A dc to dc transistor chopper supplied from a fixed voltage dc source feeds a fixed resistive-inductive load and a free-wheeling diode. The chopper operates at 1 kHz and 50% duty cycle. Without changing the value of the average dc current through the load, if it is desired to reduce the ripple content of load current, the control action needed will

increases chopper frequency and duty cycle in equal ratio

increase chopper frequency keeping the duty cycle constant

increases chopper frequency and duty cycle in equal ratio

decrease only the chopper frequency

A dc to dc transistor chopper supplied from a fixed voltage dc source

1.	A dc to dc transistor chopper supplied from a fixed voltage dc source feeds a fixed resistive-inductive load and a free-wheeling diode. The chopper operates at 1 kHz and 50% duty cycle. Without changing the value of the average dc current through the load, if it is desired to reduce the ripple content of load current, the control action needed will
A.	increase chopper frequency keeping the duty cycle constant
B.	increases chopper frequency and duty cycle in equal ratio
C.	decrease only the chopper frequency
D.	decrease only the duty cycle
Answer» B. increases chopper frequency and duty cycle in equal ratio

Discussion

No Comment Found

Related MCQs

A single-phase voltage source inverter is controlled in a single pulse-width modulated mode with a pulse width of 150 in each half cycle. Total harmonic distortion is defined asTHD = Vrms - V1 100V1where V1 is the rms value of the fundamental component of the output voltage. The THD of output ac voltage wave form is
An UJT used for triggering an SCR has the supply voltage VBB = 25 V. The intrinsic stand off ratio, = 0.75. The UJT will conduct when the bias voltage Vz is
For a sinusoidal input voltage, Vs = Vm sin t = 2 Vs sin t if the input voltage is connected to load for n cycles and is disconnected for m cycles, then rms output voltage is given by Vo = Vs K where duty cycle K is given by
If a positive voltage is applied to the gate of a reverse biased SCR, then
MOS controlled thyristors have 1. Low forward voltage drop during conduction 2. Fast turn-on and turn-off time 3. Low switching losses 4. High reverse voltage blocking capability 5. Low gate input impedance Of these statements
Consider the following statements : The overlap angle of a phase-controlled converter would increase on increasing 1. supply voltage 2. supply frequency 3. load current 4. source inductanceOf these statements
A single-phase AC regulator with an inductance load has following details : Source voltage, 230 V, at a frequency of 50 Hz and L = 5 ohms. The control range of the firing angle is
A fully controlled natural commutated 3-phase bridge rectifier is operating with a firing angle = 30 . The peak to peak voltage ripple expressed as a ratio of the peak output dc voltage at the output of the converter bridge is
A voltage commutated chopper has the following parameters : Vs = 200 V, Load circuit parameter 1 &ohm;, 2mH, 5V.Commutation circuit parameter : L = 25 H, C = 50 F. For constant load current at 100 A, the effective ON period and peak current through the main thyristor are respectively
In type A chopper source voltage is 100 V, d.c. ON period = 100 s, OFF-period = 150 s and load RLE consists of R = 2&ohm; , L = 5 mH, E = 10 V. For continuous conduction average output voltage and average output current for this chopper are respectively

Discussion

No Comment Found

Related MCQs

Reply to Comment