77902. The minimum gate current which can turn on SCR is called :
77903. The total number of leads in SUS, SBS and SCS respectively are
77904. Which of these devices can conduct in both directions?
77905. Assertion (A): A half wave controlled rectifier has poorer efficiency and higher ripple factor than a full wave controlled rectifier.Reason (R): The use of a freewheeling diode in half wave controlled rectifier circuit improves the waveform of load current and circuit power factor.
77906. A 3 phase dual converter consists of
77907. Which inverter circuit uses coupled inductors?
77908. When an SCR is in forward blocking mode, the applied voltage
77909. In sinusoidal PWM for inverters the width of different pulses are not the same.
77910. A class D chopper
77911. Relay is protection device used in:
77912. The efficiency of a chopper circuit is about
77913. If the frequency is less than the damped frequency in a series- inverter
77914. The output frequency of a cycloconverter can be changed by changing the firing angle.
77915. Mc Murray full bridge inverter uses
77916. Assertion (A): A DIAC has four layers but only two terminals. Reason (R): A DIAC can conduct in both directions.
77917. In a 3 phase full converter, the instantaneous output voltage can have negative part if
77918. In a single phase full wave ac regulator using two thyristors only, the gate circuits of the two thyristors
77919. The circuit in figure is for
77920. A fully controlled bridge converter is feeding an RLE load. For some circuit conditions firing angle is 47°. If connections of battery are reversed, the firing angle is likely to be
77921. In a single phase half wave converter feeding resistive load and full wave converter (M - 2 connection) feeding a resistive load the circuit conditions are similar. The firing angle is a . Then the waveshapes of voltages across thyristors
77922. In a 3 phase full converter feeding a highly inductive load, the average load current is 150 A. The peak current through thyristor is
77923. The main utility of SCR is due to
77924. In a single phase full wave ac regulator the firing angles during both half cycles are equal.
77925. In a 3 phase full wave regulator feeding a star connected resistance load, firing angle is 75°. Then the number of thyristors conducting at one time is
77926. Weak insulation can be checked by:
77927. The turn on characteristics of a power transistor can be assumed to be linear, as shown in the below figure . During turn on time T, voltage reduces linearly from V to 0 and current rises linearly from 0 to I. The energy loss during time T is
77928. In window type air-conditioners the following expansion device used:
77929. A single phase half bridge inverter required to feed R-L loads needs
77930. Typical values of for an SCR are in the range of
77931. When a dc chopper feeds an RLE load, the load current, during steady state operation
77932. In a single phase full wave ac regulator feeding R-L load, the gate pulses
77933. In a semi converter feeding a resistive load,
77934. In a single phase semi-converter the number of thyristors is
77935. A dc chopper is feeding an RLE load. The current can become discontinuous if
77936. Which of these commutation methods uses two leads?
77937. A single phase half wave rectifier is feeding a resistive load. As firing angle is increased
77938. A cycloconverter for single phase operation has
77939. A chopper is a high efficiency circuit.
77940. The difference between resonant commutation and self commutation is
77941. Freon 12 ideal pressure is:
77942. A NAND gate has 3 inputs and one output. The number of thyristors required for this gate are
77943. Which of these devices is used in relaxation oscillator?
77944. In a single phase semiconverter feeding a highly inductive load, the load current is
77945. Two thyristors of the same rating and specifications
77946. 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
77947. In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is
77948. In a cycloconverter it is possible to vary
77949. A single phase full bridge inverter for R-L loads needs
77950. In the basic series inverter circuit, the source current has
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