Venus International College of Technology Electrical Engineering Department B. E. Semester-VI [Electrical] , January 2014 4: Synchronous Motor-II (Power and Torque equations) Date of issue:

Last date of submission:

A: Numericals (Any Four) 1

A 3-Φ, 400-v, synchronous motor takes 52.5A at a power factor of 0.8 leading. Calculate the power supplied and the induced e.m.f. The motor impedance per phase is (0.25+j3.2) Ω. [29.1kW;670V]

2

The input to a 11-kV,3-Φ, Y-connected synchronous motor is 60A. the effective resistance and synchronous reactance per phase are 1Ω and 30 Ω respectively. Find (a) power supplied to the motor and (b) the induced e.m.f. for a p.f. of 0.8 legging. [(a) 915 kW (b) 13kV]

3

A 3Φ synchronous motor connected to 6600V mains has a star connected armature with an impedance of (2.5+j1.5) Ω per phase. The excitation of the machine gives 7000V. the iron, friction and excitation losses are 12kW. Find the maximum output of the motor. [153.68kW]

4

the input to an 11000V, 3Φ star connected synchronous motor is 60A. the effective resistance and synchronous reactance per pahse are respectively 1Ω and 30Ω. Find the power supplied to the motor and the induced electromotive foace for a p.f. of 0.8 leading. [914.5kW, 13kV]

5

A 400V, 6 pole. 3Φ, 50Hz. Star connected synchronous motor has a resistance and synchronous reactance of 0.5Ω per phase and 4Ω per phase respectively. It takes a current of 15A at unity p.f. when operating with a certain field current. If the load torque is increased until the line current is 60A, the field current remaining unchanged, find the gross torque developed, and the new p.f. [354Nm; 0.93]

6

The input to a 11k-V, 3-phase, star-connected synchronous motor is 60 amperes. The effective resistance and synchronous reactance per phase are respectively 1 ohm and 30 ohm. Find the power supply to the motor and the induced e.m.f. for p.f. of .8 (a) leading and (b) lagging. [915kw (a) 13kv (b) 9.36kv]

7

An industrial load of 800 kW is operating at 0.6 lagging power factor. It is desired to improve power factor to 0.92 lagging by connecting synchronous motor driving a load of 200 kW with 91% efficiency. Determine KVA rating of synchronous motor and its operating power factor.

B: Choose the most appropriate option. 1

## Institute of Technology

Venus International College of Technology. Electrical Engineering Department. B. E. Semester-VI [Electrical] , January 2014. 4: Synchronous Motor-II (Power ...

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