Synchronous Machines Objective Questions

An electromechanical energy conversion device has cylindrical stator but salient pole rotor. Rotor is not excited. If δ is the angle between stator field and rotor long axis, then average torque developed is proportional to (A and B are constants)

In a two phase cylindrical rotor synchronous machine, the self inductances L_α, L_β for phases α,β respectively are __________

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

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

The self and mutual inductances of a doubly excited magnetic system are L_s=0.6+0.20cos2θ_r H and L_r=0.75+0.30cos2θ_r H and M_sr=0.8cosθ_r H. For a stationary rotor at an angular position of θ_r=60°,what is the magnitude of torque when the currents i_s=20A DC and i_r=10A DC?

In a single phase cylindrical rotor synchronous machine, the torque T_e tends to ____________ the space angle θ_r.

In a two phase cylindrical rotor synchronous machine, the mutual inductance M_αβ between α phase and β phase winding is __________

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 θ_r the voltmeter reads a zero?

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 θ_r, the voltmeter reads maximum?

The following torque expression: T_e=-i_si_rM_maxsinθ_r is applicable in a single phase cylindrical rotor synchronous machine when the rotor is __________

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

In a two phase cylindrical rotor synchronous machine, torque T_e is _______

Which component of torque equation, T_e(av)= 1/8 I_m²(L_d-L_q)sin2δ+1/2 I_fI_mM_maxsinδ represents the electromagnetic/interaction torque in single phase salient pole synchronous machine?