Chapter 18 Basic Electrical Engineering Flashcards
Ebb current refers to
A. The eddy current
B. The movement of the tidal current away from shore or down a tidal stream
C. The removal by screen of undesirable fine materials from broken ore
D. None of the above
D. None of the above
In power station practice “spinning reverse” is
B. Reverse generating capacity what is connected to bus and ready to take load
Turnaround efficiency of battery energy storage system is about
A. 75 percent
Most of the generators in the thermal power plants run at
B. 1500 rpm
The power supplied to domestic consumers is at 220v. This represents
RMS value of voltage
The conductors that are used for transmitting bulk of power at high voltage are typically made out of this material
D. Copper
When a conductor is suspended between two supports at the same level its shape becomes
A. Catenary
Sag is provided in overhead transmission lines so that
D. Safe tension is not exceeded
The string efficiency in an AC system is
70.7%
Satellites are powered by
A. Solar cells
A ship is powered by
C. Steam turbines or diesel engine
Which of the following plant is suitable for peak load
A. Diesel engine plant
The term “critical” is associated with power plant of the type
D. Nuclear power plant
A turbocharger is a part of
B. Diesel engine power plant
Which of the following plant has least pollution problem
D. Hydro electric power plant
Which of the following power plant can be installed within the shortest time
D. Diesel engine power plant
Which of the following device consumes least power
A. Toaster
B. Desert cooler
C. Electric shaver
D. Electric iron
C. Electric shaver
Which of the following needs highest levels of illumination
A. Proof reading
The lamp that is used for cinema projectors is a
D. Carbon arc lamp
In a fluorescent tube circuit, choke acts as a
B. A device for improving the power factor
Transient disturbances are due to
A. Switching operations
B. Load variations
C. Faults
D. Any of the above
D. Any of the above
Bottoming cycle is quite common in
A. Cement plants
Which of the following is the most highly developed device for confining plasma with magnetic field
A. Tokamak
Fuses and circuit breakers do not protect electric motors from
D. Overheating
Corona generally results in
A. Violet glow
B. Hissing noise
C. Production of ozone gas
D. All of the above
D. All of the above
Which of the following affects corona
A. Conductor size
B. Spacing between conductors
C. Line voltage
D. All of the above
D. All of the above
The statement that the product of the error in the measured determination of a particle’s position and its momentum is of the order of Plank’s constant “h” is known as
C. The Heisenberg uncertainty principle
The phenomenon of physical adhesion of molecules of the surfaces of solids without chemical reaction is
B. Absorption
In which of the following systems where Betz Law is widely used
D. Wind mills
What is the unit of electromagnetic wave frequency
C. Hertz
