Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 ohms.
 1.9 ohms.
 5.7 ohms.
 2.2 ohms.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Flashing of DC generator means

None of these
 neutralization of residual magnetism.
  creation of residual magnetism by a DC source.
  increasing flux density by providing extra ampere-turns in field.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

 both the windings have thin leads
 armature winding has thin leads whereas field winding has thick leads
 both the windings have thick leads
 armature winding has thick leads whereas field winding has thin leads

ANSWER DOWNLOAD EXAMIANS APP