Basic Electrical Engineering MCQs (Part-8)

What is the relationship between power, voltage, and current in a DC circuit?

A \( P = V/I \)
B \( P = VI \)
C \( P = I^2V \)
D \( P = V^2I \)

What happens to the total capacitance when capacitors are connected in parallel?

A It increases
B It decreases
C It remains constant
D It becomes zero

What is the primary advantage of an AC system over a DC system for power transmission?

A Lower voltage
B Easier to convert voltages using transformers
C No energy loss
D Constant current flow

Which of the following is a non-ohmic device?

A Copper wire
B Resistor
C Filament bulb
D Aluminum wire

What is the unit of electric charge?

A Joule
B Ampere
C Coulomb
D Watt

What is the effect of temperature on the resistance of a semiconductor?

A Resistance increases with temperature
B Resistance decreases with temperature
C Resistance remains constant
D Resistance becomes infinite

Which device is used to measure the frequency of an AC signal?

A Voltmeter
B Ammeter
C Oscilloscope
D Ohmmeter

What type of loss occurs in a transformer due to the repeated magnetization and demagnetization of the core?

A Copper loss
B Eddy current loss
C Hysteresis loss
D Dielectric loss

What is the role of a load in an electrical circuit?

A To store energy
B To consume power
C To increase current
D To generate voltage

What is the relationship between magnetic flux density (\( B \)) and magnetic field strength (\( H \)) in a material?

A \( B = H/I \)
B \( B = \mu H \)
C \( B = H \times \mu_0 \)
D \( B = I \times H \)

Which device is used to test the polarity of a DC circuit?

A Ammeter
B Test lamp
C Multimeter
D Voltmeter

What is the primary purpose of grounding in electrical systems?

A To increase voltage
B To protect devices from surges and shocks
C To amplify current
D To reduce resistance

What is the typical range of power factor in industrial applications?

A 0.1 to 0.5
B 0.5 to 1.0
C -1.0 to 0
D 0 to 0.2

Which type of transformer winding is connected to the load?

A Primary winding
B Secondary winding
C Tertiary winding
D Core winding

What is the effect of increasing the number of turns in a solenoid?

A Decreases magnetic field strength
B Increases magnetic field strength
C Reduces current
D Increases resistance

What is the frequency of AC supply in India?

A 50 Hz
B 60 Hz
C 100 Hz
D 25 Hz

What is the purpose of a relay in electrical circuits?

A To measure current
B To amplify voltage
C To control a circuit remotely
D To reduce resistance

What is the SI unit of inductance?

A Henry
B Weber
C Tesla
D Joule

Which property of a conductor determines its ability to resist current flow?

A Conductivity
B Permeability
C Resistivity
D Dielectric strength

What is the primary function of a rheostat?

A To increase resistance
B To adjust current flow
C To reduce voltage
D To step down power