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Q.1
Write the unit of magnetic flux?
wbm2\frac{wb}{m^2}m2wb
wb
AT
AT/m
Q.2
Write the unit of magnetic field intensity?
wbm2\frac{wb}{m^2}m2wb
wb
AT
AT/m
Q.3
Write the unit of magnetic flux density?
wbm2\frac{wb}{m^2}m2wb
wb
AT
AT/m
Q.4
A moving-coil permanent-magnet instrument can be used as flux meter
by using a low resistance shunt
by using a high series resistance
by eliminating the control springs
by making control springs of large moment of inertia
Q.5
To measure radio frequency, the suitable frequency meter is
Weston frequency meter
reed vibrator frequency meter
heterodoxy frequency meter
electrical resonance frequency meter
Q.6
In a Schering bridge the potential of the detector above earth potential is
a few volts only
1 kV
5 kV
10 kV
Q.7
________ 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.8
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.9
E.m.f. of a Weston cell is accurately measured by
electrostatic voltmeter
hot wire voltmeter
isothermal voltmeter
electrodynamic voltmeter
Q.10
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.11
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.12
In a Weston synchronoscope, the fixed coils are connected across
bus-bars
incoming alternator
a lamp
none of the above
Q.13
An ohmmeter is a
moving iron instrument
moving coil instrument
dynamometer instrument
none of the above
Q.14
An ammeter is a
secondary instrument
absolute instrument
recording instrument
integrating instrument
Q.15
Most common form of A.C. meters met with in every day domestic and industrial installations are
mercury motor meters
commutator motor meters
induction type single phase energy meters
all of the above
Q.16
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.17
A voltage of aboutV can be measured
directly by a potentiometer
a potentiometer in conjunction with a volt ratio box
a potentiometer in conjunction with a known resistance
none of the above
Q.18
It is required to measure the true open circuit e.m.f. of a battery. The best device is
voltmeter
Ammeter and a known resistance
'potentiometer
None of the above
Q.19
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.20
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be
almost zero
low
high
none of the above
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