The applied sine voltage to SCR is Vm = 200 V and R = 10Ω.If gate trigger lags the ac supply by 120o, then average load current is

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

A SCR has an anode supply of sine voltage 200 V rms., 50 Hz applied through a 100Ω resistor and fired at an angle of 60o. Assuming no voltage drop, the rms value of the output voltage is

1.  89.7 V

2.  126.7 V

3.  166.7 V

4.  

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4
Correct Answer :

126.7 V


Explanation :
No Explanation available for this question

In the circuit shown in the figure, the maximum current in the main SCR can be (given I0 = 70.7)

1.  200 A

2.  170.7 A

3.  141.4 A

4.  70.7 A

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4
Correct Answer :

170.7 A


Explanation :
No Explanation available for this question

The circuit in the figure shows zener regulated dc power supply. The zener diode is ideal. The minimum value of RL down to which the output voltage remain constant, is

1.  27 Ω

2.  45 Ω

3.  15 Ω

4.  24 Ω

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4
Correct Answer :

45 Ω


Explanation :
No Explanation available for this question

A single-phase AC regulator with an inductance load has following details : Source voltage, 230 V, at a frequency of 50 Hz and ωL = 5 ohms. The control range of the firing angle is

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

A single phase ac regulator fed from 50 Hz system supplies a load having resistance and inductance of 4.0 ohms and 12.73 mH respectively. The control range of firing angle is

1.  00 < α < 1800

2.  450 < α < 1800

3.  900 < α < 1800

4.  00 < α < 450

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4
Correct Answer :

450 < α < 1800


Explanation :
No Explanation available for this question

It is required to drive a dc shunt motor at different speeds in both the directions (forward and reverse) and also to brake it in both the directions. Which one of the following would you use

1.  A half-controlled thyristor bridge

2.  A full-controlled thyristor bridge

3.  A dual converter

4.   A diode bridge

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4
Correct Answer :

A dual converter


Explanation :
No Explanation available for this question

The frequency of ripple in the output voltage of a three-phase half controlled rectifier depends on

1.  firing angle

2.  lead inductance

3.  load resistance

4.   supply frequency

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4
Correct Answer :

supply frequency


Explanation :
No Explanation available for this question

In the given circuit, if the resistance R is varied from 0 to ω, then

1.  phase remains constant.

2.  phase varies from 0 to ± 900

3.  magnitude is constant and phase varies from 0 to 1800

4.  phase of the circuit is given by 2 tan-1

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4
Correct Answer :

phase of the circuit is given by 2 tan-1


Explanation :
No Explanation available for this question

A dc source of 100 V supplies a purely inductive load 0.1 H. The controller is a thyristor in series with the source and load. The latching current specified is 100 mA. The minimum width of the gating pulse to ensure thyristor turn ON is

1.  100 S

2.  100s

3.  1 ms

4.  50 S

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4
Correct Answer :

100 S


Explanation :
No Explanation available for this question
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