Short notes
Objective questions (Answers are given below)
- The function of a cycloconverter is to convert
(a) ac power into d.c. power
(b) direct current into alternating current
(c) high ac frequency directly to low ac
frequency
(d) a sine wave into a rectangular wave. - Major disadvantage of using three sets of SCRs
for variable-voltage speed control of a SCIM
is the
(a) considerable I2R loss
(b) poor power factor
(c) long delay of thyristor firing pulses
(d) necessity of using a processor. - In the current-fed frequency converter
arrangement for controlling the speed of an
individual SCIM, the direction of rotation can
be reversed by
(a) changing the output frequency of the
inverter
(b) altering the phase sequence of pulses that
trigger converter-2
(c) interchanging any two line leads
(d) reversing the d.c. link current. - In the chopper speed control method for a
WRIM, the motor speed inversely depends on
(a) fixed resistor across the rectifier
(b) chopper switching frequency
(c) chopper ON time TON
(d) both (b) and (c). - In the synchronous motor drive using currentfed
dc link
(a) converter-2 functions as a selfcommutated
inverter
(b) converter-1 works as an uncontrolled
rectifier
(c) converter-3 is a controlled rectifier
(d) gate triggering of converter-2 is done at
motor frequency. - In the three cycloconverter drive of a
synchronous motor
(a) each cycloconverter produces a 3-phase
output
(b) all cycloconverters act as voltage sources
(c) a 3-phase controlled rectifier provides
field exciting current.
(d) air-gap flux is kept constant by controlling
stator currents only
1.(c) 2. (a) 3. (b) 4. (d) 5. (d) 6. (c)
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