1.
The main advantage of IGBT over SCR in power electronics is
2.
An SCR is made of silicon and not germanium because silicon.
3.
Two thyristor of same rating and same specifications
4.
When an SCR is combined to a switch, it is considered as a switch.
6.
The dv/dt effect in SCR can result in
7.
Thyristor is a semiconductor switch which is
8.
To turn off the SCR, which of the following is done?
9.
Which of the following is the normal way to turn on an SCR?
10.
The triac is fundamentally a/an_____with a gate terminal for controlling the turn-on conditions of the bilateral device in either direction.
11.
The specified maximum junction temperature of thyristors is about
12.
Which of the following is NOT a method primarily used for density sensing?
13.
A transduction principle used primarily in optical sensors.
14.
In the SCR structure the gate terminal is located
15.
The latching current is _________ than the holding current
16.
Static voltage equalization in series connected SCRs is obtained by the use of
17.
What Greek word which means “switch”?
18.
A modern power semiconductor device that combines the characteristics of BJT and MOSFET is
19.
Freewheeling diode at the output of a rectifier allows
20.
The peak reverse blocking voltage of an IGBT is nearly
21.
Which terminal does not belong to the SCR?
22.
A freewheeling diode in a phase-controlled rectifier
23.
Current in SCR to turn on transient can be reduced by
24.
Which one of the following controls reduces the size of the transformer in a switch mode ac power supply ?
25.
Which transistor conducts current in both directions when turned on?
26.
As compared to power MOSFET, a BJT has
27.
The di/dt protection for an SCR is achieved through the use of
28.
Once an SCR is turned on, it remains so until the anode current goes below
29.
The torque produced by a single-phase induction motor fed through an ac voltage controller for speed control is due to
30.
Which of the following devices should be used as a switch in a low power switched mode power supply (SMPS) ?
31.
Which of the following can change the angle of conduction in SCR?
32.
ECG stands for electrocardiography while EEG stands for?
34.
An SCR is a solid state equivalent of which tube?
35.
The voltage across an SCR when it is turned on is about
36.
Which one of the following is NOT the advantage of solid state switching of ac capacitors into ac supply over relay-based switching?
37.
What are some areas where GTO is applicable?
38.
The terminals of a power MOSFET are called
39.
A thyristors are not made using germanium, because
40.
For a BJT α = 0.98, then β =
41.
An SCR is considered to be a semicontrolled device because
42.
Switching regulators are also called
43.
An advantage of cycloconverter is
44.
di/dt protection is provided to the thyristor by
45.
What is the sensing element of acceleration transducer?
46.
The snubber circuit is used in thyristor circuits for
47.
A resistor connected across the gate and cathode of an SCR
48.
The SCR can exercise control over of ac supply.
49.
The p-type emitter of a UJT is ______doped.
50.
Most SCRs can be turned-off by voltage reversal during negative half cycle of the ac supply for
