In a single phase full wave ac regulator feeding R-L load, the gate pulses
In a semi converter feeding a resistive load,
In a single phase semi-converter the number of thyristors is
A dc chopper is feeding an RLE load. The current can become discontinuous if
Which of these commutation methods uses two leads?
A single phase half wave rectifier is feeding a resistive load. As firing angle is increased
A cycloconverter for single phase operation has
A chopper is a high efficiency circuit.
The difference between resonant commutation and self commutation is
If 0.5 T is the time period of oscillations and Toff is the time between turn off of one thyristor and turn on of second thyristor, the frequency of output f of a series inverter is
In a series inverter
A NAND gate has 3 inputs and one output. The number of thyristors required for this gate are
Which of these devices is used in relaxation oscillator?
In auxiliary commutated chopper fed by voltage V and having L and C commutating elements, the peak value of capacitor current is
In a single phase semiconverter feeding a highly inductive load, the load current is
Two thyristors of the same rating and specifications
A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque
In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is
A single phase half wave converter is feeding-a resistor load. The input voltage is v = Vm sin ωt. If firing angle is zero, the output dc voltage Vdc and output rms voltage Vrms respectively
In a cycloconverter it is possible to vary
A single phase full bridge inverter for R-L loads needs
In the basic series inverter circuit, the source current has
Thyristors connected in series need static and dynamic stabilizing circuits.
In a controlled rectifier a freewheeling diode is necessary if the load is
For an illumination control circuit it is advisable to use a matched TRIAC-DIAC pair.