Electrical Engineering · Question Bank

Fundamentals of Electricity

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#61📜 EE Pre-Board March 2018📘 PowerhouseEasy
The output of a motor in watts when it takes a power of 3 kW and its efficiency is 75% is
A2000
B2250
C2500
D2750
#62📜 EE Pre-Board March 2018📘 PowerhouseEasy
A heater wire of length 50 cm and 1 mm² in cross-section carries a current of 2 A when connected across a 2 V battery. What is the resistivity of the wire?
A\(2 \times 10^{-6}\) Ω·m
B\(2 \times 10^{-8}\) Ω·m
C\(4 \times 10^{-6}\) Ω·m
D\(4 \times 10^{-8}\) Ω·m
#63📜 EE Pre-Board March 2018📘 PowerhouseEasy
The condition in Ohm’s law is that
Athe ratio V/I should be constant
Bcurrent should be proportional to voltage
Cthe temperature should remain constant
Dthe temperature should vary
#64📜 EE Pre-Board March 2018📘 PowerhouseEasy
How is the storage battery rated in capacity?
Avolts
Bwatts
Camperes
Dampere-hour
#65📜 EE Pre-Board August 2018📘 PowerhouseEasy
Find the frequency of a radio wave whose wavelength is 600m.
A500Hz
B500kHz
C150Hz
D150kHz
#66📜 EE Pre-Board August 2018📘 PowerhouseEasy
The condition in Ohm’s Law is that
Aratio V/I should be constant
Bcurrent should be proportional to voltage
Cthe temperature should remain constant
Dthe temperature should vary
#67📜 EE Pre-Board August 2018📘 PowerhouseEasy
An aluminum cable has 10 identical strands, a length of 1,500m and a diameter of 2.50 mm each. What is the resistance of the cable?
A86.3 Ω
B0.863 Ω
C56.3 Ω
D0.563 Ω
#68📜 EE Pre-Board August 2018📘 PowerhouseEasy
Wavelength is the distance travelled by an electromagnetic wave during the time of one cycle. Given a wavelength of 12 meters, what is the frequency?
A250 kHz
B25 kHz
C250 MHz
D25 MHz
#69📜 EE Pre-Board August 2018📘 PowerhouseEasy
The condition of a liquid electrolyte is measured in terms of its
Acurrent value
Bspecific gravity
Cacid content
Dvoltage output
#70📜 EE Pre-Board August 2018📘 PowerhouseEasy
If a certain conductor has an area of 336,400 circular mils, what is the radius of this conductor in cm?
A0.0663
B0.81
C0.737
D0.921
#71📘 EE Pocket Reviewer RojasEasy
What is the temperature coefficient of resistance of a conductor?
APositive
BNegative
CZero
DEither A or
#72📘 EE Pocket Reviewer RojasEasy
Which of the following is false?
AA lead-acid cell can be recharged
BA primary cell has an irreversible chemical action
CA storage cell has a reversible chemical action
DA carbon-zinc cell has unlimited shelf life
#73📘 EE Pocket Reviewer RojasEasy
A good conductor has a high ____
AResistance
BImpedance
CConductance
DReluctance
#74📘 EE Pocket Reviewer RojasEasy
The mass of an atom is determined by the number of which of the following?
ANeutrons
BElectrons
CNeutrons and protons
DElectrons and neutrons
#75📘 EE Pocket Reviewer RojasEasy
Which of the following is a unit of conductivity?
AMho/meter
BMho-meter
COhm-meter
DOhm/meter
#76📘 EE Pocket Reviewer RojasEasy
Trickle charging of a storage battery
AIncreases its capacity
BPrevents sulphation
CKeeps it fresh and fully charged
DMaintains proper electrolyte level
#77📘 EE Pocket Reviewer RojasEasy
The temperature coefficient of resistance of a material is expressed in terms of which of the following units?
AOhms/ohm/°C
BMhos/ohm/°C
CMhos/°C
DOhms/°C
#78📘 EE Pocket Reviewer RojasEasy
The mass of a proton is ____ the mass of an electron.
AEqual to
BLess than
CAbout 1,837 times
DAbout 200 times
#79📘 EE Pocket Reviewer RojasEasy
One “calorie” of heat energy is approximately equivalent to ____ of electrical energy.
A24 watt-sec
B4.2 joules
C860 joules
D3600 watt-hour
#80📘 EE Pocket Reviewer RojasEasy
What type of storage battery generally used in an electric power station?
ALead-acid battery
BCarbon-zinc battery
CNickel-cadmium battery
DLithium-ion battery

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