Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

2 and 4.

2, 3 and 4.

1, 2 and 3.

1, 3 and 4.

2 and 4.

2, 3 and 4.

1, 2 and 3.

1, 3 and 4.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

440 A.

250 A.

570 A.

340 A.

440 A.

250 A.

570 A.

340 A.

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

2 X 1012 Ω - cm at 27°C and 0.2 X 1012

3 X 1012 Ω - cm at 27°C and 0.3 X 1012

1 X 1012 Ω - cm at 27°C and 0.1 X 1012

4 X 1012 Ω - cm at 27°C and 0.4 X 1012

2 X 1012 Ω - cm at 27°C and 0.2 X 1012

3 X 1012 Ω - cm at 27°C and 0.3 X 1012

1 X 1012 Ω - cm at 27°C and 0.1 X 1012

4 X 1012 Ω - cm at 27°C and 0.4 X 1012

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Electrical Machines
In synchronous generator, inverted V curve is drawn between

field current on X-axis and power factor on Y-axis

field current on Y-axis and power factor on X-axis

field current on Y-axis and armature current on X-axis

field current on X-axis and armature current on Y-axis

field current on X-axis and power factor on Y-axis

field current on Y-axis and power factor on X-axis

field current on Y-axis and armature current on X-axis

field current on X-axis and armature current on Y-axis

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Electrical Machines
If input of a transformer is square wave the output will be

triangular wave.

square wave.

pulsed wave.

sine wave.

triangular wave.

square wave.

pulsed wave.

sine wave.

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

2 point starter

All of these

3 point starter

4 point starter

2 point starter

All of these

3 point starter

4 point starter

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Electrical Machines

Electrical Machines Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

Electrical Machines A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

Electrical Machines Minimum allowable resistivity of power transformer insulating oil is generally taken as

Electrical Machines In synchronous generator, inverted V curve is drawn between

Electrical Machines If input of a transformer is square wave the output will be

Electrical Machines Which of the following starter is sufficient to start the DC series motor ?

Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

Electrical Machines
In synchronous generator, inverted V curve is drawn between

Electrical Machines
If input of a transformer is square wave the output will be

Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?