Quiz

Answer the following questions . . . (this page works in IE6 and above)

1) A standard switching impulse is characterized by

	250/2500 µsec pulse
	1.2/50 µsec pulse
	8/20 µsec pulse
	none of the above

2) A standard lightning impulse is characterized by

	250/2500 µsec pulse
	1.2/50 µsec pulse
	8/20 µsec pulse
	none of the above

3) Time to front of an impulse voltage wave is defined as

	time interval between 0.1 to 0.9 of peak value.
	1.25 times the interval between 0.3 to 0.9 of peak value.
	1.67 times the interval between 0.1 to 0.9 of peak value.
	1.25 times the interval between 0.1 to 0.9 of peak value.

4) Can an inductor be used in place of capacitor for generating impulses?

	yes, because both are energy storage devices.
	no, there is more spillage of energy in inductor than in a capacitor.
	no, interrupting currents using dc switches are not advisable.
	yes, inductor can be charged easily with any current signal.
	1^st and 2^nd.
	2^nd and 3^rd.

5) Which relation holds good to generate impulse voltage (where R_f is the value of the front resistor in Ohms, C_g is the generator capacitance in microfarads, R_t is the value of the tail resistor in ohms, C_l is the Load capacitance in microfarads)?

	R_fC_g > R_tC_l.
	R_f/C_g > R_t/C_l.
	R_fC_g < R_tC_l.
	none of the above

6) Increasing values of Inductances in the Marx circuit

	produces a delayed response of the impulse signal.
	damps the Oscillations in the Output waveform.
	introduces oscillations in the output waveform.
	has no effect on the output waveform.
	1^st and 3^rd.

7) Balancing resistors in each stage of a Marx Circuit are provided to

	achieve a balance in the charging among the 2 capacitors of each stage.
	to allow “zero” current flow between the capacitors of the same stage.
	both 1^st and 2^nd.
	none of the above.

8) The charging resistance is chosen in such a way to

	minimize the losses in the circuit.
	to achieve fast rising pulses.
	to achieve controlled wave shape.
	none of the above.

9) What factors are to be taken into account while deciding the maximum number of stages in any impulse voltage generator

	the voltage level to which we desire to produce impulse wave.
	the voltage ratings of the capacitors used in the apparatus.
	1^st and 2^nd.
	none of the above.

10) An impulse waveform is represented by

	e^-at Cos bt.
	e^at Cos bt.
	e^-at - e^-bt.
	e^at - e^bt.