A sinusoidal voltage applied to the input of a CRO with the timebase turned off will result in?

1. A sinusoidal voltage applied to the input of a CRO with the timebase turned off will result in

 

(a) a vertical line on the screen

(b) no screen display at all

(c) a sinusoidal display

(d) the display of the positive half-cycle of the input waveform

2. If two complete cycles of the alternating signal applied to the X input of a CRO are to be displayed, the frequency of the time base signal applied to the Y input must be

(a) the same as the X input frequency (b) twice the X input frequency

(c) any value at all

(d) half the X input frequency

3. A sinusoidal alternating-voltage wave is applied to a CRO and the peakto- peak measurement of the trace is 4.2 cm. If the Y amplifier setting is 100 V/cm, the RMS value of the displayed voltage is

(a) 420 V (b) 296 V (c) 210 V (d) 148 V

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Sketch the load characteristics, terminal voltage/load current, of the following types of DC generator

1. (a) Sketch the load characteristics, terminal voltage/load current, of the following types of DC generator: (i) series-connected, (ii) shunt-connected and (iii) compound-connected.   (b) State one purpose for which….

what happens if the resistance in series with the shunt field of a DC motor is increased in value

1. Sparking at the trailing edges of the brushes in a DC machine is usually prevented by fitting   (a) copper gauze brushes (b) a compensating winding (c) a compound….

Calculate the synchronous speed of a 10-pole three-phase machine connected to a 50 Hz supply.

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