1.
The triac is fundamentally a/an_____with a gate terminal for controlling the turn-on conditions of the bilateral device in either direction.
3.
Which one of the following statements is correct? In the case of load regulation
4.
The terminals of a power MOSFET are called
5.
An SCR triggered by a current pulse through its gate can be turned off by
6.
In the forward blocking region of a silicon controlled rectifier, the SCR is
7.
Acceleration transducers are also called
8.
An SCR is a member of what family?
9.
Turned-off time of a thyristor
10.
The triac can be used only in
11.
In a UPS, the solid state switch normally transfer supply within
13.
It is preferable to use a train of pulse of high frequency for gate triggering of SCR in order to reduce
14.
AC power in a load can be controlled by connecting
15.
SCR is a rectifier constructed of silicon material. Silicon is chosen because
16.
A single-phase full converter gives maximum and minimum output voltage at firing angles of
17.
Which of the following is NOT a method primarily used for density sensing?
18.
The supply voltage is generally _____that of breakover voltage in an SCR.
19.
When the SCR is OFF, the current in the circuit is
20.
A thyristors are not made using germanium, because
21.
Natural commutation can be used in:
22.
An ideal regulated power supply should have
23.
A modern power semiconductor device that combines the characteristics of BJT and MOSFET is
24.
Turned-on of a thyristor takes place when
25.
A resistor connected across the gate and cathode of an SCR
26.
The voltage across an SCR when it is turned on is about
27.
How many semiconductor layers does a triac have?
28.
Carrier frequency gate drive is used for turn-on of a thyristor to reduce.
29.
What is the control element in an SCR?
30.
Dc to dc converter or chopper can
31.
Line regulation is determined by
32.
An SCR is considered to be a semicontrolled device because
33.
The value of anode current required to maintain the conduction of an SCR even though the gate signal is removed is called as the
34.
Which of the following devices does not belong to the transistor family?
35.
To turn on the UJT, the forward bias on emitter diode should be______ the peak point voltage.
36.
Which one of the following is the most suitable device for a dc to dc converter?
37.
Which one of the following controls reduces the size of the transformer in a switch mode ac power supply ?
38.
What is dimensionless parameter of the second-order characteristic equation?
39.
An SCR remains turned on if the anode current is more than
40.
What Greek word which means “switch”?
41.
What is an automatic speed control device using the centrifugal force on rotating flyweights as the feedback element?
42.
In a 3 phase fully controlled converter the firing frequency is
43.
Switching regulators are also called
44.
R-C snubber is used in parallel with the thyristor to
45.
What is the ratio of two exponential functions of time called?
46.
When cathode of a thyristor is made more positive than its anode
47.
The torque produced by a single-phase induction motor fed through an ac voltage controller for speed control is due to
48.
The typical turn-off time of an SCR is about
49.
When the emitter terminal of a UJT is open, the resistance between the base-terminals is generally
50.
Triacs can not be used in ac voltage regulator for a
