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BASIC NEC 2023

Synchronous Generator Practice Questions

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Synchronous Generator Practice Questions — Question List

Question 1: Low speed synchronous machines are often driven by which of the following turbines?

hydro - turbines
steam turbines
Gas turbines

Question 2: In rotating armature synchronous machines ..............

The armature winding is on rotor and field winding is on stator
The armature winding is on stator and field winding is on rotor
Both armature and field winding is on stator
Both armature and field winding is on rotor

Question 3: EMF method is used to measure ................... of synchronous Generator.

voltage regulation
induced EMF
Terminal Voltage
Short Circuit current

Question 4: Which of the following is the speed of the 2 pole 60 Hz synchronous machine?

3600 rpm
7200 rpm
1800 rpm
1000 rpm

Question 5: Which of the following turbines are most efficient at higher generator speed?

Steam Turbines
Water Turbines
Gas Turbines

Question 6: In synchronous generator the terminal voltage .......................

lags the current by 90 degrees
leads the current by 90 degrees
lags the current by 45 degrees
leads the current by 45 degrees

Question 7: When an inductive load is added to synchronous generator , which following will be observed?

The phase voltage will increase slightly
The phase voltage will decrease slightly
The phase voltage will be constant

Question 8: A synchronous generator with a no-load frequency of 62 Hz with a droop of 2MW/Hz connected to a 2MW load with a power factor of 0.8. What is the operating frequency of synchronous generator?

62 Hz
61 Hz
60 Hz
59 Hz

Question 9: The governor of a synchronous machine controls ..............

Operating frequency of machine
No -Load Frequency of the machine
Operating voltage of the machine
No-Load Voltage of the machine

Question 10: When the synchronous generator is connected to grid without proper synchronization, then ............................ will flow in the system.

Very large current
very large reactive power
very large real power
very large voltage

Question 11: In synchronization the frequency of the incoming machine must be slightly lower than running machine (system).

True
False

Question 12: The slip of a synchronous machine ranges between zero and unity.

True
False

Synchronous Generator Practice Questions

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