1.
A transduction principle used primarily in optical sensors.
2.
Which of the following does not cause permanent damage to an SCR?
3.
Which device does not have a gate terminal?
4.
Freewheeling diode at the output of a rectifier allows
5.
It is preferable to use a train of pulse of high frequency for gate triggering of SCR in order to reduce
6.
The peak reverse blocking voltage of an IGBT is nearly
7.
Which one of the following is NOT the advantage of solid state switching of ac capacitors into ac supply over relay-based switching?
8.
What is an automatic speed control device using the centrifugal force on rotating flyweights as the feedback element?
10.
The use of multiphase rectifier in place of one phase rectifier results in
11.
Current in SCR to turn on transient can be reduced by
13.
The p-type emitter of a UJT is ______doped.
14.
The specified maximum junction temperature of thyristors is about
15.
Turned-on of a thyristor takes place when
16.
ECG stands for electrocardiography while EEG stands for?
17.
Which one of the following statements is correct? In the case of load regulation
18.
Which device exhibits negative resistance region?
19.
Turn-off time of a thyristor
20.
In order to get best results per unit cost, the heat sinks, on which the thyristors are mounted , are made of
21.
The device commonly used for triggering a triac is
22.
An SCR is a _____ triggered device.
23.
The most suitable device for high frequency inversions in SMPS is
24.
The ON voltage and forward breakover of an SCR depend on the
25.
A freewheeling diode in a phase-controlled rectifier
26.
A diac has how many semiconductor layers?
27.
Which of the following configurations is used for both motoring and regenerative braking?
28.
An SCR is a solid state equivalent of which tube?
29.
When the supply voltage exceeds the breakover voltage of an SCR, it
30.
An SCR remains turned on if the anode current is more than
31.
The latching current is _________ than the holding current
32.
The di/dt protection for an SCR is achieved through the use of
33.
The minimum gate current which can turn on SCR is called:
34.
Which of the following is NOT a method primarily used for density sensing?
35.
Which one of the following is used as the main switching element in a switched mode power supply operating in 20 kHz to 100 kHz range?
36.
AC voltage regulators are widely used in
37.
The input power factor of the converter is
38.
An SCR chopper circuit supplies power to a dc motor , what will be the nature of motor armature current?
39.
Which is suitable for making the variable frequency drives
40.
When an SCR is combined to a switch, it is considered as a switch.
41.
When the temperature increases, the intrinsic stand off ratio
42.
The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of in the quotation.
43.
When the SCR is OFF, the current in the circuit is
44.
The basic difference between a series regulator and a shunt regulator is
45.
With gate open, if the supply voltage exceeds the breakover voltage of SCR, then SCR will conduct
48.
The advantage of using a freewheeling diode with bridge type ac/dc converterr is
49.
In a chopper fed dc drive , the chopping frequency is approximately equal to
50.
What is a three terminal device used to control large current to a load?
