ECET EEE 2011-2

1. The advantage of capacitor start motor compared to standard split phase winding motor is that

A. it induces less back emf
B. it induces more back emf
C. it develops low starting torque
D. it develops high starting torque

Answer : it develops high starting torque
Explanation:-

2. A 4-Pole,50Hz induction motor is found to be running on full load a slip of 5 % . The speed of the induction motor is

A. 950 rpm
B. 1425 rpm
C. 1575 rpm
D. 2850 rpm

Answer : 1425 rpm
Explanation:-

3. The complex power drawn by an inductive circuit is 3000w+j4000VAR, then the power factor is given by

A. 0.6
B. 0.75
C. 0.8
D. 1

Answer : 0.8
Explanation:-

4. The maximum power that a 12v DC Source with an internal resistance of 2 ohms can supply to a resistive load is

A. 18W
B. 24W
C. 36W
D. 72W

Answer : 72W
Explanation:-

5. The unit of absolute permittivity of a medium is

A. Joule/coloumb
B. Newton metre
C. Farad/metre
D. Farad/coloumb

Answer : Farad/metre
Explanation:-

6. The capacity of a lead acid cell does not depend on its

A. rate of charge
B. rate of discharge
C. temperature
D. quantity of active material

Answer : rate of charge
Explanation:-

7. Two similar electric charges of 1C each are placed 1m apart in air. Force of repulsion between them would be nearly newtons

A. 1
B. 9x10^9
C. 4pi
D. 0

Answer : 9x10^9
Explanation:-

8. Two heaters rated at 1000w,250V each are connected in series across a 250v,50Hz AC Mains. The total power drawn from the supply would be

A. 1000W
B. 500W
C. 250W
D. 2000W

Answer : 1000W
Explanation:-

9. A semiconductor is electrically neutral because

A. no majority carriers
B. no minority carriers
C. no free carriers
D. equal positive and negative carriers

Answer : equal positive and negative carriers
Explanation:-

10. Materials which are good conductors of both heat and electricity are

A. metals
B. ceramics
C. polymers
D. pvc

Answer : metals
Explanation:-