Related Questions

In A.C. series motor compensating winding is employed to
A reduce the effects of armature reaction
B increase the torque
C reduce sparking at the brushes
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
In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
A improve power factor
B increase overload capacity
C reduce fluctuations in torque
D to improve torque
Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors?
A Low cost
B Wide speed range
C Stability
D High starting torque
Some wire- wound resistors have bifilar winding. This type of winding is used to
A Increase the thermal stability
B Reduce the tolerance
C Reduce the inductance of winding
D Double the power rating of the resistor
________ cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall
A Direct
B Indirect
C Conventional
D Any of the above
Compensating windings are used in D.C. generators
A Mainly to reduce the eddy currents by providing local short-circuits
B To provide path for the circulation of cooling air
C To neutralize the cross-magnetizing effect of the armature reaction
D None of the above
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the
A Jet area is automatically varied depending on the suction
B The flow from the main jet is diverted to the compensating jet with increase in speed
C The diameter of the jet is constant and the discharge coefficient is invariant
D Flow is produced due to the static head in the float chamber
If a seller recovers his capital along with accumulated compensating interest not in one single lump-sum payment but in periodical equal payments, over time:
A Capital Recovery Annuity fs availed
B Present work Annuity is availed
C Sinking Fund Annuity is availed
D Sinking Fund Annuity is availed
In a low power factor wattmeter the compensating coil is connected
A in series with current coil
B in parallel with current coil
C in series with pressure coil
D in parallel with pressure coil

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