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Electrical Engineering
Electrical Machine Design
Quiz 5
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Q.1
Yokes with rectangular cross-section are used for
small capacity transformers
medium capacity transformers
large capacity transformers
any of the above
Q.2
The mcrease in heat dissipation by air blasts is due to increase in
conduction
convection
radiation
any ofthe above
Q.3
In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be
out of phase by 90°
out of phase by 60°
out of phase by 30°
out of phase by 0°
Q.4
In a D.C. machine the number of brush arms is _____ the number of poles.
less than
equal to
greater than
none of the above
Q.5
The operation of a D.C. machine with large air gap lengths is comparatively
quiet
noisy
either of the above
none of the above
Q.6
If an inductance is connected in one arm of bridge and resistances in the remaining three arms
the bridge can always be balanced
the bridge cannot be balanced
the bridge can be balanced if the resistances have some specific values
none of the above
Q.7
A sensitive galvanometer produces large deflection for a
small value of current
large value of current
large value of power
large value of voltage
none of the above
Q.8
Which of the following are integrating instruments ?
Ammeters
Voltmeters
Wattmeters
Ampere-hour and watt-hour meters
Q.9
The use of _____ instruments is merely confined within laboratories as standardizing instruments.
absolute
indicating
recording
integrating
none of the above
Q.10
Which of the following meters are not used on D.C. circuits
Mercury motor meters
Commutator motor meters
Induction meters
None of the above
Q.11
In a low power factor wattmeter the pressure coil is connected
to the supply side of the current coil
to the load side of the current coil
in any of the two meters at connection
none of the above
Q.12
are used for construction of core of electromagnets.
Soft magnetic materials
Hard magnetic materials
Either (A) or (B)
None of the above
Q.13
For measurements on high voltage capacitors, the suitable bridge is
Wein bridge
Schering bridge
Any of the above
None of the above
Q.14
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.15
In ______ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft.
small
medium
large
any of the above
Q.16
is usually used for brush rockers
Mild steel
Copper
Aluminium
Cast-iron
Q.17
In a Weston synchronoscope, the fixed coils are connected across
bus-bars
incoming alternator
a lamp
none of the above
Q.18
The time taken by the machine to attain 0.632 of its final steady temperature rise is called
heating time constant
cooling time constant
either (A) or (B)
none of the above
Q.19
With direct water cooling it is possible to have ratings of about
200 MW
300 MW
400 MW
600 MW
Q.20
In induction motors, the length of air gap in kept as small as mechanically possible is order to have
low power factor
high power factor
high over load capacity
any of the above
Q.21
Which of the following methods does not take into account the maximum temperature rise under variable loadconditions ?
Equivalent power method
Equivalent current method
Method of average losses
Equivalent torque method
Q.22
In a Schering bridge the potential of the detector above earth potential is
a few volts only
1 kV
5 kV
10 kV
Q.23
Induction type single phase energy meters measure electric energy in
kW
Wh
kWh
VAR
None of the above
Q.24
To measure radio frequency, the suitable frequency meter is
Weston frequency meter
reed vibrator frequency meter
heterodoxy frequency meter
electrical resonance frequency meter
Q.25
The cold rolled grain oriented steel has ______ permeability in the direction of the grain orientation.
minimum
maximum
nil
none of the above
Q.26
D.C. windings are
sometimes 2-layer type
never 2-layer type
always 2-layer type
none of the above
Q.27
The design of electromagnets is based upon which of the following fundamental equations ?
Force equation
Magnetic circuit equation
Heating equation
Voltage equation
All of the above
Q.28
The length cf air gap to be provided in ______ is primarily determined by power factor consideration.
d.c. series motor
d.c. shunt motor
induction motor
synchronous motor
Q.29
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.30
Power transformers should be designed to have maximum efficiency
at one-fourth load
at one-half load
at or near full load
any of the above
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