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WorksheetsSILICON CONTROLLED RECTIFIERS
Total questions: 21
Worksheet time: 19mins
Choose power switches used in controlled rectifier circuits.
BJTs
Diodes
IGBTs
Thyristors
During the positive half-cycle of the supply voltage, the power switches of controlled rectifiers are automatically turn-on.
True
False
Choose the requirements to turn-on the thyristors in a controlled full-wave rectifiers.
The anode terminal of the thyristors is positive.
The cathode terminal of the thyristor is positive.
The half-cycle of the AC supply voltage is positive.
Applying a control signal to the gate terminal of the thyristors.
The function of controlled rectifiers is to vary the DC power supplied to the load.
True
False
Under typical operation, the current conduction range of controlled rectifiers is larger than uncontrolled rectifiers.
True
False
SCR is defined as ...............
Silicone Cup Rectifier
Supply Controlled Rectifier
Silicone Controlled Rectifier
Shorted Controlled Rectifier
Which is the symbol of SCR?
Terminals of SCR are ..........
Anode and Cathode
Collector, Base and Emitter
Anode, Cathode and Gate
Drain, Source and Gate
Power Electronics can be defined as ...........
A conversion from Alternating Current to Direct Current of Power Supply
A conversion of DC power supply to AC power supply
A conversion of AC power supply to AC power supply
A technology of converting electric power from one supply to another supply using electronic power devices.
The electronic devices below are unidirectional devices EXCEPT:
TRIAC
Diode
Silicone Controlled Rectifier
Diode pass ......... in one direction?
a) Voltage
b) Current
c) Both
d) None of these
A silicon controlled rectifier (SCR) is a_______
Unijunction device
Device with three junction
Device with four junction
None of the above
A thyristor is basically_____
PNPN device
A set of SCRs
A combination of diac and triac
A set of SCR, diac and a triac
If holding current of a thyristor is 2 mA then latching current should be____
0.02
0.001
0.004
0.002
SMPS is used for
obtaining controlled ac power supply
switch from one source to another
storage of dc power
obtaining controlled dc power supply
To switch on SCR need ......
Positive Vgt
Negative Vgt
Base current
Collector current
Which of the following statement is correct for an SCR operating in REVERSE BLOCKING MODE - practical condition
Three types of common power transistor are.....
Fill in the blank . Power Electronics circuits involve______________ from one form to another using power semiconductor devices
