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Pre-Final Examination

Authored by Rene Ray Andicoy

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University

Used 14+ times

Pre-Final Examination
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100 questions

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1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A 200-hp, 2200 V, 3-phase star-connected synchronous motor has a synchronous impedance of 0.3 + j3 ohm per phase. Determine the induced emf per phase if the motor works on full load with efficiency of 94% and a power factor of 0.8 leading.

1310 V

1360 V

1469 V

1528 V

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A 500 V, 50 Hz, single phase synchronous motor develops 20-hp and is operating at pf of 0.8 lagging. Effective resistance of armature is 1 ohm iron and friction losses of amount to 500W. Determine power drawn by the motor from the source.

17,288 W

20,065 W

21,546 W

21,564 W

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The speed of a synchronous motor connected across a 50 Hz supply is 1000 rpm. Determine the number of poles.

4

6

8

10

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A single phase synchronous motor gives an output of 9.46 kW at 0.9 pf lagging with 600 V. if stray power loss is 600 W and field losses 700 W, while effective armature resistance is 0.6 ohm, find the efficiency of the synchronous motor

74.577 %

84.638 %

86.180%

97.665 %

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A lamp gives an average output of 628 lumens. What is its M.S.C.P.?

40 Cd

45 Cd

48 Cd

50 Cd

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A lamp has luminous intensity of 250 Cd. Calculate the total luminous flux emitted by it.

758 lm

1000 lm

2000 lm

3142 lm

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

1. A light source which radiates lights in all directions has luminous intensity of 100 candela. What is the illumination E in footcandles in a perpendicular working area 10 ft distance below the source?

1

2

2.5

3

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