1.(TCO 3) A transformer has turns ratio of 5:2. The primary current is 3 A when the secondary voltage is 20 V AC. What is the minimum VA rating for this transformer to work correctly? (Points : 7)
24 VA
60 VA
150 VA
3 VA
Question 2.2.(TCO 3) For the bridge rectifier circuit below, calculate the VP(sec) if R = 1.5 kW and Vpri(rms)= 110 VAC and the transformer turns ratio is 3:1.
(Points : 7)
120 V
32 V
51.85 V
50 V
Question 3.3.(TCO 3) A diode carries 20 mA with a 2.0 V forward voltage drop. What is the power dissipation? (Points : 7)
4 W
40 mW
2 W
2 mW
Question 4.4.(TCO 3) The circuit below is a
(Points : 7)
half wave rectifier.
full wave rectifier with center tap transformer.
bridge rectifier.
None of the above
Question 5.5.(TCO 3) The small AC variations found at the output of a bridge rectifier are called _____ voltage. (Points : 7)
alternate
ripple
regulator
direct
Question 6.6.(TCO 3) A resistive load of 2 kW is connected across the secondary windings of a 25:1 transformer. If the primary voltage is 50 V AC, what will be the secondary current? (Points : 7)
25 mA
2 mA
625 mA
1 mA
Question 7.7.(TCO 3) The output of a certain rectifier circuit looks like the wave form below. This rectifier is a
(Points : 7)
half wave rectifier.
full wave rectifier.
bridge rectifier.
None of the above
Question 8.8.(TCO 3) For the single stage amplifier circuit below, calculate DC VCE.
(Points : 7)
15 V
10.94 V
3.75 V
7.89 V
Question 9.9.(TCO 3) Download the Multisim file and simulate the circuit. VC measures _____. (Choose closest value.)
Multisim File
(Points : 7)
7.5 V
5.5 V
3.46 V
8.54 V
Question 10.10.(TCO 3) Download the Multisim file and simulate the circuit. VE measures _____. (Choose closest value.)
Multisim File
(Points : 7)
6.5 V
2.3 V
10 V
12 V
Question 11.11.(TCO 3) A 3 V trigger voltage is applied to the gate of a SCR through a 560 ohm gate resistor. What is the trigger current? (Points : 7)
1 mA
4.1 mA
5.6 mA
10 mA
Question 12.12.(TCO 3) What is the collector to emitter voltage if a BJT has a supply voltage of 10 V, a collector current of 1 mA, and emitter resistors of 1 k ohms each? (Points : 7)
10 V
8 V
2 V
1 V
Question 13.13.(TCO 3) For a common source FET amplifier, gm= 1,600 ms and RD= 3.5 k. The voltage gain (AV) is _____. (Points : 7)
8.5
6
5.6
None of the above
Question 14.14.(TCO 3) For the amplifier circuit below, calculate the output voltage (VOUT(PK)). Hint: Note the bypass capacitor across RE.
(Points : 7)
1.38 V
18.5 V
200 mV
5.5 V
Question 15.15.(TCO 3) Determine the voltage gain (AV) of this transistor amplifier.
(Points : 7)
100
1.5
50
6.7
Question 16.16.(TCO 3) Use Multisim to simulate the circuit below. VB measures _____. (Choose closest value.)
Multisim File
(Points : 7)
5 V
3 V
8.5 V
10 V
Question 17.17.(TCO 3) At what point on the frequency response curve is the bandwidth measured? (Points : 7)
At 3 dB above midband
At 3 dB below midband
At midband
At 0 Hz
Question 18.18.(TCO 3) What is the CMRR of an inverting op amp amplifier with a feedback resistance of 200 k ohms and an input resistance of 20 k ohms and a common mode gain of 0.001? (Points : 7)
20
200
10,000
20,000
Question 19.19.(TCO 3) A signal connected to which of the following op amp inputs will experience a 180 degree phase shift at the output? (Points : 7)
Inverting
Noninverting
Differential
Offset
Question 20.20.(TCO 3) Which is a typical value for an op amp’s open loop voltage gain? (Points : 7)
1
10
100
100,000
Question 21.21.(TCO 3) Once the upper critical frequency is reached, increases in frequency result in _____ in gain. (Points : 7)
decreases
increases
no change
unknown changes
Question 22.22.(TCO 3) A positive or negative voltage that appears at the output of an op amp when no signal is applied to the input is called _____ voltage. (Points : 7)
output offset
bias
CMRR
slew
Question 23.23.(TCO 3) The following amplifier can be used as a(n) _____.
(Points : 7)
integrator
differentiator
summing
comparator
Question 24.24.(TCO 3) A summing amplifier can have _____. (Points : 7)
only one input
only two inputs
any number of inputs
a number of inputs equal to a multiple of 2
Question 25.25.(TCO 3) Identify amp.
(Points : 7)
Integrator
Noninverting
Summing
Inverting
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