CETa UPDATED EXAM FINAL PAPERS QUESTIONS AND
ANSWERS GRADED A+
✔✔With three 2.5k resistors and one 3.4k resistor in parallel, the total resistance is:
A.
668.81k Ohms.
B.
66.29 Ohms.
C.
669.29 Ohms
D.
670.50k Ohms. - ✔✔C.
669.29 Ohms
✔✔With one series 8 Ohm resistor connected to two in-parallel resistors, 20 and 30
ohms respectively, what is the total resistance (Rt)?
A.
38 Ohms
B.
30 Ohms
C.
20 Ohms
D.
8 Ohms - ✔✔C.
20 Ohms
✔✔Given a battery rated at 350 ampere-hours how many hours will the battery be able
to provide 7 amperes?
A.
25
B.
35
C.
50
D.
17.5 - ✔✔C.
50
✔✔The basic properties associated with alternating voltage and current are:
A.
frequency, period, wavelength and amplitude.
B.
frequency, deviation, wavelength and amplitude.
C.
magnitude, period, wavelength and amplitude.
,D.
frequency, period, designation and amplitude. - ✔✔A.
frequency, period, wavelength and amplitude.
✔✔In an inductor/coil inductance varies as the _______ of the number of turns.
A.
Cube
B.
Square
C.
Inverse
D.
Log - ✔✔B.
Square
✔✔Two basic uses for transformers are:
A.
power supplies and bias control.
B.
signal matching and power supplies.
C.
signal matching and voltage regulation.
D.
voltage regulation and rectification. - ✔✔B.
signal matching and power supplies.
✔✔What is meant by "transformer action"?
A.
The action in which an expanding and contracting magnetic field around the primary
winding cuts the secondary winding and induces a direct voltage into the winding
B.
The transfer of energy from one circuit to another circuit by magnetic rectification
C.
The transfer of load voltage to the center-tapped secondary through capacitance
D.
The transfer of energy from one circuit to another circuit by electromagnetic induction -
✔✔D.
The transfer of energy from one circuit to another circuit by electromagnetic induction
✔✔What are the three basic parts of a transformer?
A.
Primary winding, dielectric and core
B.
Primary winding, secondary winding and core
C.
, Primary winding, power diode and secondary winding
D.
Primary winding, secondary winding and tertiary winding - ✔✔B.
Primary winding, secondary winding and core
✔✔The time required to charge a capacitor to 63 percent is known as:
A.
Thevenin's constant.
B.
a time constant.
C.
a linear superposition.
D.
Tau. - ✔✔B.
a time constant.
✔✔Calculate the capacitive reactance for 440 Hz and 9µF.
A.
44 Ohms
B.
.02 Ohms
C.
37.37 Ohms
D.
40.21 Ohms - ✔✔D.
40.21 Ohms
✔✔In a resistive-capacitive circuit the vector line relationship shows two lines
perpendicular to each other. What is the phase relationship?
A.
In phase
B.
Out of phase
C.
180 degree difference
D.
90 degree - ✔✔D.
90 degree
✔✔In a capacitive circuit, what is the voltage and current relationship?
A.
Current lags
B.
Voltage lags
C.
ANSWERS GRADED A+
✔✔With three 2.5k resistors and one 3.4k resistor in parallel, the total resistance is:
A.
668.81k Ohms.
B.
66.29 Ohms.
C.
669.29 Ohms
D.
670.50k Ohms. - ✔✔C.
669.29 Ohms
✔✔With one series 8 Ohm resistor connected to two in-parallel resistors, 20 and 30
ohms respectively, what is the total resistance (Rt)?
A.
38 Ohms
B.
30 Ohms
C.
20 Ohms
D.
8 Ohms - ✔✔C.
20 Ohms
✔✔Given a battery rated at 350 ampere-hours how many hours will the battery be able
to provide 7 amperes?
A.
25
B.
35
C.
50
D.
17.5 - ✔✔C.
50
✔✔The basic properties associated with alternating voltage and current are:
A.
frequency, period, wavelength and amplitude.
B.
frequency, deviation, wavelength and amplitude.
C.
magnitude, period, wavelength and amplitude.
,D.
frequency, period, designation and amplitude. - ✔✔A.
frequency, period, wavelength and amplitude.
✔✔In an inductor/coil inductance varies as the _______ of the number of turns.
A.
Cube
B.
Square
C.
Inverse
D.
Log - ✔✔B.
Square
✔✔Two basic uses for transformers are:
A.
power supplies and bias control.
B.
signal matching and power supplies.
C.
signal matching and voltage regulation.
D.
voltage regulation and rectification. - ✔✔B.
signal matching and power supplies.
✔✔What is meant by "transformer action"?
A.
The action in which an expanding and contracting magnetic field around the primary
winding cuts the secondary winding and induces a direct voltage into the winding
B.
The transfer of energy from one circuit to another circuit by magnetic rectification
C.
The transfer of load voltage to the center-tapped secondary through capacitance
D.
The transfer of energy from one circuit to another circuit by electromagnetic induction -
✔✔D.
The transfer of energy from one circuit to another circuit by electromagnetic induction
✔✔What are the three basic parts of a transformer?
A.
Primary winding, dielectric and core
B.
Primary winding, secondary winding and core
C.
, Primary winding, power diode and secondary winding
D.
Primary winding, secondary winding and tertiary winding - ✔✔B.
Primary winding, secondary winding and core
✔✔The time required to charge a capacitor to 63 percent is known as:
A.
Thevenin's constant.
B.
a time constant.
C.
a linear superposition.
D.
Tau. - ✔✔B.
a time constant.
✔✔Calculate the capacitive reactance for 440 Hz and 9µF.
A.
44 Ohms
B.
.02 Ohms
C.
37.37 Ohms
D.
40.21 Ohms - ✔✔D.
40.21 Ohms
✔✔In a resistive-capacitive circuit the vector line relationship shows two lines
perpendicular to each other. What is the phase relationship?
A.
In phase
B.
Out of phase
C.
180 degree difference
D.
90 degree - ✔✔D.
90 degree
✔✔In a capacitive circuit, what is the voltage and current relationship?
A.
Current lags
B.
Voltage lags
C.
