New PDF release: Multiple Choice Questions in Electronics and Electrical

By T J DAVIES

A different compendium of over 2000 a number of selection questions for college students of electronics and electric engineering. This e-book is designed for the subsequent urban and Guilds classes: 2010, 2240, 2320, 2360. it might even be used as a source for perform questions for any vocational course.

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36 In the d i a g r a m the t i m e constant is • Û 4ms • ft 4 0 m s • c 400 ms • d 4 0 \LS 200 μΥ 200R T h e d i a g r a m s h o w s a c h a r g e d capacitor d i s c o n n e c t e d from a 125-V supply and short-circuited t h r o u g h the 2 0 0 - Ω resistor. T h e current at t = 4 0 m s is approximately • • • a -230 mA b -400 mA c -470 mA • d -560 mA - 1 · — 125 V 200 μ? 29 V • ft - 4 . 5 mA • ft - 3 . 5 V d 45 V • ft 2 2 . 51 Capacitors and inductors in DC circuits T h e d i a g r a m s h o w s a circuit w h i c h h a s b e e n c o n n e c t e d to a 4 5 - V D C supply until a steady state h a s b e e n reached.

T h e supply is d i s c o n n e c t e d and a short circuit is p l a c e d across the n e t w o r k as s h o w n . 56 T h e d i a g r a m s h o w s a circuit w h i c h has been c o n n e c t e d to a 2 0 0 - V supply until a steady state has b e e n r e a c h e d . T h e supply is d i s c o n n e c t e d and a short circuit is placed across the n e t w o r k as s h o w n . 65 suddenly c o n n e c t e d to a 2 5 - V supply. 66 The diagram shows a circuit which is s u d d e n l y c o n n e c t e d to a 100-V supply.

44 V • ft - 6 . 26 a 25 m s • b 250 ms • c 25 μ δ • d 250 \LS 0,025 μΥ IkO Ι—II—CZJ-N 30 T h e d i a g r a m s h o w s a c h a r g e d capacitor d i s c o n n e c t e d from a 125-V supply a n d short-circuited t h r o u g h the l - k f t resistor. T h e current at t = 0 s is • a -50 mA • • b -75 mA c -100 mA • d -125 mA V 0 . e. 36 In the d i a g r a m the t i m e constant is • Û 4ms • ft 4 0 m s • c 400 ms • d 4 0 \LS 200 μΥ 200R T h e d i a g r a m s h o w s a c h a r g e d capacitor d i s c o n n e c t e d from a 125-V supply and short-circuited t h r o u g h the 2 0 0 - Ω resistor.

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