Question 1
WHAT UNIT WILL THE TOTAL ENERGY STORED IN A CAPACITOR BE MEASURED IN ? FARADS
JOULES COULOMBS VOLTS Question 2
FOR MAXIMUM CAPACITANCE THE PLATES OF A CAPACITOR MUST BE AS BIG AS POSSIBLE
AS SMALL AS POSSIBLE AS CLOSE AS POSSIBLE AS FAR APART AS POSSIBLE Question 3
INDUCTANCE IS MEASURED IN WHAT UNITS ? AMPS PER SECOND
VOLTS PER METRE COULOMBS
HENRIES Question 4
IF A POLARISED (ELECTROLYTIC) CAPACITOR WAS CONNECTED THE WRONG WAY ROUND TO A SUPPLY, WHAT WOULD HAPPEN ?
IT WOULD ONLY CHARGE UP DURING THE POSITIVE HALF CYCLE IT WOULD ONLY CHARGE UP DURING THE NEGATIVE HALF CYCLE IT WOULD NOT CHARGE UP AT ALL
IT WOULD BE DESTROYED Question 5
CALCULATE THE ENERGY STORED IN A 200 MICRO FARAD CAPACITOR CONNECTED TO A 200 VOLT SUPPLY 0.02 JOULES 8 JOULES 4 JOULES 40 JOULES Question 6
IF 3 10 MICRO FARAD CAPACITORS ARE CONNECTED IN SERIES, THE CHARGE ON EACH CAPACITOR WILL BE THE SAME 3 TIMES AS GREAT ONE THIRD THREE TENTHS Question 8
WHAT IS THE FORMULA NEEDED TO CALCULATE THE ENERGY STORED IN AN INDUCTOR? E = 0.5CU2 E = 0.5LI2 E = 1/2 BLv E = BLv Question 9
On an AC Mains supply of 230volts, what is the minimum voltage value which capacitors must be rated at?
250 VOLTS 400 VOLTS 600 VOLTS 220 VOLTS
Question 10
TO CALCULATE CAPACITANCE, WHICH OF THE FOLLOWING FORMULAS IS TRUE V = Q/C
V = C/Q Q = V/C Q = C/V Question 11
IF A CURRENT OF 12.5A FLOWS FOR A TIME OF 2 MINUTES CALCULATE THE AMOUNT OF CHARGE TRANSFERRED 150 VOLTS 1500 FARADS 1500 COULOMBS 9.6 COULOMBS Question 12
IF A CHARGE OF 500 MICRO COULOMBS IS STORED IN A 25 MICRO FARAD CAPACITOR, WHAT WILL THE P.D. ACROSS THE PLATES BE?
0.2 volts 20 volts
12500 milli volts 1250 milli volts Question 13
CALCULATE THE CHARGE IF A 200 MICRO FARAD CAPACITOR IS CONECTED TO A 200 VOLTS SUPPLY 0.04 COULOMBS 0.4 COULOMBS 0.04 JOULES 0.4 JOULES Question 14
CALCULATE THE EQUIVALENT CAPACITANCE OF 3 CAPACITORS WHEN CONNECTED IN SERIES.
THERE VALUES ARE :
5 MICRO FARAD, 10 MICRO FARAD AND 30 MICRO FARAD 2 MICRO FARAD
0.02 MICRO FARAD 0.33 MICRO FARAD 3 MICRO FARAD Question 15
THE ELECTRIC FIELD STRENGTH OF A CAPACITOR IS DETERMINED BY THE VOLTAGE BETWEEN THE PLATES DIVIDED BY THE THICKNESS OF THE DIALECTRIC.
BUT WHAT UNITS ARE ELECTRIC FIELD STRENGTH MEASURED IN ? COULOMBS PER SQUARE METRE
AMPS PER SECOND VOLTS PER METRE WATTS PER SECOND Question 16
WHICH IS CORRECT FORMULA FOR CALCULATING THE ENERGY STORED IN A CAPACITOR
E = 0.5CU2 E = 0.5LI2 C = W/0.5U U = W/0.5C
Question 17
AS A GENERAL RULE, WHEN A CAPACITOR IS FULLY CHARGED WHAT WILL IT BLOCK? A D.C. VOLTAGE
AN A.C. VOLTAGE A D.C. CURRENT AN A.C. CURRENT Question 18
THE CAPACITOR FITTED IN THE STARTER SWITCH OF A FLUORESCENT LIGHT FITTING IS FOR WHAT REASON ?
TO MAKE IT START QUICKER
TO STOP IT FLICKERING WHEN IT'S STARTING TO IMPROVE THE POWER FACTOR
TO SUPPRESS RADIO FREQUENCY INTERFERENCE Question 19
FIXED CAPACITORS CAN BE PLACED INTO THREE GENERAL CLASSES RELATED TO THEIR DIALECTRICS
WHICH CLASS WOULD AN ELECTROLYTIC CAPACITOR BE IN ? LOW LOSS CAPACITOR
MEDIUM LOSS CAPACITOR POLARISED CAPACITOR HIGH STABILITY CAPACITOR Question 20
If the Peak Voltage is 1 Volt AC what is the RMS value 0.637 V
1.414V 0.707V 1.618V
ANSWERS!!!!!!!!!!!!!!!
Question 1
WHAT UNIT WILL THE TOTAL ENERGY STORED IN A CAPACITOR BE MEASURED IN ? Correct Answer: JOULES
Question 2
FOR MAXIMUM CAPACITANCE THE PLATES OF A CAPACITOR MUST BE Correct Answer: AS CLOSE AS POSSIBLE
Question 3
INDUCTANCE IS MEASURED IN WHAT UNITS ? Correct Answer: HENRIES
Question 4
IF A POLARISED (ELECTROLYTIC) CAPACITOR WAS CONNECTED THE WRONG WAY ROUND TO A SUPPLY, WHAT WOULD HAPPEN ?
Correct Answer: IT WOULD BE DESTROYED REMEMBER
POLARISED CAPS SHOULD NOT BE CONNECTED TO AN ALTERNATING VOLTAGE AND MUST BE CORRCTLY CONNECTED TO A DC SUPPLY.
Question 5
CALCULATE THE ENERGY STORED IN A 200 MICRO FARAD CAPACITOR CONNECTED TO A 200 VOLT SUPPLY
Correct Answer: 4 JOULES REMEMBER
E = 0.5CU2
Question 6
IF 3 10 MICRO FARAD CAPACITORS ARE CONNECTED IN SERIES, THE CHARGE ON EACH CAPACITOR WILL BE
Correct Answer: THE SAME Question 7
WHY ARE DISCHARGE RESISTORS OFTEN CONNECTED TO LARGE CAPACITORS Correct Answer: TO SAFELY DISSIPATE THE CHARGE HELD THUS REDUCING SHOCK RISK
Question 8
WHAT IS THE FORMULA NEEDED TO CALCULATE THE ENERGY STORED IN AN INDUCTOR?
Correct Answer: E = 0.5LI2
Question 9
On an AC Mains supply of 230volts, what is the minimum voltage value which capacitors must be rated at?
Question 10
TO CALCULATE CAPACITANCE, WHICH OF THE FOLLOWING FORMULAS IS TRUE Correct Answer: V = Q/C
Question 11
IF A CURRENT OF 12.5A FLOWS FOR A TIME OF 2 MINUTES CALCULATE THE AMOUNT OF CHARGE TRANSFERRED
Correct Answer: 1500 COULOMBS REMEMBER THE CHARGE IS Q AND
Q = I x t
Question 12
IF A CHARGE OF 500 MICRO COULOMBS IS STORED IN A 25 MICRO FARAD CAPACITOR, WHAT WILL THE P.D. ACROSS THE PLATES BE?
Correct Answer: 20 volts Question 13
CALCULATE THE CHARGE IF A 200 MICRO FARAD CAPACITOR IS CONECTED TO A 200 VOLTS SUPPLY
Correct Answer: 0.04 COULOMBS Question 14
CALCULATE THE EQUIVALENT CAPACITANCE OF 3 CAPACITORS WHEN CONNECTED IN SERIES.
THERE VALUES ARE :
5 MICRO FARAD, 10 MICRO FARAD AND 30 MICRO FARAD Correct Answer: 3 MICRO FARAD
Question 15
THE ELECTRIC FIELD STRENGTH OF A CAPACITOR IS DETERMINED BY THE VOLTAGE BETWEEN THE PLATES DIVIDED BY THE THICKNESS OF THE DIALECTRIC.
BUT WHAT UNITS ARE ELECTRIC FIELD STRENGTH MEASURED IN ? Correct Answer: VOLTS PER METRE
REMEMBER E = U/d
Question 16
WHICH IS CORRECT FORMULA FOR CALCULATING THE ENERGY STORED IN A CAPACITOR
Correct Answer: E = 0.5CU2
Question 17
AS A GENERAL RULE, WHEN A CAPACITOR IS FULLY CHARGED WHAT WILL IT BLOCK? Correct Answer: A D.C. CURRENT
Question 18
THE CAPACITOR FITTED IN THE STARTER SWITCH OF A FLUORESCENT LIGHT FITTING IS FOR WHAT REASON ?
Correct Answer: TO SUPPRESS RADIO FREQUENCY INTERFERENCE
Question 19
FIXED CAPACITORS CAN BE PLACED INTO THREE GENERAL CLASSES RELATED TO THEIR DIALECTRICS
WHICH CLASS WOULD AN ELECTROLYTIC CAPACITOR BE IN ? Correct Answer: POLARISED CAPACITOR
Question 20
If the Peak Voltage is 1 Volt AC what is the RMS value Correct Answer: 0.707V
