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WorksheetsELECS 22
Total questions: 50
Worksheet time: 25mins
What is the maximum number of electrons in a subshell?
2
6
10
14
The repeatability of a servo-controlled robot is within _____ mm rather than a fraction of a mm.
2
4
3
5
What is the principal quantum number of a Q shell?
6
5
4
7
What time when the voltage across L will be equal to the voltage across R in a series RL transient circuit where E = 24 V, R = 10 Ω and L = 1 H?
69.3 ms
69.3 s
6.93 ms
6.93 s
What is the hysteresis loss at a frequency of 60 cycles per second of an audio transformer magnetic core which has a maximum flux density of 10,000 gausses? The volume of solid iron of this core is 66.8 cubic cm and the hysteresis coefficient (a constant that depends upon grade and quality of iron) id 5.35 x 10-4.
0.5386 W
53.86 W
5.386 W
5386 W
When two coils of equal inductances are connected in series with coefficient of coupling and their fields in phase, find the total inductance of two coils.
2LA
2LA (1+k)
2kLA
LA (2 + k)
A 2 μF capacitor with initial charge q0 = 100 μC, is connected across a 100 Ω resistor at t = 0. Calculate the time in which the transient voltage across the resistor drops from 40 to 10 V.
2.77 s
0.277 ms
2.77 ms
0.277 s
What do you call a small D.C generator built into alternators to provide excitation current to field windings?
prime mover
excitor
commutator
load
What is the condition of the diode in a parallel-limiter when the output is developed?
Shunted
Conducting
Cut-off
Shorted
What is the payload of the industrial robot AEA IRb-60?
60 kg
80 kg
50 kg
70 kg
Which of the following robot is primarily used for machining processes?
Cincinatti T1
Cincinatti T3
Cincinatti T2
Cincinatti T4
The Kuka spot welding robot has how many degrees of freedom?
4
6
5
7
What system in industrial electronics has the ability to monitor certain variable in the industrial processes, the same can perform self-correcting action?
Coal-slurry system
Closed-loop system
Open-loop system
Feed forward control system
What is the property of a gyro so that the axis of rotation or spin axis tends to remain in a fixed direction in space if no force is applied to it?
Selectivity
Precession
Rigidity
Sensitivity
In a series RLC circuit with R= 200Ω L= 0.1 H and C= 5µF, find the transient current after the switch is closed at t=0 applying a 200V source.
2e^(-1000t)sin 1000t
2e^(-1000t)cos 1000t
2e^(-100t)sin 100t
2e^(-100t)cos 100t
A 0.09 µF capacitor is charged to 220V. How long in milliseconds will it discharge to a level of 110V if the discharge resistor has a resistance of 20kΩ?
1.25
12.5
125
0.125
What are the heavy particles that include the proton and the neutron?
Mesons
Baryons
Leptons
Quarks
What particles have rest masses ranging down to about 0.1amu?
Leptons
Baryons
Quarks
Mesons
By definition, what is the individual angular momentum of the neutron proton and electron?
h/4π
h/2π
h/π
4πh
In the hysteresis loop, what do you call the product of the residual magnetic flux and coercive field strength?
Effectivity product
Hysteresis coefficient
Residual-coercive product
Steinmetz’s product
Programming of a continuous-path robot is normally carried out by a method called ______ through.
See
Walk
Pull
Push
What do you call the strong magnetism that occurs in certain ceramic compounds such as ferrites?
Ferromagnetism
Ferrimagnetism
Diamagnetism
Paramagnetism
What characteristic is determined by the time required for a voltage wave to travel from the input end of an electrical transmission line to the output end and back again?
Pulse position
Pulse line
Pulse width
Pulse code
A disturbance similar to brownout but of shorter duration that occurs when the line voltage drops below 80-85% of its rated voltage by one or more cycles.
Sag or dip
Chronic overvoltage
Spike
Transient
What term is given to the positions of the rotors of a synchro transmitter and the synchro receiver when both rotors are on a 0 degree displaced from 0 degree by the same angle?
Correspondence
Overlap
Fine tune
Stability
What ac voltage defect refers to a high voltage (up to 6000V or more) peak lasting approximately 100µs to one-half cycle?
Sag or dip
Spike
Chronic overvoltage
Transient
The largest computers commonly use a word size of ______ bits.
32
128
64
256
What do you call the ratio of the safe load to the nameplate load of an electrical motor?
Service factor
Load factor
Efficiency
Service life
Covalent bond energy in germanium is about ____ eV.
1.5
7.4
3.0
4.7
The service factors of motors vary from ____ to _____.
2.5 to 2.9
1.15 to 1.4
1.1 to 1.3
3.1 to 5.5
How many voltage are available from two-phase, three wire alternator?
One
Three
Two
Four
At what frequency does the RC circuit of an amplifier reduce the voltage gain to 70.7 percent of its midrange value?
Resonant
Cutoff
Critical
Natural
What is the operating temperature of class A motor under motor classification?
105°C
130°C
155°C
180°C
What particular motor class in which the operating temperature is 180°C?
Class H
Class F
Class A
Class B
What are the basic components of a harmonic drive used in robot transmission system?
Wave generator
Flexspline
Circular spline
All of the choices
What is the operating temperature of class B motor?
200°C
155°C
130°C
180°C
What is the width of the pulse radiated by a fire control tracking radar?
Very thick
Narrow
Thick
Very narrow
If the operating temperature is 155°C then it falls under what motor classification?
Class F
Class B
Class H
Class A
How much percent is stray losses in dc machines?
1%
2%
5%
10%
What are considered standard minimum distance between components on a chip?
4 and 5 µm
5 and 10 µm
2 and 3 µm
1 and 2µm
For an advanced chip, the minimum distance between components is
1 µm
2 µm
3 µm
4 µm
What are used to apply or remove power and to select a function or a circuit within a device?
Switch
Relay
Circuit control devices
Breaker
What do you call a register on the CPU used for the temporary storage of data during arithmetic or logic operations?
Flip-flop
Accumulator
Memory
RAM
What parameter specifies the value of voltage from cathode to cathode at which the SCR breaks into the avalanches region and begins to conduct heavily as in the pn junction diode?
Forward-breakover voltage
Reverse-breakover voltage
Break-over voltage
Stop-over voltage
What type of servo system based on the same principle of error-signal generation where velocity is sensed, and the load is moving at the desired velocity?
Velocity servo
Rate servo
Speed servo
Controlled servo
What is the term for the switch that disconnects the circuit completely at one position before the connection of the next position made?
Break-before-make
Make-before-break
Break-before-break
Make-before-make
What is the identifying feature of a colpitts oscillator?
Split inductor
Split resistor
Split transformer
Split capacitor
What instrument is used to measure the amount of active ingredients in the electrolyte of a battery?
Hygrometer
Voltmeter
Electrometer
Hydrometer
What is the typical frequency range about the center frequency of a tunable magnetron?
± 5%
± 2%
± 4%
± 6%
What is a gaseous tube that uses a poll of liquid mercury at its cathode?
Thyratron
Phanotron
Klystron
Ignitron
