9
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IN ANSWERING QUESTIONS 1-64 THROUGH
1-66, MATCH THE ELECTRICAL LETTER
SYMBOL FOR RECTIFIER DIODES IN
COLUMN B TO THE DEFINITION IN
COLUMN A.
A. DEFINITIONS
B. SYMBOLS
1-64.
The maximum reverse
dc voltage that will not
cause breakdown
1.
VR
1-65.
The peak current
specified for a given
number of cycles or
portion of a cycle
2.
ISURGE
1-66.
The average reverse
current at a specified
temperature, usually
60 hertz
3.
4.
IF(AV)
IR(AV)
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1-67. A matching pair of diodes is indicated by
which of the following numbers?
1.
2N325
2. 1N325C
3. 2N325M
4. 1N325M
1-68. The number 3N345 identifies which of the
following semiconductors, if any?
1. Diode
2. Transistor
3. Tetrode transistor
4. None of the above
1-69. What type of diode has green, blue, and
orange bands?
1.
1N463
2.
1N572
3.
1N663
4.
1N563
1-70. One of the prime dangers to the
semiconductor diode is heat. Excessive
current generated by heat which eventually
destroys a diode is called
1. junction overload
2. thermal runaway
3. thermoplastic action
4. thermionic emission
1-71. When replacing a diode in a circuit, which
of the following safety precautions should
you observe in removing the diode from
the circuit?
1. Do not pry the diode from the circuit
2. Do not use excessive heat to remove
the diode
3. Do not remove the diode from the
circuit while voltage is applied
4. All of the above
1-72. As you make a front-to-back ratio check of
a diode with an ohmmeter, your first
measurement (forward) is a low resistance
reading, and your second measurement
(reverse) is also a low reading. What
should be your evaluation of the diode?
1. It is open
2. It is shorted
3. It is good
4. It is leaky
1-73. What are normally the front-to-back ratio
of (a) a power rectifier and (b) a signal
diode?
1. (a) 10:1
(b) 50:1
2. (a) 10:1
(b) 300:1
3. (a) 300:1
(b) 10:1
4. (a) 300:1
(b) 50:1
