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The voltage at the input to IC1 will be approximately:
a) 6 V
b) 12 V
c) 13.5 V
d) 16 V.
In the diagram for Question 1, the function of IC1 is:
a) a current amplifier
b) a voltage amplifier
c) a voltage regulator
d) a miniature transformer.
In the diagram for Question 1, the function of C19 is:
a) a timing capacitor
b) a coupling capacitor
c) a reservoir capacitor
d) waveshaping capacitor.
Which one of the following gives the frequency of the ripple produced by a full-wave bridge rectifier when fed from a 50Hz a.c. supply?
a) 25 Hz
b) 50 Hz
c) 100 Hz
d) 200 Hz.
When a power supply is tested, the output voltage falls from 12V on no-load to 10 V when the load current is 1 A. Which one of the following gives the output resistance of the power supply?
a) 0.5 ohm
b) 1 ohm
c) 2 ohm
d) 10 ohm.
Which one of the following is TRUE of the circuit shown below?
a) The circuit acts as a voltage doubler
b) The circuit acts as a voltage regulato
c) The circuit acts as a bi-phase rectifier
d) The circuit acts as a half-wave rectfifier.
The output voltage of a d.c. power supply falls from 20 V to 19 V when the a.c. mains supply voltage is reduced from 220 V to 200 V, Which one of the following gives the regulation of the supply?
a) 0.5 %
b) 1 %
c) 2.5 %
d) 5 %.
The output voltage of a switched mode power supply can be regulated by controlling the:
a) duty cycle
b) input voltage
c) output current
d) switching frequency.
Most switched mode power supplies operate in the frequency range:
a) below 3 kHz
b) 3 kHz to 10 kHz
c) 10 kHz to 30 kHz
d) above 30 kHz.
The advantages of a switched-mode power supply when compared with a conventional linear power supply include:
a) low efficiency and compact size
b) high efficiency and compact size
c) low noise generation and high efficiency
d) high noise generation and low efficiency.
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