Short notes
Objective questions (Answers are given below)
- The main job of a voltage regulator is to provide
a nearly—output voltage.
(a) sinusoidal (b) constant
(c) smooth (d) fluctuating. - A 10-V dc regulator power supply has a regulation
of 0.005 per cent. Its output voltage will
vary within an envelope of ……………….. millivolt.
(a) ± 2.5 (b) ± 0.5
(c) ± 5 (d) ± 0.05 - An ideal voltage regulator has a voltage regulation
of
(a) 1 (b) 100
(c) 50 (d) 0.
- In a Zener diode shunt voltage regulator, the diode
regulates so long as it is kept in …………. condition.
(a) forward (b) reverse
(c) loaded (d) unloaded - The power efficiency of a switching voltage regulator
is much higher than that of a linear regulator
because it operates.
(a) in saturation (b) in cut-off
(c) like a switch (d) on high duty cycle. - A transistor series voltage regulator is called emitter-
follower regulator because the emitter of the
pass transistor follows the ………………. voltage.
(a) output (b) input
(c) base (d) collector
- In an op-amp series voltage regulator, output
voltage depends on
(a) Zener voltage
(b) voltage divider resistors
(c) output voltage
(d) both (a) and (b) - In a feedback series regulator circuit, the output
voltage is regulated by controlling the
(a) magnitude of input voltage
(b) gain of the feedback transistor
(c) reference voltage
(d) voltage drop across the series pass transistor - An op-amp shunt regulator differs from the series
regulator in the sense that its control element
is connected in
(a) series with line resistor
(b) parallel with line resistor
(c) parallel with load resistor
(d) parallel with input voltage. - A switching voltage regulator can be of the following
type :
(a) step-down (b) step-up
(c) inverting (d) all of the above - In an inverting type switching regulator, output
voltage is ……………… input voltage.
(a) lesser than (b) greater than
(c) equal to (d) opposite to. - The output voltage of a step-down type switching
voltage regulator depends on
(a) input voltage (b) duty cycle
(c) transistor on-time(d) all of the above. - As compared to voltage regulators made up of
discrete components, IC regulators have the inherent
advantage/s of
(a) self protection against over-temperature
(b) remote control
(c) current limiting
(d) all of the above
- (b) 2. (a) 3. (d) 4. (b) 5. (c) 6. (c) 7. (d) 8. (d) 9. (a) 10. (d) 11. (d) 12. (d) 13.(d)
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