Electronic Test 3 Volume 1

1. What is the opposition to the creation of
magnetic lines of force?
A. Permeance
(B) Reluctance
C. Impedance
D. Elastance
2. If the value of the upper resistance limit of a
resistor is 10.5 Ω, what is its color coding.
A. Black, Brown, Brown, Gold
(B) Brown, Black, Black, Gold
C. Black, Blue, Brown, Gold
D. Brown, Black, Brown, Gold
3. Which of the following are the common uses
of zener diodes?
A. Rectifies
B. Switches
(C) Regulators
D. Amplifiers
4. If the current flows from positive to negative, it is
said to be a
(A) conventional current
B. drift current
C. convection current
D. an electron current
5. MOSPET and BJT are respectively controlled by
A. current and voltage
(B) voltage and current
C. both current
D. both voltage
6. ______is a current that flows in the core of a
transformer that produces heat.
A. Convention current
B. Conventional current
(C) Eddy current
D. Hysteresis
7. Which law determines the polarity of induced
voltage?
A. Ohm’s law
B. Coulomb’s law
C. Joule’s law
(D) Lenz’s law
8. DIAC is another term for a
A. two-layer diode
B. three-layer diode
(C) four-layer diode
D. five-layer diode
9. _______ are the particles that make up the
lattice in an ionic crystal.
(A) Ions
B. Protons
C. Electrons
D. Positrons
10. What is the measure of the consistency or
repeatability of measurement?
A. Error
B Accuracy
(C)Precision
D. Exactness
11. What should be used to clean a dirty tape
head?
A. Oil
B. Ferric chloride solution
(C) Isopropyl alcohol
D. Water
12. What is the property of a magnetic material
which retains magnetism even after the
withdrawal of magnetizing force?
A. Permeability
B. Permittivity
C. Reluctivity
(D) Retentivity
13. A power found by multiplying the sine of the
phase angle, the effective source voltage and
the effective source current.
A. Real power
B. Apparent power
(C) Reactive power
D. Dissipated power
14. Which is the maximum efficiency of half wave
Rectification?
A. 76 %
(B) 41 %
C. 82 %
D. 33 %
15. A characteristic of a cascaded amplifier.
(A) Overall gain is increased.
B. Overall gains is doubled.
C. Overall gain is multiplied.
D. Overall gain is decreased.



16. When a diac is added with one more
Terminal, it becomes
A. an SCR
(B) a triac
C. a thyristor
D. a quadric
17. ______is defined as the ration of required
input signal to the amount of deflection.
A.Viscousity
B. Relatively
(C) Sensitivity
D. Fidelity
18. What is the lagging effect between flux
density of the material and the magnetizing
force applied?
A. Magnetization
B. Retentivity
(C) Hysteresis
D. Reluctivity
19. Crystal have very
A. low quality factor
(B) high quality factor
C. low resistance
D. high resistance
20. Silicon resistivity is about
A. 100 Ω -mm
(B) 100 Ω -cm
C. 100 Ω -m
D. 100 Ω -dm
21. Refreshing is the periodic charging of a
______ cell.
A. solar
(B) dynamic
C. static
D. photovoltaic
22. ______is an emf induced when a conductor
is stationary and the magnetic field is moving
or changing.
A. Self-induced emf
B. Dynamically induced emf
C. Mutually induced emf
(D) Statically induced emf

23. Is a term used to express the ration of change
in the dc collector current to the change in the
base current in a bipolar transistor.
(A) Beta
B. Gamma
C. Alpha
D. Delta
24. What gaseous tube which uses a pool of
liquid mercury as its cathode?
A. Klystron
B. TWT
C. Thyratron
(D) Phanotron
25. What element whose nuclei contains the
Most tightly bound nucleons?
(A) Iron
B. Copper
C. Helium
D. Hydrogen
26. What is the unit of reluctance?
A. Oersted
B. Gilbert
(C) At/Wb
D. Maxwell
27. _______ is the emission of electrons from hot
bodies.
(A) Edison effect
B. Radiation effect
C. Hall effect
D. Peltier effect
28. A diagram showing procedures which are
Followed and acted upon.
A. Block diagram
B. Schematic diagram
C. Algorithm
(D) Flow chart
29. What is the simplest and commonly used
method to switch off an SCR?
A. Reverse gate voltage application
B. Forced-commutation technique
(C) Anode-current interruption
D. Forward gate voltage application

30. Positive feedback
(A) increases gain and distortion
B. increases bandwidth
C. reduces distortion
D. reduces gain