AP ECET EEE 2018-2

1. The voltage regulation of an over compound DC generator is always

A. positive
B. negative
C. zero
D. high

Answer : B. negative
Explanation:-

2. DC Shunt motors are commonly used in

A. cranes
B. electric traction
C. elevators
D. lathe machines

Answer : D. lathe machines
Explanation:-

3. The voltage equation of a DC motor is

A. V=Eb/IaRa
B. Eb=V+IaRa
C. V=Eb+IaRa
D. V=Eb-IaRa

Answer : C. V=Eb+IaRa
Explanation:-

4. A 4pole 240V dc series motor has a wave wound armature with 180 conductors The armature resistance and field winding resistance are 0.10ohm and 0.20ohm respectively.If the motor is drawing 40A current at 0.015wb flux per pole, then the speed under this condition is ______ rpm

A. 2533.33
B. 2644.4
C. 2756.9
D. 2987.6

Answer : A. 2533.33
Explanation:-

5. The capacity of a battery is expressed in

A. watts
B. Volt hours
C. Aphere hours
D. Ohm hours

Answer : C. Aphere hours
Explanation:-

6. Moving coil and moving iron instruments can be distinguished by looking at

A. their range
B. pointer
C. scale
D. size of terminals

Answer : C. scale
Explanation:-

7. In dynamometer wattmeter, number of coils used are _____

A. 2
B. 3
C. 4
D. 6

Answer : A. 2
Explanation:-

8. Which of the following transducer is known as self generating transducer?

A. passive transducer
B. active transducer
C. secondary transducer
D. Analog transducer

Answer : B. active transducer
Explanation:-

9. When a Megger is not in operation then its needle shows a resistance of ______

A. zero ohms
B. 10 ohms
C. 100 ohms
D. infinity

Answer : D. infinity
Explanation:-

10. In a pure inductive circuit, the voltage will be

A. In phase with current
B. Lags the current by 90 degrees
C. Leads the current by 90 degrees
D. Lags the current by 45 degrees

Answer : C. Leads the current by 90 degrees
Explanation:-