# Electrical Engineering Objective Questions { Alternators }

169. In a synchronous machine, the electric circuits are armature circuit, field circuit and damper circuit and Xd is d-axis synchronous reactance; X'd is d-axis transient synchronous reactance and X"d is d-axis sub-transient synchronous reactance. If there is no damper winding,then

170. An alternator of 400 kW is driven by a prime mover of speed regulation 4% and another alternator of 200 km is driven by a prime mover of speed regulation 3%. The total load they can take, without overloading either of the machines is

171. Consider the following statements : Modern alternators are designed for large airgap to have 1. large inherent regulation. 2. very stable parallel operation. 3. higher stability limit. 4. sinusoidal mmf distribution. Which of these statements are correct?

172.  To calculate the full-load voltage regulation of a synchronous generator at any power factor using mmf method, it is required to have

173.  An alternator is operating on infinite bus. It will develop maximum synchronizing power when it is operating at

174.  A 3-phase cylindrical rotor alternator is delivering rated power to a grid at its rated power factor. On account of some fault, steam supply to the turbine of the alternator is cut-off. The alternator would.

Page 25 of 25

25