Related Questions

In repulsion motor, zero torque is developed when
A brush axis is 45° electrical to field axis
B brush axis coincides with the field axis
C brush axis is 90° electrical to field axis
D both (B) and (C)
Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.
A shunt motor
B series motor
C compound motor
D separately excited motor
In repulsion motor direction of rotation of motor
A Is opposite to that of brush shift
B Is the same as that of brush shift
C Is independent of brush shift
D None
A repulsion motor is equipped with
A slip rings
B commutator
C both (A) and (B)
D none of the above
The purpose of stator winding in the compensated repulsion motor is to
A provide mechanical balance
B improve power factor and provide better speed regulation
C prevent hunting in the motor
D eliminate armature reaction
Which of the following statements regarding repulsion-start induction motor is incorrect ?
A It requires more maintenance of commutator and other mechanical devices
B It makes quite a bit of noise on starting
C In fractional horse power motors, it has replaced the capacitor motors
D It is not easily reversed
The repulsion start induction run motor is used because of
A good power factor
B high efficiency
C minimum cost
D high starting torque
In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
A Remain unchanged
B Reduce to one-fourth value
C Increase four folds
D Be doubled
The ratio of starting torque to running torque in a synchronous motor is
A zero
B one
C two
D infinity
A shaft is subjected to bending moment M and a torque T simultaneously. The ratio of the maximum bending stress to maximum shear stress developed in the shaft, is
A $$\frac{{\text{M}}}{{\text{T}}}$$
B $$\frac{{\text{T}}}{{\text{M}}}$$
C $$\frac{{2{\text{M}}}}{{\text{T}}}$$
D $$\frac{{2{\text{T}}}}{{\text{M}}}$$

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