Basic Electrical Engineering Mid - II, November - 2014

1.Torque/weight ratio of an instrument indicate
  • selectivity
  • accuracy
  • fidelity
  • sensitivity
Answer: D
2.Sensitivity of a voltmeter is given by
  • ohm/vol
  • reciprocal of full scale current
  • both A & B
  • none of these
Answer: C
3.The Input Supply to the DC Generator is
  • mechanical energy
  • electrical Energy
  • A & B
  • none
Answer: A
4.The PMMC instrument measures
  • dc
  • ac
  • ac & dc
  • none
Answer: A
5.Which one of the following is an integrated type instrument.
  • ammeter
  • voltmeter
  • Wattmeter
  • energy meter
Answer: D
6.The emf induced in a conductor in any magnetic field is
  • dc
  • ac
  • ac & dc
  • none
Answer: B
7.Armature of a dc machine is made of
  • conducting material
  • insulating material
  • non-ferrous material
  • silicon steel
Answer: D
8.An induction motor works with
  • dc only
  • ac only
  • ac & dc only
  • none
Answer: B
9.The relative speed between stator and rotor fluxes in 3-phase induction motor is equal to
  • NS
  • NR
  • Zero
  • NS - NR
Answer: C
10.The frame of an induction motor is made of
  • aluminium
  • silicon steel
  • CRGO steel
  • stainless steel
Answer: C
11.In a 3-phase squirrel cage induction motor, rotor conductors are short circuited through __________________________
Answer: End Rings
12.A wound rotor induction motor can be distinguished from squirrel cage induction motor by______________________________
Answer: Slip Rings
13.For a P-pole machine, the relation between the electrical and mechanical degrees is _____________________________
Answer:
14.Laminated yoke in a dc motor can reduce_______________________
Answer: Iron Loss
15.Max efficiency of dc motor occurs when _______________________
Answer: Constant Losses Equals To Variable Losses
16.The ____________________torque must operate only when the moving system of instrument is actually moving.
Answer: Damping
17.If an instrument has square law response, it can be used for the measurement of __________________________
Answer: AC and DC
18.___________________ type of controlling system is adopted in an energy meter.
Answer: Braking magnet
19.The deflection torque of a moving iron instrument is _____________________.
Answer: I2 dl/d
20.The internal resistance of milli ammeter must be ___________________.
Answer: Very Low