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WorksheetsTECH APTI
Total questions: 54
Worksheet time: 45mins
A heater takes a current of 2.77 A from a 220 V supply. What is the resistance?
How much current does a 50 Ω electric iron take if the applied voltage is 250 volt?
A metal filament lamp has a resistance of 55 Ω when cold and 622 Ω when hot. If the lamp works on a 230 V supply. Find: (a) the current at the moment of switching on (b) the current when the lamp has reached its working temperature.
An electromagnet of resistance 12.4 Ω requires a current of 1.5 A to operate. Find the required voltage.
What is an ampere equal to?
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
An EMF source of 8.0 V is connected to a purely resistive electrical appliance. An electric current of 2.0 A flows through it. What is the resistance offered by the electrical appliances?
4 ohm
6 ohm
2 ohm
3 ohm
Kirchhoff's current law is applicable to only
Junction in a network
Closed loops in a network
Electric circuits
Electronic circuits
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
Kirchhoff's voltage law is related to
Junction cards
Battery e.m.fs
IR drops
Both B and C
According to Kirchhoff's voltage law, the algebraic some of all IR drops and e.m.fs. in any closed loop of a network is always
Negative
Positive
Determined by battery e.m.fs.
zero
What is the basic law that has to be followed in order to analyze the circuit?
Newton’s laws
Faraday’s laws
Ampere’s laws
Kirchhoff’s law
KVL is applied in ___________
Mesh analysis
Nodal analysis
Both mesh and nodal
Neither mesh nor nodal
KCL is applied on
Mesh analysis
Nodal analysis
Both mesh and nodal
Neither mesh nor nodal
An ideal independent current source:
Maintains a constant voltage
Maintains a constant current regardless of voltage
Its current depends on circuit resistance
Cannot supply power
Kirchhoff’s Current Law (KCL) states that:
Sum of voltages around a loop is zero
Sum of currents entering a node equals sum of currents leaving
Voltage divides inversely in parallel
Power is constant in any closed loop
Total resistance of series resistors 5Ω, 10Ω, 15Ω is:
15Ω
30Ω
25Ω
10Ω
What does KCL stand for in electrical circuit analysis?
Kirchhoff's Current Law
Kirchhoff's Circuit Law
Kirchhoff's Charge Law
Kirchhoff's Voltage Law
In a circuit, if three currents enter a junction with values of 2 A, 3 A, and 5 A, what is the total current leaving the junction according to KCL?
10 A
5 A
3 A
2 A
Which of the following statements is true regarding Kirchhoff's Voltage Law (KVL)?
Current is constant in series circuits only
Voltage is conserved in parallel circuits only
The sum of all voltages around a closed loop is zero
The sum of all currents entering a node is zero
Component that Convert AC to DC and allow current to flow in one Direction
Capacitor
Diode
Inverter
Resistor
Anode is _________ Polarity in diodes
Negative
Positive
Ground
Hot Side
What type of diode is this?
silicon
LED
Zener
Mylar
Diode has polarity
anode and cathode
on and off
output and input
none of the above
The region on either side of the junction which becomes free from the mobile charge carriers is called
Energy gap region
Charge free region
Diffusion region
Depletion region
Characteristics of a diode that helps in rectification
Allows Unidirectional flow of current
Allows Bidirectional flow of current
Opposes the flow of current
conducts in reverse biased
In the forward bias arrangement of a p-n junction diode,
the n-end is connected to the positive terminal of the battery
the p-end is connected to the positive terminal of the battery
the direction of current is from n-end to p-end in the diode
the p-end is connected to the negative terminal of the battery
which statement is correct? (the dark circles represent the electrons)
p-type of the diode is connected to the negative terminal.
Electron moves across the p-n junction, makes the diode forward biased
current will not flow in the circuit
reverse biased circuit
In the forward bias arrangement of a p-n junction diode,
the n-end is connected to the positive terminal of the battery
the p-end is connected to the positive terminal of the battery
the direction of current is from n-end to p-end in the diode
the p-end is connected to the negative terminal of the battery
The process of adding an impurity to an intrinsic semiconductor is called
Doping
Ionization
Recombination
Atomic modification
What happens to the current in a diode during forward bias?
The current fluctuates randomly.
The current increases significantly.
The current decreases significantly.
The current remains constant.
Describe the behavior of a diode in reverse bias conditions.
A diode in reverse bias allows a large amount of current to flow in the reverse direction.
A diode in reverse bias blocks current flow, allowing only a small leakage current.
A diode in reverse bias conducts current freely without any restriction.
A diode in reverse bias behaves like a short circuit, providing no resistance to current.
List two common applications of rectifier diodes.
Signal modulation circuits
High-frequency amplifiers
Voltage regulators
Power supply circuits, Battery charging applications
Explain the diode current-voltage relationship in the forward region.
The diode current-voltage relationship is quadratic, described by I = aV^2.
The diode current-voltage relationship in the forward region is exponential, described by I = I0 (e^(qV/kT) - 1).
The diode current-voltage relationship is constant regardless of voltage.
The diode current-voltage relationship is linear, described by I = V/R.
What is the significance of the knee voltage or cut-in voltage in a diode's I-V curve?
The knee voltage indicates the reverse bias breakdown voltage of the diode.
The knee voltage indicates the threshold at which a diode starts to conduct current significantly.
The knee voltage is the point where a diode stops conducting current entirely.
The knee voltage represents the maximum voltage a diode can withstand without damage.
This circuit is ...
series circuit
half-wave rectifier
full-wave rectifier
diode breakdown
The process of converting the AC current into DC current is called...
Filtering
Rectification
Smoothing
Step-down
PN Junction diode formed
Special fabrication technique of combining P and N -type material
Pushing P and N- type material towards
Welding of P and N type material
Majority carriers of P type materials
Neutrons
Electrons
Protons
Holes
The depletion region contains
Electrons
Holes
Immobilized charge carriers
Sea of electrons
Resistance developed in the depletion region is
Rforward > Rreverse
Rforward < Rreverse
Rforward = Rreverse
None of these
Main phenomenons associated with formation of p-n junctions are
Drift only
Diffusion only
Diffusion and Drift
only doping
In the forward bias arrangement of a p-n junction diode,
the n-end is connected to the positive terminal of the battery
the p-end is connected to the positive terminal of the battery
the direction of current is from n-end to p-end in the diode
the p-end is connected to the negative terminal of the battery
What type of diode is this?
silicon
LED
Zener
Mylar
Anode is _________ Polarity in diodes
Negative
Positive
Ground
Hot Side
Identify the right semiconductor materials required to construct a diode.
Cathode: P Type, Anode: N Type
Cathode: N Type, Anode: P Type
Cathode: P Type, Anode: P Type
Cathode: N Type, Anode: N Type
Materials which can conduct electricity better than insulator,but not as well as conductors. This is the definition of
diode
semiconductor
conductor
insulator
superconductor
Doping of Semiconductors
materials which can conduct electricity better than insulator, but not as well as conductors.
The process of adding of a certain amount of specific impurities atoms in the pure semiconductor.
when 4 electrons in outermost orbit.
The minority carriers in P-type silicon are called _________________
Neutron
Proton
Electron
Hole
The current in a semiconductor is produced by
electron only
holes only
negative ions
both electrons and holes
What is the most common semiconductor material used for producing integrated circuits
Quartz
Silicon
Diamond
Tantalum
