A) yoke B) commutator C) winding D) frame. Ans : (B)
A) the motor will tend to run at infinite speed B) the motor will stop C) its speed will remain unchanged D) its speed will approach zero. Ans : (A)
A) torque angle is zero B) torque angle is 90o C) two magnetic fields are aligned with each other D) field strength are maximum and torque angle is zero. Ans : (B)
A) DC short shunt compound motor B) DC compound motor C) DC shunt motor D) DC series motor. Ans : (C)
A) core losses of motor B) residual magnetism of the generator C) mechanical losses of motor and generator together D) all of the above. Ans : (B)
A) halved B) zero C) unaltered D) doubled. Ans : (D)
A) armature voltage of dc motor B) armature current of dc motor C) field excitation of dc motor D) supply voltage. Ans : (A)
A) low B) around 100 ohms C) very large D) infinitely large. Ans : (A)
A) motor will stop B) motor will burn C) motor will pick up high speed D) motor will make noise. Ans : (C)
A) Hyperbola B) Ellipse C) Parabola D) Circle. Ans : (A)