5000 rpm
c) 1500 rpm
d) 3000 rpm
Explanation: The main application of the synchronous compensators is to control the reactive powers. They are designed to speeds upto 3000 rpm.