A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

2 .1 Ω

1.79 Ω

1.8 9 Ω

3.1 Ω

2 .1 Ω

1.79 Ω

1.8 9 Ω

3.1 Ω

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Electrical Machines
In most condition which frame of motor will be preferred?

Open type.

Splash proof.

Drip proof.

Totally enclosed fan coiled.

Open type.

Splash proof.

Drip proof.

Totally enclosed fan coiled.

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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.

R2 = s2X2.

sR2 = X2.

R2 = sX2.

R2 = s2X2.

sR2 = X2.

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Electrical Machines
For larger units high torque it is preferred to use

Partial motor.

Universal motor.

Slip induction motor.

DC shunt motor.

Partial motor.

Universal motor.

Slip induction motor.

DC shunt motor.

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

50 Hz

45 HZ

48 Hz

48.5 Hz

50 Hz

45 HZ

48 Hz

48.5 Hz

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Electrical Machines
Wave winding is employed in DC machine of

high current and low voltage rating.

low current and low voltage rating.

low current and high voltage rating.

high current and low voltage rating.

low current and low voltage rating.

low current and high voltage rating.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

Electrical Machines In most condition which frame of motor will be preferred?

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 For larger units high torque it is preferred to use

Electrical Machines Wave winding is employed in DC machine of

Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

Electrical Machines
In most condition which frame of motor will be preferred?

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
For larger units high torque it is preferred to use

Electrical Machines
Wave winding is employed in DC machine of