WorksheetsKaun Banega Electrical Champion?
Total questions: 50
Worksheet time: 29mins
electric energy can be transformed to
radiant energy
thermal energy
mechanical energy
all of the above
Unit of electrical energy is ________.
Meter
Sec
Joule
Watt
Electrical power can be calculated using
Resistance x Voltage
Voltage x Current
Voltage ÷ Current
Voltage + Current
Which of the following Kirchhoff’s law defines incoming and outgoing sum of currents towards node are equal?
KCL
KVL
Voltage Law
Both B and C
The SI unit of electric current
Coulomb (C)
Joule (J)
Ampere (A)
Volt (V)
The SI unit of Electric Potential
Magnetomotive Force
Ampere-Turns
Joule
Volt (V)
The SI unit of electric charge
Ampere (A)
Joule (J)
Coulomb (C)
Volt (V)
.
A component which provides resistance is called
Circuit
Resistor
Cell
Fuse
if two bulbs are connected in parallel and one blows out,what happens to other?
other bulb blows out as well
other bulb continuous to glow
both will be blow out
both will glow
In series, which of parameter remains same across all circuit elements such as resistor,capacitor,inductor?
voltage
current
both voltage and current
neither voltage and current
In series circuit, total resistance Rt is calculated with the formula ____.
Rt = R1 + R2 + R3+...
Rt = R1 - R2 - R3
Rt = 1(R1 + R2 + R3)-1
Both A and B
Kirchhoff's current law states that
Net current flow at the junction is positive
Algebraic sum of the currents meeting at the junction is zero
No current can leave the junction without some current entering it
Total sum of currents meeting at the junction is zero
Ohm’s law is true for
Metallic conductors at low temperature
Metallic conductors at high temperature
For electrolytes, when current passes through them
For diode when current flows
--------- cells are used to harvest solar energy.
Fuel
Photovoltaic
Primary
Secondary
In wind energy harvesting, --------- energy is converted in to electrical energy.
hydro
mechanical
electrical
light
A photovoltaic cell captures ____ to be used for power.
wind
water
coal
sunlight
Moisture content in the soil -----------the earth soil resistance.
increase
decrease
does not affect
none of the above
Which one of the following is used in earth pit:
Aluminum and Iron
Graphite and Silver
Graphite and magnesium
Salt and charcoal
In purely capacitor circuit
Voltage lead current by 180 degree
Voltage lag current by 180 degree
Current lag voltage by 90 degree
Current lead voltage by 90 degree
In pure resistance single phase circuit
Voltage and current are same
voltage and current are in same phase
The power factor is defined as
cosine of the phase difference between voltage and current
ratio of resistance with impedance
ratio of active power with apparent power
All of above
In a three phase, delta connection ——-
line current is equal to phase current
Line voltage is equal to phase voltage
None of the above
Line voltage and line current is zero
Compare three phase and single phase supply
maintenance is same
three phase is more reliable
cost of single phase machine, for same work, is same.
three phase machine is more heavier with its equivalent single phase machine
slip is defined as :
the difference between synchronous speed and rotor speed
the difference between rotor speed and synchronous speed
synchronous speed - rotor speed / rotor speed
(rotor speed - synchronous speed ) / synchronous speed
The rotating part of a motor is
Stator
Rotor
Frame
Bearing
An electrical motor changes electrical energy to ______________ energy
Mechanical
Chemical
Physical
Potential
The alternator stator produces the electrical output. (True/False)
True
False
calculate the frequency of a 8 pole alternator rotated at 900 rpm
(a)
True or False: An alternator produces a Alternating Current (AC).
True
False
Alternators converts ______
mechanical into AC electricity
AC into DC
DC into AC
AC into mechanical Energy
MARK THE PARTS OF TRANSFORMER
CORE
PRIMARY WINDING
SECONDARY WINDING
NONE OF THE ABOVE
EMF EQUATION OF TRANSFORMER IS
E = N x 4.88 f Φm volts
E = N x 4.44 f Φm volts
E = N x 8.88 f Φm volts
E = N x 5.55f Φm volts
If a transformer reduces voltage, it is called a....................... transformer.
step left
step right
step up
step down
Which of the following is an example of appliance using alternating power source?
The transformer is a device used to .......... the value of a voltage.
steady
resist
change
anchor
This picture is an example of a ________________.
Motor
Generator
Step-up transformer
Step-down transformer
What is the principle of operation of a transformer?
Electromagnetic induction
Gravitational force
Nuclear fission
Chemical reaction
The power consumed in a pure inductive circuit is (a)
If power factor = 1, then the current to the load is ______ with the voltage across it.
out of phase
in phase
90⁰ out of phase
45⁰ out of phase
Unit of measurement for frequency
Columb
Hertz
Radians
Peak to Peak Value
Its value is 0.637 times the peak value
Peak to peak value
Instantaneous values
Average value
RMS Value
What is the formula for ohms law?
1+2=3
R X E = I
V =I x R
E= MC squared
Kirchhoff's current law states that
Net current flow at the junction is positive
Algebraic sum of the currents meeting at the junction is zero
No current can leave the junction without some current entering it
Total sum of currents meeting at the junction is zero
Combined resistance of 5 Ω and 10 Ω are connected in series is equal to
10 Ω
15 Ω
20 Ω
25 Ω
What is the voltage Across 3 KΩ?
6 V
3 V
2 V
1 V
