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Worksheets102906/CO922S - MANUFACTURING PRACTICES (EC) – A EVALUATION
Total questions: 30
Worksheet time: 30mins
Which of the following resistors is most accurate and stable with temperature changes?
Carbon composition resistor
Metal film resistor
Wire wound resistor
Carbon film resistor
Which type of capacitor can be connected in either direction in a circuit?
Tantalum electrolytic capacitor
Aluminum electrolytic capacitor
Ceramic disc capacitor
Polarized electrolytic capacitor
The temperature coefficient of resistance is measured in:
Ohms per degree Celsius
Siemens per degree Celsius
ppm/°C (parts per million per °C)
Microfarads per °C
In a Zener diode, reverse current begins to flow significantly when:
Forward voltage exceeds 0.7 V
Reverse voltage exceeds the breakdown voltage
Current is zero
The diode is in forward bias
The power rating of a resistor indicates
The maximum current that can flow through it
The maximum voltage it can handle
The maximum power it can safely dissipate without damage
The tolerance value of the resistor
In a voltage divider circuit, Vin=12V , R1=2kΩ and R2=4kΩ. What is the output voltage Vout across R2?
8 V
6 V
4 V
2 V
Two resistors of 100 Ω and 200 Ω are connected in parallel. The equivalent resistance is approximately:
66.7 Ω
100 Ω
150 Ω
300 Ω
The purpose of a voltage divider circuit is to:
Increase current in a circuit
Convert DC to AC voltage
Produce an output voltage that is a fraction of the input voltage
Maintain constant power across resistors
In a mixed series-parallel circuit, two 100 Ω resistors are connected in parallel and that combination is in series with a 50 Ω resistor. The total resistance is:
150 Ω
100 Ω
75 Ω
125 Ω
A capacitor which has a positive and a negative lead is
Ceramic disc type capacitor
Electrolytic capacitor
Plastic capacitor
Electrostatic capacitor
The total resistance of a series circuit can be less than the largest resistor in that circuit.
True
False
Capacitance increases with
larger plate area and greater distance between the plates.
smaller plate area and greater distance between the plates.
larger plate area and less distance between the plates.
higher values of applied voltage.
In the figure, what is the multimeter set to measure?
AC Voltage
AC Current
DC Voltage
DC Current
In a 5-band coding scheme, what is the colour code for a 4.7k resistor with 5% tolerance?
Yellow, Violet, Black, Black, Silver
Yellow, Violet, Black, Brown, Gold
Yellow, Violet, Black, Brown, Silver
None of the above
The component used in a dc power supply for obtaining a constant dc value at its output is
pnp transistor
npn transistor
Capacitor
Zener diode
A ceramic capacitor has 104K printed on it. What is its capacitance value?
10*10^4 pF
104 μF
104 pF
None of the above
The time period of a square wave with frequency 10kHz is
100 ms
10 ms
100 μs
None of the above
_____ is an electronic component that stores energy in the form of magnetic field.
Diode
Capacitor
Inductor
Transistor
When testing a transistor with a multimeter, a good NPN transistor will show:
Low resistance from collector to emitter in both directions
Low resistance between base and emitter (forward bias) and high resistance (reverse bias)
Equal resistance in all junctions
Open circuit in both directions for all terminals
How many 120Ω resistors must be connected in parallel to obtain an equivalent resistance, Req, of 15 Ω?
15
8
12
6
In series connection of resistors, what happens to the current across each resistor?
Increases
Decreases
Remains the same
Initially increases and then decreases.
A reverse-biased diode acts like a(n)
Closed Switch
Open Switch
Resistor
None of the above
The basic reason why a full wave rectifier has a twice the efficiency of a half wave rectifier is that
It makes use of transformer
Its ripple factor is much less
It utilizes both half-cycle of the input
Its output frequency is double the line frequency
When the collector junction in a transistor is biased in reverse direction and the emitter junction in the forward direction, the transistor is said to be is the
Active Region
Cut-off Region
Saturation Region
None of the above
BC547 is a
Transistor
Resistor
Diode
Inductor
The primary function of a Digital Storage Oscilloscope (DSO) is to
Measure current and resistance directly
Display the variation of voltage with respect to time
Generate periodic signals
Act as a DC power supply
The current passing through a resistor in a circuit is 1 A when the voltage across the same resistor is 10 V. What is the value of current when the voltage across the resistor is 8 V?
0.8 A
8 A
18 A
80 A
The V-I plot for Ohmic devices is:
Bi-Linear
Linear
Parabolic
Exponential
Which of the following waveforms can be generated using a Function Generator?
Only sine waves
Only square and triangle waves
Sine, square, and triangular waves
Only triangular and sawtooth waves
In an experiment, a signal of 200 mV peak and 5 kHz frequency was displayed on the DSO. If the time/div setting is 0.1 ms/div, approximately how many complete cycles will appear on the screen (10 divisions)?
1 cycle
2 cycles
5 cycles
10 cycles
