Short notes
Objective questions (Answers are given below)
- The ripple factor of a power supply is a
measure of
(a) its filter efficiency
(b) its voltage regulation
(c) diode rating
(d) purity of power output. - The basic reason why a FW rectifier has
twice the efficiency of a HW rectifier is that
(a) it makes use of a transformer
(b) its ripple factor is much less
(c) it utilizes both half-cycle of the input
(d) its output frequency is double the line
frequency. - The output of a half-wave rectifier is suitable
only for
(a) running car radios
(b) running ac motors
(c) charging batteries
(d) running tape-recorders. - The ripple factor of a bridge rectifier is
(a) 0.406 (b) 0.812
(c) 1.21 (d) 1.11
- The ripple factor of a power suply is given
by (symobls have the usual meaning).
(a) (b) (c) - The PIV of a half-wave rectifier circuit with
a shunt capacitor filter is
(a) 2 Vsm (b) Vsm
(c) Vsm/2 (d) 3 Vsm. - The primary function of a rectifier filter is
to
(a) minimise ac input variations
(b) suppress odd harmonics in the rectifier
output
(c) stabilise dc level of the output voltage
(d) remove ripples from the rectified output - In a rectifier, larger the value of shunt
capacitor filter
(a) larger the p-p value of ripple voltage
(b) larger the peak current in the recti- fying
diode
(c) longer the time that current pulse flows
through the diode
(d) smaller the dc voltage across the load. - In a LC filter, the ripple factor,
(a) increases with the load current
(b) increases with the load resistance
(c) remains constant with the load current
(d) has the lowest value. - The main reason why a bleeder resistor is
used in a dc power supply is that it
(a) keeps the supply ON
(b) improves voltage regulation
(c) improves filtering action
(d) both (b) and (c). - Which stage of a dc power supply uses a
Zener as the main component?
(a) rectifier (b) voltage divider
(c) regulator (d) filter. - Which rectifier requires four diodes ?
(a) half-wave voltage doubler
(b) full-wave voltage doubler
(c) full-wave bridge circuit
(d) voltage quadrupler. - For a half-wave controlled rectifier, the average
value of output dc voltage is given by
(a) Vdc =
2
m V
π
(1 − cos θ1)
(b) Vdc =
2 m V
π
(1 + cos θ1)
(c) Vdc = m V
π
(cos θ1 − 1)
(d) Vdc =
2
m V
π
(cos θ1 + 1). - If, by mistake, ac source in a bridge rectifier
is connected across the dc termi- nals, it
will burn out and hence short …….. diodes.
(a) one (b) two
(c) three (d) four.
- (a) 2. (c) 3. (b) 4. (c) 5. (b) 6. (a) 7. (d) 8. (b) 9. (c) 10. (d) 11. (c) 12.(b) 13. (c) 14. (d)
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