NRTC 14178A SPECIAL PURPOSE TUBES
LATEST EXAM QUESTIONS AND CORRECT
ANSWERS
which of the following types of tubes would be used as a voltage amplifier in an electronic
circuit
triode
multielectrode tubes are normally classified according to the number of
grids contained in the tube
how many grids are there in a pentagrid tube
five
which of the following diagram represents a twin pentode
1
which of the following diagrams represents a twin-input triode
4
what advantages does the in-line grid arrangement of the power pentode have over the
staggered grid arrangement of the conventional pentode
both 1 and 2 above
which of the following is an advantage that a power pentode has over a conventional
pentode
greater sensitivity to small signals
what is the primary purpose of the beam-forming plates in the beam-power tube
to concentrate the electrons into a beam
which of the following is a name given to the variable-mu table
remote-cutoff tube
what is the symbol for mu
1
which of the following is an advantage of the variable-mu tube over conventional tubes
it can amplify large input signals without distortion
what is the only difference between a remote-cutoff tube and a sharp-cutoff tube
, the spacing of the grid wires
which of the following is the best method for reducing transit time in uhf tubes
placing the elements very close together
which of the following is a disadvantage to uhf tubes
they have reduced power-handling capabilities
what is the only physical difference between the doorknob tube and the acorn tube
size
how does the construction of a planar tube differ from that os a concentric tube
the electrodes of the planar tubes are parallel to each other while those in concentric tubes are not
why is the metallic ring of the planar tube grounded
to eliminate unwanted rf signals
the metallic shell capacitive ground of a planar tube serves as what kind of capacitor in a
cathode-bias circuit
bypass
what is the major difference between the oilcan tube and the lighthouse tube
the oilcan tube has cooling fins;the lighthouse tube does not
which of the following is an advantage that an oilcan tube has over a lighthouse tube
the oilcan tube can handle more power
the plate potential at which ionization occurs is known as the ionization point. which of the
following is also a name for this process
firing potential
what name is given to the value of plate voltage at which ionization stops
extinction potential
when a gas-filled triode ionizes, the grid loses control and the tube the functions as what
type of tube
diode
after the gas-filled triode ionizes and the grid loses control, which of the following methods
is used to stop the conduction of the tube
removing the plate potential
what is the name given to the gas-filled triode
LATEST EXAM QUESTIONS AND CORRECT
ANSWERS
which of the following types of tubes would be used as a voltage amplifier in an electronic
circuit
triode
multielectrode tubes are normally classified according to the number of
grids contained in the tube
how many grids are there in a pentagrid tube
five
which of the following diagram represents a twin pentode
1
which of the following diagrams represents a twin-input triode
4
what advantages does the in-line grid arrangement of the power pentode have over the
staggered grid arrangement of the conventional pentode
both 1 and 2 above
which of the following is an advantage that a power pentode has over a conventional
pentode
greater sensitivity to small signals
what is the primary purpose of the beam-forming plates in the beam-power tube
to concentrate the electrons into a beam
which of the following is a name given to the variable-mu table
remote-cutoff tube
what is the symbol for mu
1
which of the following is an advantage of the variable-mu tube over conventional tubes
it can amplify large input signals without distortion
what is the only difference between a remote-cutoff tube and a sharp-cutoff tube
, the spacing of the grid wires
which of the following is the best method for reducing transit time in uhf tubes
placing the elements very close together
which of the following is a disadvantage to uhf tubes
they have reduced power-handling capabilities
what is the only physical difference between the doorknob tube and the acorn tube
size
how does the construction of a planar tube differ from that os a concentric tube
the electrodes of the planar tubes are parallel to each other while those in concentric tubes are not
why is the metallic ring of the planar tube grounded
to eliminate unwanted rf signals
the metallic shell capacitive ground of a planar tube serves as what kind of capacitor in a
cathode-bias circuit
bypass
what is the major difference between the oilcan tube and the lighthouse tube
the oilcan tube has cooling fins;the lighthouse tube does not
which of the following is an advantage that an oilcan tube has over a lighthouse tube
the oilcan tube can handle more power
the plate potential at which ionization occurs is known as the ionization point. which of the
following is also a name for this process
firing potential
what name is given to the value of plate voltage at which ionization stops
extinction potential
when a gas-filled triode ionizes, the grid loses control and the tube the functions as what
type of tube
diode
after the gas-filled triode ionizes and the grid loses control, which of the following methods
is used to stop the conduction of the tube
removing the plate potential
what is the name given to the gas-filled triode
