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Quiz 3
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Q.1
Instrument transformers are
potential transformers
current transformers
both (A) and (B)
power transformers
Q.2
In order to achieve high accuracy, the slide wire of a potentiometer should be
as long as possible
as short as possible
neither too small not too large
very thick
Q.3
Which of the following materials is used in the manufacture of resistance grids to be used in the starters of largemotors ?
Copper
Aluminium
Steel
Cast-iron
Q.4
Two holes in the disc of energy meter are drilled at the opposite sides of the spindle to
improve its ventilation
eliminate creeping at no load
increase its deflecting torque
increase its braking torque
Q.5
Various adjustments in an energy meter include
light load or friction
lag and creep
overload and voltage compensation
temperature compensation
all of the above
Q.6
When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of
short pitch
full pitch
either of the above
none of the above
Q.7
Which of the following methods may be adopted to reduce the effects of armature reaction?
Increase in length of air gap at pole tips
Increasing reluctance of pole tips
Compensating windings
All of the above
Q.8
In D.C. machines the number of slots per pole usually lies
between 2 to 4
between 6 to 8
between 9 to 16
between 20 to 30
Q.9
Standard resistor is made from
platinum
maganin
silver
nichrome
Q.10
A dynamometer wattmeter can be used for
both D.C. and A.C.
D.C. only
A.C. only
any of the above
Q.11
Systematic errors are
instrumental errors
environmental errors
observational errors
all of the above
Q.12
Helical windings are used in
distribution transformers
power transformers
shell type transformers
none of the above
Q.13
Murray loop test can be used for location of
ground fault on a cable
short circuit fault on a cable
both the ground fault and the short-circuit fault
none of the above
Q.14
Tractive magnets are operated from
a.c. supply
d.c. supply
either a.c. or d.c. supply
none of the above
Q.15
The scale of a rectifier instrument is
linear
non-linear
either (A) or (B)
neither (A) nor (B)
Q.16
A direct current can be measured by
a D.C. potentiometer directly
a D.C. potentiometer in conjunction with a standard resistance
a D.C. potentiometer in conjunction with a volt ratio box
none of the above
Q.17
Transformers with a capacity of up to _____ have a cooling radiator system with natural cooling
2 MVA
5 MVA
7.5 MVA
10 MVA
Q.18
The laminations of the armature of a D.C. machine are usually _____ thick.
0.1 to 0.2 mm
0.2 to 0.3 mm
0.3 to 0.4 mm
0.4 to 0.5 mm
Q.19
For measurement of inductance having high value, we should use
Maxwell’s bridge
Maxwell Wein bridge
Hay’s bridge
Any of the above
Q.20
If an instrument has cramped scale for larger values, then it follows
square law
logarithmic law
uniform law
none of the above
Q.21
The resistivity of water should not be less than
10 Q m
100 Q m
1000 Q m
2000 Q m
Q.22
Which of the following in an application of D.C. motors?
Traction
Drives for process industry
Battery driven vehicles
Automatic control
All of the above
Q.23
Most sensitive galvanometer is
elastic galvanometer
vibration galvanometer
Duddlb galvanometer
spot ballistic galvanometer
Q.24
The gravity controlled instrument has crowded scale because current is proportional to
balancing weight
deflection angle
sine of deflection angle
All of the above
Q.25
Which of the following is an essential part of a motor meter ?
An operating torque system
A braking device
Revolution registering device
All of the above
Q.26
Power transformers have rating
equal to 50 kVA
equal to 100 kVA
above 200 kVA
none of the above
Q.27
Which of the following is the basic consideration in the design of insulation ?
Electrical considerations
Mechanical considerations
Thermal considerations
All of the above
Q.28
In a single phase power factor meter the phase difference between the currents in the two pressure coils is
exactly 0°
approximately 0°
exactly 90°
approximately 90°
Q.29
Which of the following methods is most accurate ?
Equivalent current method
Equivalent power method
Equivalent torque method
Method of average losses
Q.30
D.C. servomotors are used in
Purely D.C. control systems
Purely AC. control systems
Both D.C. and AC. control systems
None of the above
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