Q.1
In a Weston frequency meter, the magnetic axes of the two fixed coils are
  • parallel
  • perpendicular
Q.2
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.3
A Weston synchronoscope is a
  • moving coil instrument
  • moving iron instrument
  • dynamometer instrument
  • none of the above
Q.4
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.5
Wattmeter cannot be designed on the principle of
  • electrostatic instrument
  • thermocouple instrument
  • moving iron instrument
  • electrodynamic instrument
Q.6
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.7
If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is
  • 10°
  • 80°
  • 120°
  • 170°
Q.8
In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at
  • 0°
  • 60°
  • 90°
  • 120°
Q.9
In Weston synchronoscope the moving coil is connected across
  • bus-bars
  • incoming alternator
  • fixed coils
  • any of the above
Q.10
Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
  • Absolute instruments
  • Indicating instruments
  • Recording instruments
  • Integrating instruments
Q.11
A phase shifting transformer is used in conjunction with
  • potentiometer
  • Drysdale potentiometer
  • co-ordinate potentiometer
  • Crompton potentiometer
Q.12
An instrument transformer is used to extend the range of
  • induction instrument
  • electrostatic instrument
  • moving coil instrument
  • any of the above
Q.13
According to Lenz law write the formula for finding emf induced in the coil?
  • MMM=NIMMM=NIMMM=NI
  • $B=\phi\div A$
  • $E=-\frac{\text{d}\phi}{\text{dt}}$
  • $H=\frac{MMF}{L}$
Q.14
How will you find the magnetic field strength?
  • MMM=NIMMM=NIMMM=NI
  • $B=\phi\div A$
  • $E=\frac{\text{d}\phi}{\text{dt}}$
  • $H=\frac{MMF}{L}$
Q.15
How will you find the magnetic flux density?
  • MMM=NIMMM=NIMMM=NI
  • $B=\phi\div A$
  • $E=\frac{\text{d}\phi}{\text{dt}}$
  • $H=\frac{MMF}{L}$
Q.16
Write the formula for finding mmf?
  • mmf=NImmf=NImmf=NI
  • $B=\phi\div A$
  • $E=\frac{\text{d}\phi}{\text{dt}}$
  • $H=\frac{MMF}{L}$
Q.17
Write the formula for finding emf induced in the coil?
  • MMM=NIMMM=NIMMM=NI
  • $B=\phi\div A$
  • $E=\frac{\text{d}\phi}{\text{dt}}$
  • $H=\frac{MMF}{L}$
Q.18
What is the relationship between the VA rating of a transformer and the internal percentage impedance Z?
  • VA ∝1/ Z
  • VA ∝Z
  • VA ∝2Z
  • VA ∝ Z/2
Q.19
How can the direction of a capacitor start single phase motor be reversed?
  • Reverse the connection to the capacitor
  • Reverse the connection to the start winding
  • Reverse the polarity of the supply
  • Reverse the connection of the start and run windings
Q.20
When are single phase series universal motors used?
  • When high starting torque is required
  • When starting on no-load is required
  • When constant speeds are required
  • When low speed drives are required
0 h : 0 m : 1 s