4th Class Power Engineering Unit A8: Basic Concepts in Electrotechnology Questions With COMPLETE sOLUTIONS

4th Class Power Engineering Unit A8: Basic Concepts in Electrotechnology Questions With
COMPLETE sOLUTIONS




A typical extra low voltage device would be a:

Select one:

a. toaster

b. set of tree lights

c. door bell

d. residential lighting - (ANSWER)c



As back EMF decreases the net armature EMF:

Select one:

a. remains constant

b. decreases

c. increases

d. decreases amount of armature current - (ANSWER)c



Prior to using a voltage meter, what must be known:

Select one:

a. type of current

b. type of meter

c. expected measured value

d. if circuit is open or not - (ANSWER)c



A property of a magnet, is that it will always point in the north direction:

Select one:

a. freely suspended in the air

b. charged with electricity

c. it is demagnetized

d. in the presence of iron filings - (ANSWER)a

,4th Class Power Engineering Unit A8: Basic Concepts in Electrotechnology Questions With
COMPLETE sOLUTIONS




An ampere is the _________ of current flow:

Select one:

a. cause

b. resistance

c. measurement

d. reluctance - (ANSWER)c



Current transformers step down the current rather than the:

Select one:

a. resistance

b. voltage

c. conductance

d. number of poles - (ANSWER)b



Three phase systems often use__________ to replace three-phase transformers:

Select one:

a. capacitors

b. pancake windings

c. Sandwich windings

d. banks of single-phase - (ANSWER)d



Test meters come in 2 basic types, digital and:

Select one:

a. pneumatic

b. DMM

c. analogue

,4th Class Power Engineering Unit A8: Basic Concepts in Electrotechnology Questions With
COMPLETE sOLUTIONS




d. LCD - (ANSWER)c



A moving conductor is at an angle of 90 degrees within the magnetic field:

Select one:

a. maximum resistance to current flow is attained

b. current will flow with the least resistance

c. motor action will be experienced

d. voltage generated will be at its maximum - (ANSWER)d



The flow of electrons in a uniform direction from atom to atom through a circuit is known as:

Select one:

a. electromotive force

b. potential difference

c. a short circuit

d. current - (ANSWER)d



The magnetic field in a DC machine may be supplied by permanent magnets in small units. Large DC
machines use field poles that are essentially:

Select one:

a. insulators

b. resistors

c. non-magnetic

d. electromagnets - (ANSWER)d



Three resistors of 170 ohms, 9 ohms, and 570 ohms are connected in series. Determine the total
equivalent resistance:

Select one:

a. 391 ohms

, 4th Class Power Engineering Unit A8: Basic Concepts in Electrotechnology Questions With
COMPLETE sOLUTIONS




b. 749 ohms

c. 7490 ohms

d. 3910 ohms - (ANSWER)b



The property which determines whether or not a material will be easily magnetized is called:

Select one:

a. reaction

b. conductivity

c. permeability

d. magnetism - (ANSWER)c



Ammeters are connected with the negative or black lead connected to the:

Select one:

a. positive side of the circuit

b. parallel side of the circuit

c. negative side of the circuit

d. switch of the circuit - (ANSWER)c



The strength of the magnetic field produced in a shunt wound generator:

Select one:

a. is weak

b. is fairly constant

c. fluctuates

d. is regulated by an external AC supply - (ANSWER)b



Three major losses which occur in a transformer are iron losses, copper losses and:

Select one: