০২। A battery is a device composed of one or more:
ক) chemical cells
খ) voltage generators
গ) solar cells
ঘ) piezoeletric cells
ঙ) None of the above
০৩। A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?
ক) 0.1 A
খ) 1000 A
গ) 10 A
ঘ) 100 A
ঙ) None of the above
০৪। A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?
ক) 4.73
খ) 0.4 V
গ) 24 V
ঘ) 600 V
ঙ) None of the above
০৫। A circuit has a Norton current of 10 mA and a Norton resistance of 10 kW. What is the Thevenin circuit?
ক) 1000 V and a series resistance of 10 k Ohm
খ) 100 V and a parallel resistance of 10 k Ohm
গ) 100 V and a series resistance of 10 k Ohm
ঘ) 1000 V and a parallel resistance of 10 kOhm
ঙ) None of the above
০৬। A circuit has two different voltage sources that are connected in a series-aiding form. If the sources are rated at 6 V and 9 V, what is the total source voltage?
ক) 15 V
খ) 16 V
গ) 7.5 V
ঘ) 8 V
ঙ) None of the above
০৭। A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage?
ক) 3 V
খ) 16 V
গ) 7.5 V
ঘ) 8 V
ঙ) None of the above
০৮। A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?
ক) 2 k Ohm
খ) 10 k Ohm
গ) 20 k Ohm
ঘ) 1 k Ohm
ঙ) None of the above
০৯। A device that converts chemical energy to electrical energy is called a:
ক) solar cell
খ) thermocouple
গ) chemical cell
ঘ) electric device
ঙ) None of the above
১০। A device that converts light energy to electrical energy is called a:
ক) thermocouple
খ) solar cell
গ) photodiode
ঘ) photo transistor
ঙ) None of the above
১১। A device that converts mechanical into electrical energy is?
ক) solar cell
খ) thermocouple
গ) chemical cell
ঘ) generator
ঙ) None of the above
১২। A device that converts mechanical pressure to electrical energy is called a:
ক) piezoelectric device
খ) solar cell
গ) photodiode
ঘ) nicad cell
ঙ) None of the above
১৩। A device that converts thermal energy to electrical energy is called a:
ক) thermocouple
খ) solar cell
গ) chemical cell
ঘ) piezoelectric devices
ঙ) None of the above
১৪। A dielectric material is:
ক) a good conductor
খ) a good insulator
গ) a poor conductor of electrostatic fields
ঘ) a good conductor of magnetic fields
ঙ) None of the above
১৫। A diode is in series with 220W. If the voltage across the resister is 4V, what is the current through the diode?
ক) 55 A
খ) 55.86 A
গ) 18.2 mA
ঘ) 16.3 mA
ঙ) None of the above
১৬। A farad is defined as the amount of capacitance necessary for:
ক) dissipating 1 W of power
খ) causing an ac phase shift greater than 90 degree
গ) storing 1 V for 1 second
ঘ) changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
ঙ) None of the above
১৭। A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?
ক) 60 Ohm
খ) 50 Ohm
গ) 100 Ohm or more
ঘ) 10 Ohm
ঙ) None of the above
১৮। A high-pass filter:
ক) passes lower-frequency signals and reduces higher-frequency signals
খ) passes higher-frequency signals and reduces lower-frequency signals
গ) has no effect on ac signals
ঘ) increases the level of all frequencies by a significant amount