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Quiz 4
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Q.1
Alternating current is measured by
induction ammeter
permanent magnet type ammeter
electrostatic ammeter
moving iron repulsion type voltmeter
Q.2
A universal RLC bridge uses
Maxwell bridge configuration for measurement of inductance and De Santas bridge for measurement of capacitance
Maxwell Wein bridge for measurement of inductance and modified De Santy’s bridge for measurement of capacitance
Maxwell Wein bridge for measurement of inductance and Wein bridge for measurement of capacitance
Any of the above
Q.3
In a D.C. machine, the value of peripheral speed should not, normally, exceed
10 m/s
20 m/s
30 m/s
40 m/s
Q.4
In a D.C. machine the current per brush arm should not be more than
100 A
200 A
300 A
400 A
Q.5
Direct water cooling of rotor winding presents
No mechanical difficulties
Lesser mechanical difficulties
Greater mechanical difficulties
None of the above
Q.6
Aluminium when adopted as a conductor material in ______ transformers, decreases the overall cost of the transformer
small size
medium size
large size
any of the above size
Q.7
For measuring a very high resistance we should use
Kelvin’s double bridge
Wheat stone bridge
Meggar
None of the above
Q.8
Commonly used instruments in power system measurement are
induction
moving coil or iron
rectifier
electrostatic
Q.9
In self cooled motors the cooling time constant is about ______ than the heating time constant because cooling conditions are worse at standstill.
2 to 3 times greater
3 to 4 times greater
4 to 5 times greater
none of the above
Q.10
________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable.
Cast steel
Aluminium
Soft steel
Cast iron
Q.11
A power factor meter has
one current circuit and two pressure circuits
one current circuit and one pressure circuit
two current circuits and one pres¬sure circuit
none of the above
Q.12
Is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another,
Tangent galvanometer
Meggar
Current transformer
None of the above
Q.13
A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.
ammeter
voltmeter
flux-meter
ballistic galvanometer
Q.14
Damping of the Ballistic galvanometer is made small to
get first deflection large
make the system oscillatory
make the system critically damped
get minimum overshoot
Q.15
Materials exhibiting zero value of resistivity are known as ______ .
conductors
semiconductors
insulators
superconductors
Q.16
The power factor of a single phase load can be calculated if the instruments available are
one voltmeter and one ammeter
one voltmeter, one ammeter and one wattmeter
one voltmeter, one ammeter and one energy meter
any of the above
Q.17
The adjustment of position of shading bands, in an energy meter is done to provide
friction compensation
creep compensation
braking torque
none of the above
Q.18
According to application, instruments are classified as
switch board
portable
both (A) and (B)
moving coil
moving iron
Q.19
Commonly used standard capacitor is
spherical type
concentric cylindrical type
electrostatic type
multilayer parallel plate type
Q.20
Is universally used for windings of electrical machines because it is easily workable without any possibility of
fracture
Silver
Steel
Aluminium
Copper
Q.21
The power of a n-phase circuit can be measured by using a minimum of
(n – 1) wattmeter elements
n wattmeter elements
(n + 1) wattmeter elements
2n wattmeter elements
Q.22
________ is the common method of applying brushes to the commntator.
Radial
Trailing
Reaction
All of the above
Q.23
are always double layer type.
Closed windings
Open windings
Either of the above
None of the above
Q.24
Volt box is a component to
extend voltage range
measure voltage
compare voltage in a box
none of the above
Q.25
For measuring current at high frequency we should use
moving iron instrument
electrostatic instrument
thermocouple instrument
none of the above
Q.26
The high voltage winding is usually which of the following type ?
Cylindrical winding with circular conductors
Cross-over winding with either circular or small rectangular conductors
Continuous disc type winding with rectangular conductors
All of the above types
Q.27
The change in flux linkages can be caused in which of the following ways ?
The flux is constant with respect to time and is stationary and the coil moves through it
The coil is stationary with respect to flux and the flux varies in magnitude with respect to time
Both the changes mentioned above occur together, i.e., the coil moves through a time vary-ing field
All of the above
Q.28
Disc windings are primarily used in
short capacity transformers
medium capacity transformers
high capacity transformers
any of the above
Q.29
Resistances can be measured with the help of
wattmeters
voltmeters
ammeters
ohmmeters and resistance bridges
all of the above
Q.30
A multirangq instrument has
multiple shunt or series resistances inside the meter
multicoii arrangement
variable turns of coil
multi range meters inside the measurement system
any of the above
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