The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be

A 100KW, 250 V, 400 A, a long shunt compound generator has an armature resistance of 0.025 ohms. There are 1000 shunt fields turns per pole and 3 series field turns per pole. The series field is connected in a such a fashion that positive armature current produces direct-axis MMF which adds to that of the shunt field. Compute the gross MMF at the rated terminal current when shunt field current is 4.7A and speed is 1150 rpm.

A

5.9AT

B

3.5AT

C

4.7AT

D

1.2AT

A shunt generator has an induced voltage on open circuit of 127 V. When the machine is on load the terminal voltage is 120 V. The load current if the field resistance be 15 ohm and armature resistance be 15 ohm.

A

342 A

B

350 A

C

358 A

D

8 A

Find the total emf generated in a shunt generator which delivers 200 A at terminal voltage of 230 V, the armature resistance and shunt field resistance are 0.08 Ω and 50 Ω respectively.

A

246.4 V

B

240.6 V

C

250.4 V

D

260.6 V

For a four pole, 200 V dc shunt generator having armature resistance of 1 ohms. The current flowing in the armature is 10 A. What is the back emf generated if the terminal voltage of 220 V supply is fed?

A

230 Volts

B

210 Volts

C

190 Volts

D

200 Volts

A three-phase cylindrical rotor synchronous generator has a synchronous reactance Xs and a negligible armature resistance. The magnitude of per phase terminal voltage is VA and the magnitude of per phase induced emf is EA. Considering the following two statements, P and Q, P: For any three-phase balanced leading load connected across the terminals of this synchronous generator, VA is always more than EA Q: For any three-phase balanced lagging load connected across the terminals of this synchronous generator, VA is always less than EA Which of the following options is correct?

A

P is false and Q is true

B

P is true and Q is false

C

P is false and Q is false

D

P is true and Q is true

If the terminal voltage of 220-V dc generator having armature resistance of 1 ohms. The induced emf produced is 200-V. The armature current for the above machine is?

A

20 A

B

-20 A

C

-10 A

D

10 A

When a transformer is operating on no load the primary applied voltage is approximately balanced by a. Primary Induced emf b. Secondary Induced emf c. Terminal voltage across the secondary d. Voltage drop across the resistance and reactance Which statement/s is/are correct?

A

Only a

B

Only a and b

C

Only c and d

D

Only d

Consider the following statements: In the above figure, the curves pertain to the DC motor A. Speed vs Armature current characteristic of a DC shunt motor B. Torque vs Armature current characteristic of a DC shunt motor C. Speed vs Armature current characteristic of a DC series motor D. Torque vs Armature current characteristic of a DC series motor

A

A - 4, B - 1, C - 3, D - 2

B

A - 2, B - 1, C - 3, D - 4

C

A - 4, B - 3, C - 1, D - 2

D

A - 2, B - 3, C - 1, D - 4

Consider the following statements The equivalent emf is equal to the individual emf of the cells in the series combination of cells having the same emf. The equivalent emf is equal to the individual emf of the cells in the parallel combination of cells having the same emf. Which of the following statement is correct?

A

Only 1

B

Only 2

C

Both 1 and 2

D

Neither 1 and 2

Two D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be

A

270 V

B

267.5 V

C

265 V

D

257.4 V

The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be

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