Synchronous Machines Objective Questions
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An electromechanical energy conversion device has cylindrical stator but salient pole rotor. Rotor is not excited. If Î´ is the angle between stator field and rotor long axis, then average torque developed is proportional to (A and B are constants)
Correct!
Wrong!

In a two phase cylindrical rotor synchronous machine, the self inductances L_{Î±}, L_{Î˛} for phases Î±,Î˛ respectively are __________
Correct!
Wrong!

Which of the following equation represents the reluctance torque of a salient pole synchronous machine?
Correct!
Wrong!

An electromechanical energy conversion device has cylindrical stator but salient pole rotor. If Î´ is the angle between stator field and rotor field, the average torque developed is proportional to (A and B are constants) __________
Correct!
Wrong!

The self and mutual inductances of a doubly excited magnetic system are L_{s}=0.6+0.20cos2Î¸_{r}Â H and L_{r}=0.75+0.30cos2Î¸_{r}Â H and M_{sr}=0.8cosÎ¸_{r}Â H. For a stationary rotor at an angular position of Î¸_{r}=60Â°,what is the magnitude of torque when the currents i_{s}=20A DC and i_{r}=10A DC?
Correct!
Wrong!

In a single phase cylindrical rotor synchronous machine, the torque T_{e} tends to ____________ the space angle Î¸_{r}.
Correct!
Wrong!

In a two phase cylindrical rotor synchronous machine, the mutual inductance M_{Î±Î˛}Â between Î± phase and Î˛ phase winding is __________
Correct!
Wrong!

Consider a single phase synchronous machine of cylindrical rotor type. A single phase supply is given to the stator winding, and a voltmeter is connected across rotor winding. For what value of Î¸_{r} the voltmeter reads a zero?
Correct!
Wrong!

Consider a single phase synchronous machine of cylindrical rotor type. A single phase supply is given to the stator winding and a voltmeter is connected across rotor winding. For what value of Î¸_{r}, the voltmeter reads maximum?
Correct!
Wrong!

The following torque expression: T_{e}=i_{s}i_{r}M_{max}sinÎ¸_{r}Â is applicable in a single phase cylindrical rotor synchronous machine when the rotor is __________
Correct!
Wrong!

Which of the following equation best represents the mutual inductance between stator and rotor in a single phase cylindrical rotor synchronous machine?
Correct!
Wrong!

In a two phase cylindrical rotor synchronous machine, torque T_{e} is _______
Correct!
Wrong!

Which component of torque equation, T_{e(av)}= 1/8 I_{m}^{2}(L_{d}L_{q})sin2Î´+1/2 I_{f}I_{m}M_{max}sinÎ´ represents the electromagnetic/interaction torque in single phase salient pole synchronous machine?
Correct!
Wrong!
