ATT
PRACTICE EXAM QUESTIONS WITH
CORRECT DETAILED ANSWERS |
ALREADY GRADED A+<RECENT
vERSION>
1) Electrical Shock - ANSWER Sensation and muscular spasm cause when electric
current passes through the body
2) Voltage - ANSWER Potential of electric energy; pressure of electrons pushing
away from each other
3) Current - ANSWER Flow of electrons
4) Most dangerous paths - ANSWER Hand to hand & left hand to either foot
5) Factors affecting shock - ANSWER Amount of current, path of current, amount of
body resistance, length of time current flows in body
6) 3 ways to prevent shock - ANSWER Isolate, insulate & ground
7) Grounding conductor - ANSWER Used to form a low resistance path from the
ground to the metallic tool case
8) 12MA - ANSWER Minimum AC current required to cause severe muscle
contractions
,9) The body - ANSWER Acts like a conductor when it becomes part of a circuit
10) 5xs - ANSWER How much more DC is required to freeze the body rather than
AC
11) Burns - ANSWER Electrical burns, arc burns, thermal contact burns
12) Electrical burns - ANSWER Electrical current flowing through tissue or bones
13) Arc burns - ANSWER High temperatures near the body produced by electric arc
or explosion
14) Thermal contact burns - ANSWER When skin comes in contact with hot surfaces
of overheated electrical conductors
15) Limiting action happens in series when a diode is________ and in parallel when a
diode is________. - ANSWER Reverse biased, forward biased.
16) What is the purpose of a diode limiting circuit? - ANSWER To limit amplitude of
the input.
17) What do clampers do? - ANSWER Add DC to AC signal.
18) A transistor in a Common Emitter transfers an internal resistance from a low
resistance in emitter base to? - ANSWER High resistance in collector base.
19) Ie (Emitter current) = ? - ANSWER Ib (base current) + Ic (collector current)
20) When does cutoff occur in a Common Emitter? - ANSWER When Emitter PN
junction is reversed.
21) A Common Emitter has a gain of how much? - ANSWER 10
,22) How does a Common Emitter affect the phase of an input signal? - ANSWER It
inverts the input 180° (flip)
23) A Common Collector has a gain of how much? - ANSWER 1 (no phase inversion)
24) A Common Base has a gain of how much? - ANSWER 10 (no phase inversion)
25) How do transistor amplifiers operate? - ANSWER By an AC input signal changing
base bias.
26) The component that develops bias for a transistor part is directly connected to
the_________. - ANSWER Corresponding transistor part.
27) In a Common Emitter, if base voltage (base bias) increases, emitter current does
what? - ANSWER Increases.
28) A small input controls a__________. - ANSWER Large output
29) What is the most common type of Multi-stage Amplifier? - ANSWER RC
(Resistive-capacitive)
30) What is the purpose of Cascade amplifiers? - ANSWER To increase Av (Voltage
Gain)
31) How is AvT (Total voltage gain) calculated in a Cascade Amplifier? - ANSWER
The product of individual stage gains (Q1xQ2xQ3x...=AvT)
32) What is the typical gain for a three stage cascade amplifier (assumed value)? -
ANSWER 1,000
33) What is Cascading? - ANSWER The connecting of multiple amplifiers in series.
, 34) What is step 1 of the Multi-Stage Amplifier Troubleshooting process? - ANSWER
Check output, compare measured Av to Calculated Av.
35) What is step 2 of the Multi-Stage Amplifier Troubleshooting process? - ANSWER
Check individual stage gains.
36) What is step 3 of the Multi-Stage Amplifier Troubleshooting process? - ANSWER
Check components of isolated stage, start with transistor.
37) What is step 4 of the Multi-Stage Amplifier Troubleshooting process? - ANSWER
If the transistor is not at fault, turn off power and take resistance measurements.
Replace Faulty component.
38) Is a value of 1100 acceptable in a three stage Cascade Amplifier (assumed value)? -
ANSWER Yes. There is an assumed error margin of ±10%. 1100 falls within the
assumed value of 1,000's margin.
39) What is the purpose of a Push-Pull Amplifier? - ANSWER To amplify power.
PPP: push-pull power.
40) What are the properties of a Push-Pull Amplifier? - ANSWER High efficiency,
high current gain, low output resistance, low distortion.
41) Income received in advance (deferred income) does what to the profit for the year? -
ANSWER decreases it
42) A prepayment will do what to the profit for the year? - ANSWER increases it
43) Development expenditure will always be capitalised in the accounts - ANSWER
false
44) Research expenditure will never be capitalise in the accounts - ANSWER true
PRACTICE EXAM QUESTIONS WITH
CORRECT DETAILED ANSWERS |
ALREADY GRADED A+<RECENT
vERSION>
1) Electrical Shock - ANSWER Sensation and muscular spasm cause when electric
current passes through the body
2) Voltage - ANSWER Potential of electric energy; pressure of electrons pushing
away from each other
3) Current - ANSWER Flow of electrons
4) Most dangerous paths - ANSWER Hand to hand & left hand to either foot
5) Factors affecting shock - ANSWER Amount of current, path of current, amount of
body resistance, length of time current flows in body
6) 3 ways to prevent shock - ANSWER Isolate, insulate & ground
7) Grounding conductor - ANSWER Used to form a low resistance path from the
ground to the metallic tool case
8) 12MA - ANSWER Minimum AC current required to cause severe muscle
contractions
,9) The body - ANSWER Acts like a conductor when it becomes part of a circuit
10) 5xs - ANSWER How much more DC is required to freeze the body rather than
AC
11) Burns - ANSWER Electrical burns, arc burns, thermal contact burns
12) Electrical burns - ANSWER Electrical current flowing through tissue or bones
13) Arc burns - ANSWER High temperatures near the body produced by electric arc
or explosion
14) Thermal contact burns - ANSWER When skin comes in contact with hot surfaces
of overheated electrical conductors
15) Limiting action happens in series when a diode is________ and in parallel when a
diode is________. - ANSWER Reverse biased, forward biased.
16) What is the purpose of a diode limiting circuit? - ANSWER To limit amplitude of
the input.
17) What do clampers do? - ANSWER Add DC to AC signal.
18) A transistor in a Common Emitter transfers an internal resistance from a low
resistance in emitter base to? - ANSWER High resistance in collector base.
19) Ie (Emitter current) = ? - ANSWER Ib (base current) + Ic (collector current)
20) When does cutoff occur in a Common Emitter? - ANSWER When Emitter PN
junction is reversed.
21) A Common Emitter has a gain of how much? - ANSWER 10
,22) How does a Common Emitter affect the phase of an input signal? - ANSWER It
inverts the input 180° (flip)
23) A Common Collector has a gain of how much? - ANSWER 1 (no phase inversion)
24) A Common Base has a gain of how much? - ANSWER 10 (no phase inversion)
25) How do transistor amplifiers operate? - ANSWER By an AC input signal changing
base bias.
26) The component that develops bias for a transistor part is directly connected to
the_________. - ANSWER Corresponding transistor part.
27) In a Common Emitter, if base voltage (base bias) increases, emitter current does
what? - ANSWER Increases.
28) A small input controls a__________. - ANSWER Large output
29) What is the most common type of Multi-stage Amplifier? - ANSWER RC
(Resistive-capacitive)
30) What is the purpose of Cascade amplifiers? - ANSWER To increase Av (Voltage
Gain)
31) How is AvT (Total voltage gain) calculated in a Cascade Amplifier? - ANSWER
The product of individual stage gains (Q1xQ2xQ3x...=AvT)
32) What is the typical gain for a three stage cascade amplifier (assumed value)? -
ANSWER 1,000
33) What is Cascading? - ANSWER The connecting of multiple amplifiers in series.
, 34) What is step 1 of the Multi-Stage Amplifier Troubleshooting process? - ANSWER
Check output, compare measured Av to Calculated Av.
35) What is step 2 of the Multi-Stage Amplifier Troubleshooting process? - ANSWER
Check individual stage gains.
36) What is step 3 of the Multi-Stage Amplifier Troubleshooting process? - ANSWER
Check components of isolated stage, start with transistor.
37) What is step 4 of the Multi-Stage Amplifier Troubleshooting process? - ANSWER
If the transistor is not at fault, turn off power and take resistance measurements.
Replace Faulty component.
38) Is a value of 1100 acceptable in a three stage Cascade Amplifier (assumed value)? -
ANSWER Yes. There is an assumed error margin of ±10%. 1100 falls within the
assumed value of 1,000's margin.
39) What is the purpose of a Push-Pull Amplifier? - ANSWER To amplify power.
PPP: push-pull power.
40) What are the properties of a Push-Pull Amplifier? - ANSWER High efficiency,
high current gain, low output resistance, low distortion.
41) Income received in advance (deferred income) does what to the profit for the year? -
ANSWER decreases it
42) A prepayment will do what to the profit for the year? - ANSWER increases it
43) Development expenditure will always be capitalised in the accounts - ANSWER
false
44) Research expenditure will never be capitalise in the accounts - ANSWER true
