Generators work on the principle of production of dynamically and statically induced emf. dynamically induced emf. statically induced emf. None of these TRUE ANSWER : ? YOUR ANSWER : ?
In DC series motor the speed is ______________ proportional to the armature current. has no relation. inversely. directly. none of these. TRUE ANSWER : ? YOUR ANSWER : ?
In a DC Shunt Motor if the load current increases keeping the terminal voltage constant, then flux will increase. decrease. any of the above. remain constant. TRUE ANSWER : ? YOUR ANSWER : ?
In case of a compensated DC series motor, the compensating winding is provided In parallel with the field winding. In series with the armature winding. As a separate unit. In parallel with the armature winding. TRUE ANSWER : ? YOUR ANSWER : ?
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator? Armature current. Can not be determined. Mechanical power. Induced emf. TRUE ANSWER : ? YOUR ANSWER : ?
Number of slip rings in 3-phase synchronous motor will be 1 0 3 or 4 2 TRUE ANSWER : ? YOUR ANSWER : ?
With the increase in speed of DC motor Both back emf as well as line current fall. Back emf increase but line current falls. Both back emf as well as line current increase. Back emf falls and line current increase. TRUE ANSWER : ? YOUR ANSWER : ?
In dc machine armature windings are placed on rotor because of the necessity for electromechanical energy conversion. commutation. generation of voltage. development of torque. TRUE ANSWER : ? YOUR ANSWER : ?
In DC machines internal characteristics are plotted between Eg vs load current Vt vs load current Eg vs Ia Vt vs Ia TRUE ANSWER : ? YOUR ANSWER : ?
At slip s = 1 torque developed in machine is none. electromagnetic torque. starting torque. maximum torque. TRUE ANSWER : ? YOUR ANSWER : ?