Electrical Engineering Mcqs

Which of the following quantities consists of SI unit as WATT ?

A. Force
B. Charge
C. Current
D. Power

The SI unit of power is the watt and it is discover by the Scottish Engineer James Watt. Power is the rate of consumption of electric energy. So, it is equivalent to joules per second.

Which of the following has no units?

A. Permeability
B. Moment of a magnet
C. Magnetic susceptibility
D Permittivity

Magnetic susceptibility is the degree to which a material is magnetized by an external magnetic field, hence in the SI system it is dimensionless.

Which quantity consists of a unit 1KWh ?

A. Energy
B. Time
C. Power
D. Charge

1 kWh is the amount of energy used by a 1 kW (1000 watt) resistance for 1 hour. Energy = Power × Time.

Which quantity should be measured by the voltmeter ?

A. Current
B. Voltage
C. Power
D. Speed

Voltmeter is a high resistance device used for measuring potential difference or voltage. It must be connected in parallel for measurement

Internal resistance of ideal current source is ?

A. zero
B. infinite
C. finite
B. 100 ohms

Ideal current source delivers energy at specified current, which is independent on voltage across the load. The internal resistance must become very high to deliver maximum current.

Internal resistance of ideal voltage source is ?

A. zero
B. infinite
C. finite
D. 100 ohms

Internal resistance of ideal voltage source is

Capacitor does not allow the sudden change of ?

A. current
B. voltage
C. power
D. None of the above

The expression of current through a capacitor is
For sudden change of voltage infinite current is required. But practically it is not possible.
Practical capacitor circuit has finite value of time constant