Proffesional Electrical Engineering Quiz 2 Part 1-54

A 4-pole lap winding motor with 16 slots, 42 conductors per slot, 480 V runs at 1,800 rpm. Find the flux produced per pole.

• 11.9 mWb

• 47.6 mWb

• 35.7 mWb

• 23.8 mWb

Compute for the core loss if the transformer consumes 75 watts when it is connected across a 240 V source and taking 1.4 A. The primary resistance is 0.25 Ω.

• 73.6 W

• 74.65 W

• 74.75 W

• 74.51 W

What is the total power consumed by the load when the readings of two wattmeters are 5 kW and -0.5 kW?

• 5.5 kW

• 4.5 kW

• 5 kW

• 4.05 kW

Find the reactive factor of the load having 30 kW and 50 kVA.

• 0.6

• 0.8

• 0.5

• 0.7

Find the total resistance if 3 Ω is connected in series with the parallel combination of 4 Ω, 5 Ω, and 20 Ω.

• 4 Ω

• 5 Ω

• 6 Ω

• 7 Ω

Given a 100 kVA 2,400/240 V single-phase transformer. Find the current transformer (CT) ratio at the low voltage side.

• 700:5

• 600:5

• 500:5

• 400:5

One kWHR is equal to ______ BTU.

• 360

• 3,413

• 3,600

• 1,000

Convert the delta-connected impedances of 12∠36° Ω to balanced wye-connected impedances.

• 3∠36° Ω

• 6.2∠36° Ω

• 4∠36° Ω

• 12∠36° Ω

Heating effect of current has an undesirable side effect in:

• electric oven

• immersion heater

• electric iron

• vacuum cleaner

The primary of a transformer has 200 turns and is excited by a 240 V, 60 Hz source. What is the maximum value of the core flux?

• 4.04 mWb

• 4.4 mWb

• 4.13 mWb

• 4.32 mWb