TS ECET EEE 2020-2

1. The commutator segments are insulated from each other using

A. Mica
B. Wood
C. Paper
D. Glass

Answer : A. Mica
Explanation:-

2. A DC Series motor is started at no-load, its speed will be

A. zero
B. rated speed
C. below rated speed
D. infinite

Answer : D. infinite
Explanation:-

3. A six pole wave wound DC Shunt generator has 300 conductors on its armature. The flux per pole is 20mwb, when it run at 1000rpm, the emf generated is

A. 100V
B. 150V
C. 300V
D. 210V

Answer : C. 300V
Explanation:-

4. A 100V DC series motor takes 45A when running at 750rpm, its armature resistance is 0.22ohms, while the series fiels resistance is 0.13 ohms. Iron and friction losses amount to 750W. The shaft power of the DC Series motor is

A. 1.041 KW
B. 2.041 KW
C. 3.041 KW
D. 4.041 KW

Answer : C. 3.041 KW
Explanation:-

5. The megger is used to measure

A. current
B. voltage
C. insulation resistance
D. capacitance

Answer : C. insulation resistance
Explanation:-

6. The most efficient form of damping employed in electrical instruments is

A. air friction
B. fluid friction
C. eddy current
D. gas friction

Answer : C. eddy current
Explanation:-

7. Kwh meter can be classified as

A. deflecting instrument
B. digital instrument
C. recording instrument
D. indicating instrument

Answer : C. recording instrument
Explanation:-

8. The meter suitable for only direct current measurements is

A. moving iron type
B. Permanent magnet type
C. electro dynamic type
D. hot-wire type

Answer : B. Permanent magnet type
Explanation:-

9. The moving iron instruments have ______ scale

A. Uniform
B. Non-uniform
C. No-scale
D. Digital

Answer : B. Non-uniform
Explanation:-

10. The damping force acts on the moving system of an indicating instrument, only when it is

A. Moving
B. stationary
C. just starting to move
D. Near its full deflection

Answer : A. Moving
Explanation:-