A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

0.96

1.06

0.95

0.87

0.96

1.06

0.95

0.87

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Electrical Machines
Torque developed in the rotor is

either of these

directly proportional to slip

inversely proportional to slip

not dependent on the slip

either of these

directly proportional to slip

inversely proportional to slip

not dependent on the slip

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Electrical Machines
In escalator which motor is used?

DC shunt motor.

Universal motor.

3 - φ IM.

1 - φ IM.

DC shunt motor.

Universal motor.

3 - φ IM.

1 - φ IM.

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Electrical Machines
The use of higher flux density in the transformer design

increases the weigh per KVA

None of these

reduces the weigh per KVA

has no relation with the weight of transformer

increases the weigh per KVA

None of these

reduces the weigh per KVA

has no relation with the weight of transformer

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Electrical Machines
The type of DC generator used for arc welding purpose is a

differentially compounded generator

shunt generator

series generator

cumulatively compounded generator

differentially compounded generator

shunt generator

series generator

cumulatively compounded generator

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

R2 = sX2.

sR2 = X2.

R2 = s2X2.

R2 = sX2.

sR2 = X2.

R2 = s2X2.

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Electrical Machines

Electrical Machines A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines Torque developed in the rotor is

Electrical Machines In escalator which motor is used?

Electrical Machines The use of higher flux density in the transformer design

Electrical Machines The type of DC generator used for arc welding purpose is a

Electrical Machines When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines
Torque developed in the rotor is

Electrical Machines
In escalator which motor is used?

Electrical Machines
The use of higher flux density in the transformer design

Electrical Machines
The type of DC generator used for arc welding purpose is a

Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be