WorksheetsBEEE quiz mock test
Total questions: 45
Worksheet time: 23mins
In purely resistive circuit, energy delivered by source is ____________ by resistance.
dissipated in the form of heat
stored as electric field
stored as magnetic field
returned to source
Constant voltage source is
active and bilateral
passive and bilateral
active and unilateral
passive and unilateral
If the resistances 1Ω, 2Ω, 3Ω, 4Ω are parallel, then the equivalent resistance is?
0.46Ω
0.48Ω
0.5Ω
0.52Ω
Kirchhoff’s voltage law is based on principle of conservation of
energy
momentum
mass
charge
In non-linear network does not satisfy
Superposition condition
Homogeneity condition
Both homogeneity and superposition condition
Homogeneity, superposition and associative condition
A closed path made by several branches of the network is known as
Branch
Loop
Circuit
Junction
A junction where two (or) more than two network elements meet is known as a
Node
Branch
Loop
Mesh
The symbol used for representing Independent sources
Diamond
Square
Circle
Triangle
The opposing capacity of materials against the current flow is
Conductance
Inductance
Susceptance
Resistance
The current passing through a circuit is 7.2A and the power at the terminals is 27 watts.
resistance is ___________ ohms.
0.5402
0.5208
0.5972
0.5792
The energy per unit charge is
Voltage
Power
Current
Work
If energy w = 200t2+ 99 et + 2 then calculate at 0.1 sec
148.52
149.41
149.95
148.39
Relation between power, voltage and conductance
V = P2.G
V = P2/G
P = v2/G
P = V2 G
What is the other name for Dependent sources?
Uncontrolled sources
Time response elements
Steady state elements
Controlled sources
If the brushes of a DC generator are moved in order to bring these brushes in magnetic neutral axis, there will be
Demagnetization only
Cross magnetization as well as magnetization
Cross magnetization as well as demagnetization
Cross magnetization only
Equalizers are required in case the Armature is ________
Wave wound
Lap wound
Delta wound
Duplex wound
In over compounded generator, full load terminal voltage is _____
Almost zero
Less than no load terminal voltage
Greater than no load
terminal voltage
Equal to no load terminal voltage
Copper brushes in DC machines are used_________
Where low voltage and high current are involved
Where low current and high voltage are involved
In both of the above cases
None of the above cases
No-load speed of
which of the following motor is highest?
Differentially compound motor
Cumulative compound
motor
Series Motor
Shunt Motor
Which of the following load normally need starting torque more than the rated torque?
Conveyors
Blowers
Centrifugal pump
Air compressor
Which of the following rule is used to determine the direction of rotation of D.C motor?
Coloumb’s Law
Lenz’s Law
Fleming’s Right-hand Rule
Fleming’s Left-hand Rule
The material for commutator Brushes is generally
Mica
Cast Iron
Copper
Carbon
The secondary winding of which of the following transformers is always kept closed?
Current transformer
Voltage transformer
Power transformer
Step down transformer
If the supply frequency of a transformer increases, the secondary output voltage of the transformer
Increase
Decrease
Remain the same
Any of the above
The leakage flux in a transformer depends upon the value of
Frequency
Mutual Flux
Load current
Applied Voltage
Lamination of the transformer core is made of
Cast Iron
Silicon Steel
Aluminum
Cast Steel
Which of the following losses varies with the load in the transformer?
Core loss
Copper loss
Both core & copper loss
None of the above
For a PN junction diode, the current in reverse bias may be
Few milliamperes
Between 0.2 A and 15 A
Few amperes
Few micro or nano amperes
An example of Acceptor impurity is
Phosphorous
Arscenic
Antimony
Boron
The Knee voltage of Ge and Si is given as ____________ respectively
0.4 and 0.3
0.3 and 0.7
0.7 and 0.3
0.7 and 0.4
In a PN junction with no external voltage, the electric field between acceptor and donor ion is called a
Peak
Barrier
Threshold
Path
If valance band and Conduction bands are separated by a very large energy level then the material is
Insulator
Conductor
Semiconductor
Perfect Conductor
____________ semiconductor used most commonly because ____________
Ge , Low cost
Ge , Stability
Si , heat stability
Si , Low cost
For a N type Semiconductor the free electrons are present on _____________
Just below the conduction band
Just above the valance band
At the center of Forbidden energy level
None of the above
Zener Diode works on ____________ Bias condition.
Forward
Reverse
Zero
Unbias
During reverse bias, a small current develops known as ______________
Forward current
Reverse current
Reverse saturation current
Active current
PN junction failure below 5 V is caused primarily by
Avalanche breakdown
Zener breakdown
Either (a) or (b)
None of the above
How many junction/s do a diode consist?
1
2
3
0
If the voltage of the potential barrier is V0. A voltage V is applied to the input, at what moment will the barrier disappear?
V< V0
V= V0
V> V0
V<< V0
In a PN junction the potential barrier is due to the charges on either side of the junction, these charges are
Majority carriers
Minority carriers
Both (a) and (b)
Fixed donor and acceptor ions
The capacitance of a reverse biased PN junction
Increases as reverse bias is increased
Decreases as reverse bias is increased
Increases as reverse bias is decreased
Is insignificantly low
When PN junction is in forward bias, by increasing the battery voltage
Circuit resistance increases
Current through P-N junction increases
Current through P-N junction decreases
None of the above happens
When a PN junction is reverse-biased
Holes and electrons tend to concentrate towards the junction
The barrier tends to break down
Holes and electrons tend to move away from the junction
None of the above
In a PN junction when the applied voltage overcomes the ........ potential, the diode current is large, which is known as .............
Depletion, negative bias
Reverse, reverse bias
Resistance, reverse bias
Barrier, forward bias
In a reverse biased PN junction, the current through the junction increases abruptly at
0.5 V
1.1 V
0.72 V
Breakdown voltage
