Semiconductor Devices and Diodes Quiz

Semiconductor Devices and Diodes Quiz: Test Your Knowledge of Semiconductor Physics and Rectification

Atoms within a semiconductor crystal are held together by

(a) atomic glue
(b) subatomic particles
(c) covalent bonds
(d) the valence band
Answer: (c) covalent bonds

Free electrons exist in the

(a) valence band
(b) conduction band
(c) lowest band
(d) recombination band
Answer: (b) conduction band

A hole is

(a) a vacancy in the valence band left by an electron
(b) a vacancy in the conduction band
(c) a positive electron
(d) a conduction band electron
Answer: (a) a vacancy in the valence band left by an electron

The process of adding impurity atoms to a pure semiconductor is called

(a) recombination
(b) crystalization
(c) bonding
(d) doping
Answer: (d) doping

The two types of current in a semiconductor are

(a) positive current and negative current
(b) electron current and conventional current
(c) electron current and hole current
(d) forward current and reverse current
Answer: (c) electron current and hole current

The majority carriers in an n-type semiconductor are

(a) electrons
(b) holes
(c) positive ions
(d) negative ions
Answer: (a) electrons

The pn junction is found in

(a) diodes
(b) silicon
(c) all semiconductive material
(d) answers (a) and (b)
Answer: (d) answers (a) and (b)

In a diode, the region near the pn junction consisting of positive and negative ions is called the

(a) neutral zone
(b) recombination region
(c) depletion region
(d) diffusion area
Answer: (c) depletion region

A fixed dc voltage that sets the operating condition of a semiconductive device is called the

(a) bias
(b) depletion voltage
(c) battery
(d) barrier potential
Answer: (a) bias

In a diode, the two bias conditions are

(a) positive and negative
(b) blocking and nonblocking
(c) open and closed
(d) forward and reverse
Answer: (d) forward and reverse

When a diode is forward-biased, it is

(a) blocking current
(b) conducting current
(c) similar to an open switch
(d) similar to a closed switch
(e) answers (a) and (c)
(f) answers (b) and (d)
Answer: (b) conducting current

The voltage across a forward-biased silicon diode is approximately

(a) 0.7 V
(b) 0.3 V
(c) 0 V
(d) dependent on the bias voltage
Answer: (a) 0.7 V

The process of converting ac to pulsating dc is called

(a) clipping
(b) charging
(c) rectification
(d) filtering
Answer: (c) rectification

The output frequency of a half-wave rectifier with a 60 Hz sinusoidal input is

(a) 30 Hz
(b) 60 Hz
(c) 120 Hz
(d) 0 Hz
Answer: (b) 60 Hz

The number of diodes used in a half-wave rectifier is

(a) one
(b) two
(c) three
(d) four
Answer: (a) one

If a 75 V peak sine wave is applied to a half-wave rectifier, the peak inverse voltage across the diode is

(a) 75 V
(b) 150 V
(c) 37.5 V
(d) 0.7 V
Answer: (b) 150 V

The output frequency of a full-wave rectifier with a 60 Hz sinusoidal input is

(a) 30 Hz
(b) 60 Hz
(c) 120 Hz
(d) 0 Hz
Answer: (c) 120 Hz

Two types of full-wave rectifier are

(a) single diode and dual diode
(b) primary and secondary
(c) forward-biased and reverse-biased
(d) center-tapped and bridge
Answer: (d) center-tapped and bridge

When a diode in a center-tapped rectifier opens, the output is

(a) 0 V
(b) half-wave rectified
(c) reduced in amplitude
(d) unaffected
Answer: (a) 0 V

During the positive half-cycle of the input voltage in a bridge rectifier,

(a) one diode is forward-biased
(b) all diodes are forward-biased
(c) all diodes are reverse-biased
(d) two diodes are forward-biased
Answer: (b) all diodes are forward-biased

The process of changing a half-wave or a full-wave rectified voltage to a constant dc voltage is called

(a) filtering
(b) ac to dc conversion
(c) damping
(d) ripple suppression
Answer: (b) ac to dc conversion

The small variation in the output voltage of a dc power supply is called

(a) average voltage
(b) surge voltage
(c) residual voltage
(d) ripple voltage
Answer: (d) ripple voltage

The zener diode is designed to operate in

(a) zener breakdown
(b) forward bias
(c) saturation
(d) cutoff
Answer: (a) zener breakdown

Zener diodes are sometimes used as

(a) current limiters
(b) power distributors
(c) voltage references
(d) variable resistors
Answer: (c) voltage references

Varactor diodes are used as variable

(a) resistors
(b) current sources
(c) inductors
(d) capacitors
Answer: (d) capacitors

LEDs are based on the principle of

(a) forward bias
(b) electroluminescence
(c) photon sensitivity
(d) electron-hole recombination
Answer: (b) electroluminescence

In a photodiode, light produces

(a) reverse current
(b) forward current
(c) electroluminescence
(d) dark current
Answer: (b) forward current

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