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Quiz 6
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Q.1
The disc of an instrument using eddy current damping should be of
conducting and magnetic material
non-conducting and magnetic material
conducting and non-magnetic material
none of the above
Q.2
For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?
1.0 Wb/m²
1.1 Wb/m²
1.3 Wb/m²
1.6 Wb/m²
None of the above
Q.3
Hot rolled sheets have ______ value of permeability
zero
low
high
none of the above
Q.4
An ammeter is a
secondary instrument
absolute instrument
recording instrument
integrating instrument
Q.5
________ cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall
Direct
Indirect
Conventional
Any of the above
Q.6
The switch board instruments
should be mounted in vertical position
should be mounted in horizontal position
either (A) or (B)
neither (A) nor (B)
Q.7
An ohmmeter is a
moving iron instrument
moving coil instrument
dynamometer instrument
none of the above
Q.8
Hydrogen has a heat transfer co-efficient _____ times that of air
1.5
2.5
3.5
4.5
Q.9
The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following?
Corrugations
Fins
Tubes
All of the above
Q.10
The distance between the starts of two consecutive coils measured in terms of coil sides is called
front pitch
winding pitch
commutator pitch
back pitch
Q.11
In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was
unity
0.8 lagging
0.8 leading
zero
Q.12
The thermal conductivity of hydrogen is ______ times that of air
2
3
5
7
Q.13
The design of mechanical parts is particularly important in case of _____ speed machines.
low
medium
high
any of the above
Q.14
A voltage of about 200 V can be measured
directly by a D.C. potentiometer
a D.C. potentiometer in conjunction with a volt ratio box
a D.C. potentiometer in conjunction with a known resistance
none of the above
Q.15
A current density of _________ is used for large power transformers with forced circulation of oil or with water cooling coils
1.5 to 2.5 A/mm²
3.5 to 4.5 A/mm²
4.0 to 5.0 A/mm²
5.4 to 6.2 A/mm²
Q.16
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be
almost zero
low
high
none of the above
Q.17
E.m.f. of a Weston cell is accurately measured by
electrostatic voltmeter
hot wire voltmeter
isothermal voltmeter
electrodynamic voltmeter
Q.18
Which of the following is measured by using a vector voltmeter ?
Amplifier gain and phase shift
Filler transfer functions
Complex insersion loss
All of the above
Q.19
_______ brushes are fragile and cause excessive wear of commutator,
Natural graphite
Hard carbon
Electro graphitic
Metal graphite
Q.20
To avoid the effect of stray magnetic field in A.C. bridges we can use
magnetic screening
Wagner earthing device
wave filters
any of the above
Q.21
It is required to measure the true open circuit e.m.f. of a battery. The best device is
D.C. voltmeter
Ammeter and a known resistance
D.'potentiometer
None of the above
Q.22
In D.C. machines the width of the duct is usually
4 mm
6 mm
8 mm
10 mm
Q.23
The efficiency of a machine should be as ______ as possible to reduce the operating cost.
high
low
either of the above
none of the above
Q.24
Which of the following methods is used for air cooling of turbo-alternators ?
One sided axial ventilation
Two sided axial ventilation
Multiple inlet system
All of the above
Q.25
In a Weston frequency meter, the magnetic axes of the two fixed coils are
parallel
perpendicular
Q.26
A practical formula for determining the thickness of insulation between low voltage and high voltage windings is
1 + 0.2 kV mm
2 + 0.5 kV mm
4 + 0.7 kV mm
5 + 0.9 kV mm
Q.27
In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be
unity
0.5
0.3
zero
Q.28
Wattmeter cannot be designed on the principle of
electrostatic instrument
thermocouple instrument
moving iron instrument
electrodynamic instrument
Q.29
To measure a resistance with the help of a potentiometer it is
necessary to standardise the potentiometer
not necessary to standardise the potentiometer
necessary to use a volt ratio box in conjunction with the potentiometer
none of the above
Q.30
A Weston synchronoscope is a
moving coil instrument
moving iron instrument
dynamometer instrument
none of the above
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