Chapter 18 Basic Electrical Engineering

Question 1

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

Answer 1

D. None of the above

Question 2

In power station practice “spinning reverse” is

Answer 2

B. Reverse generating capacity what is connected to bus and ready to take load

Question 3

Turnaround efficiency of battery energy storage system is about

Answer 3

A. 75 percent

Question 4

Most of the generators in the thermal power plants run at

Answer 4

B. 1500 rpm

Question 5

The power supplied to domestic consumers is at 220v. This represents

Answer 5

RMS value of voltage

Question 6

The conductors that are used for transmitting bulk of power at high voltage are typically made out of this material

Answer 6

D. Copper

Question 7

When a conductor is suspended between two supports at the same level its shape becomes

Answer 7

A. Catenary

Question 8

Sag is provided in overhead transmission lines so that

Answer 8

D. Safe tension is not exceeded

Question 9

The string efficiency in an AC system is

Answer 9

70.7%

Question 10

Satellites are powered by

Answer 10

A. Solar cells

Question 11

A ship is powered by

Answer 11

C. Steam turbines or diesel engine

Question 12

Which of the following plant is suitable for peak load

Answer 12

A. Diesel engine plant

Question 13

The term “critical” is associated with power plant of the type

Answer 13

D. Nuclear power plant

Question 14

A turbocharger is a part of

Answer 14

B. Diesel engine power plant

Question 15

Which of the following plant has least pollution problem

Answer 15

D. Hydro electric power plant

Question 16

Which of the following power plant can be installed within the shortest time

Answer 16

D. Diesel engine power plant

Question 17

Which of the following device consumes least power

A. Toaster
B. Desert cooler
C. Electric shaver
D. Electric iron

Answer 17

C. Electric shaver

Question 18

Which of the following needs highest levels of illumination

Answer 18

A. Proof reading

Question 19

The lamp that is used for cinema projectors is a

Answer 19

D. Carbon arc lamp

Question 20

In a fluorescent tube circuit, choke acts as a

Answer 20

B. A device for improving the power factor

Question 21

Transient disturbances are due to

A. Switching operations
B. Load variations
C. Faults
D. Any of the above

Answer 21

D. Any of the above

Question 22

Bottoming cycle is quite common in

Answer 22

A. Cement plants

Question 23

Which of the following is the most highly developed device for confining plasma with magnetic field

Answer 23

A. Tokamak

Question 24

Fuses and circuit breakers do not protect electric motors from

Answer 24

D. Overheating

Question 25

Corona generally results in

A. Violet glow
B. Hissing noise
C. Production of ozone gas
D. All of the above

Answer 25

D. All of the above

Question 26

Which of the following affects corona

A. Conductor size
B. Spacing between conductors
C. Line voltage
D. All of the above

Answer 26

D. All of the above

Question 27

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

Answer 27

C. The Heisenberg uncertainty principle

Question 28

The phenomenon of physical adhesion of molecules of the surfaces of solids without chemical reaction is

Answer 28

B. Absorption

Question 29

In which of the following systems where Betz Law is widely used

Answer 29

D. Wind mills

Question 30

What is the unit of electromagnetic wave frequency

Answer 30

C. Hertz