You dont have javascript enabled! Please enable it! MCQ in Power Transmission and Distribution Part 3 | REE Board Exam

# MCQ in Power Transmission and Distribution Part 3 | REE Board Exam

This is the Multiple Choice Questions Part 3 of the Series in Electric Power Transmission and Distribution System Engineering as one of the Electrical Engineering topic. In Preparation for the REE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electrical Engineering field, Electrical Engineering Books, Journals and other Electrical Engineering References.

#### Continue Practice Exam Test Questions Part 3 of the Series

Choose the letter of the best answer in each questions.

101. Which one of the following tests is preferred for checking the parameters of transmission line switchgear insulation.

a. an AC high potential test

b. a DC high potential test

c. short circuit and open circuit test

d. a power factor test

Solution:

102. It Is a type of power system protective device used to isolate one feeder from the power source.

a. isolator

b. disconnect

c. recloser

d. switcher

Solution:

103. The best way to check insulation of a medium voltage distribution system resistance is with a

a. Voltmeter

b. Ohmmeter

c. Ammeter

d. megohmeter

Solution:

104. Insulators are commonly made of

a. Ceramic

b. Mica

c. Porcelain

d. all of these

Solution:

105. One advantage of the aluminum over copper wire in transmission line design is

a. Higher ampicity

b. Higher resistance

c. Available commercially

d. Cheaper

Solution:

106. Pin insulators are made of

a. Paper

b. Porcelain

c. Mica

d. copper

Solution:

107. What test is commonly made on cables after insulation?

a. insulation

b. resistance

c. conductance

d. impedance

Solution:

108. The highest AC transmission line voltage in the Philippines as of May 2004.

a. 230 kV

b. 440 kV

c. 380 kV

d. 500 kV

Solution:

109. DC is preferred over AC for submarine transmission line because:

a. cheaper

b. easier to install

c. not harmful

d. there is no insulation

Solution:

110. AC electrical system became more popular than the Dc electrical system especially in the aspect of distribution primarily because:

a. flexibility of voltage

b. cheaper

c. safer

d. easier to handle

Solution:

111. These are some of the power plant circuit lay โ out except:

a. double bus, single circuit breaker system

b. double bus, double switch system

c. double bus, double circuit breaker system

d. ring bus system

Solution:

112. When alternating current is passing through a parallel conductor there is a tendency that there will exist an induced current between the surface of the conductor. This is known as

a. edge effect

b. proximity effect

c. skin effect

d. Kelvin effect

Solution:

113. Inductive reactance is a measure of the circuit influence of an inductive device. What will happen to the value of self inductance if the system frequency is replaced by High value?

a. Remain unchanged

b. Decrease

c. Depends on voltage level

d. Increase

Solution:

114. A short, 230 kV transmission line has an impedance of 5 cis 78 ohms. The load at the receiving end is 100 MW at 230 kV, 85% lagging power factor. What is the voltage at the sending end?

a. 235.43 kV

b. 226.3 kV

c. 231.78 kV

d. 238.21 kV

Solution:

115. A short, 230 kV transmission line has an impedance of 2 + j8 ohms. The receiving end has 85 MW load 90% lagging power factor. What is the voltage at the sending end?

a. 234.76 kV

b. 236.3 kV

c. 230.58 kV

d. 232.18

Solution:

116. A load of 10 MVA, 0.8 lagging power factor is served by 22 KV transmission line which has a line resistance of 3 ฮฉ and a line reactance of 10 ฮฉ. Solve for the sending end voltage.

a. 22.56 kV

b. 25.972 kV

c. 24.177 kV

d. 29.86 kV

Solution:

117. An overhead, 60 Hz, single phase transmission line delivers 1.1 MW load at 33 KV at 80 % lagging power factor. The total resistance and inductive reactance of the line is 10 ฮฉ and 15 ฮฉ, respectively. Determine the power factor and efficiency of the line.

a. 81.25%, 99.17%

b. 79.77%, 98.446%

c. 72.41%, 97.41%

d. 81.78%, 96.45%

Solution:

118. A transmission line with an impedance of (4 + j7.5) ohms is supplying a load of 1000 kW at 80% lagging. What is the sending end power factor for a receiving end voltage equal to 13.2 kV?

a. 0.80

b. 0.635

c. 0.471

d. 0.785

Solution:

119. A short transmission line supplies power to a load of 30 MVA at 230 kV, 0.8 lagging power factor. Calculate the percent regulation for a line impedance of (12 + j 36) ohms.

a. 1.78 %

b. 1.87 %

c. 2.18 %

d. 2.52 %

Solution:

120. What is the maximum line length in km for a single phase transmission line having a copper conductor of 0.775 sq. cm. cross section over which a 200 KW unity power factor and at 3.3 KV can be delivered? The efficiency of the line is 90 %. Take the specific resistance of the conductor at 1.725 x 10-8 ohm-meter.

a. 12.8 km

b. 13.6 Km

c. 15.7 km

d. 18.6 km

Solution:

121. A balanced wye (star) connected load of 300 + j 100 ฮฉ is supplied by a three phase transmission line 40 miles long with an impedance of 0.6 + j 0.7 ฮฉ per mile. Find the voltage at the receiving end when the voltage at the sending end is 33 kV. What is the phase angle between these voltages?

a. 29.96 KV angle of 3.122 degrees

b. 33.16 angle 1.17 degrees

c. 25.57 angle 3.75 degrees

d. 28.67 angle 2.58 degrees

Solution:

122. A short three phase transmission line with an impedance of 3+j4 ohms per conductor supplies two sets of balanced load consisting of

Load 1 = 5,000 KW at 0.85 lagging power factor

Load 2 = static lossless capacitor banks drawing 100 Amp line current

Compute for the sending end voltage and power

a. 12.8 KV, 5.21 MW

b. 15.15 KV, 5.40 MW

c. 15.7 KV, 5.21 MW

d. 18.6 KV, 5.32 MW

Solution:

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