ECET EEE 2009-4

1. One of the following parts is responsible in converting alternating voltage induced in a d.c machine into unidirectional one.

A. commutator
B. armature
C. brush gear
D. commutator and Brush gear

Answer : commutator
Explanation:-

2. A d.c machine is provided with both interpoles and compensating windings. These two with respect to armature circuit will be in

A. parallel
B. series
C. former in series and latter in parallel
D. Former in parallel and latter in series

Answer : series
Explanation:-

3. In a level compound generator the terminal voltage at full load

A. Equal to no - load voltage
B. More than no - load voltage
C. Less than no load voltage
D. Much more than no load voltage

Answer : Equal to no - load voltage
Explanation:-

4. The direction of rotation of d.c shunt motor can be reversed by

A. Reversing current in the field winding
B. Reversing the polarity of supply
C. Both (1) and (2)
D. By adding resistance in the armature

Answer : Reversing the polarity of supply
Explanation:-

5. A series motor is running at a speed 'N'. When a diverter is connected across the field, the speed of the motor will be

A. Less than N
B. More than N
C. Equal to N
D. Zero

Answer : More than N
Explanation:-

6. A series motor is driving a load whose torque varies as the square of thr speed. when the speed is 250rpm, the line current in 15Amp. If the speed is raised to 500rpm, the line current is likely to be

A. 15 Amp
B. 21 Amp
C. 30 Amp
D. 60 Amp

Answer : 30 Amp
Explanation:-

7. Which one of the meter is an integrating type

A. Ammeter
B. Wattmeter
C. Frequency Meter
D. Energy Meter

Answer : Energy Meter
Explanation:-

8. Current transformer secondary should not be open curcuited when primary carries current, because

A. It fails to read
B. High voltage will be induced in the primary side
C. High voltage will be induced in the secondary side
D. Core gets saturated in addition to high voltage on secondary side

Answer : Core gets saturated in addition to high voltage on secondary side
Explanation:-

9. Merz-price maximum demand indicator reads

A. Average value
B. RMS Value
C. Maaximum value
D. Square of the RMS Value

Answer : Average value
Explanation:-

10. Form fator of a pure sine wave is

A. 1.0
B. 2.0
C. 1.3
D. 1.11

Answer : 1.11
Explanation:-