AP ECET EEE 2019-4

1. The maximum speed at which train runs on main line railway service is ________

A. 160 kmph
B. 120 kmph
C. 100 kmph
D. 200 kmph

Answer : 160 kmph
Explanation:-

2. The type of single phase induction motor having the highest power factor at full load is ________

A. Shaded pole type
B. Split phase type
C. Capacitor start type
D. Capacitor run type

Answer : Capacitor run type
Explanation:-
In capacitor run type single phase induction motor, the capacitor is always connected in winding so it improves the power factor.

3. If the applied voltage to a DC machine is 230v , then the back emf for maximum Power developed is _______

A. 115v
B. 200v
C. 230v
D. 460v

Answer : 115 V
Explanation:- The condition for maximum power developed is Eb=V/2
Eb=230/2=115V

4. Number of Comparators required to build a 5 bit Analog to digital converter is

A. 5
B. 11
C. 21
D. 31

Answer : 31
Explanation:- Number of comparators for ADC = 2^(n)-1
n is number of bits
Number of bits=2^(5)-1
=32-1
=31

5. Which of the following power plants is free from environmental problems

A. Diesel engine
B. Nuclear
C. Hydroelectric
D. Steam

Answer : Hydroelectric
Explanation:-

6. The logic function A+BC is the simplified form of which of the following

A. AB+BC
B. A+C
C. A+B
D. (A+B)*(A+C)

Answer : (A+B)*(A+C)
Explanation:- (A+B)*(A+C)
=AA+AC+BA+BC (AA=A)
=A+AC+AB+BC
=A(1+C+B)+BC 1+C+B=1
=A(1)+BC
=A+BC

7. A thyristor equivalent of a thyratron tube is ______

A. SCR
B. UJT
C. Diac
D. Triac

Answer : SCR
Explanation:-

8. An ideal synchronous motor has no starting torque because the

A. Relative velocity between the stator and the rotor mmfs is Zero
B. rotor is made up of salient poles
C. Relative velocity between the stator and the rotor mmfs is not Zero
D. Rotor winding is highly reactive

Answer : Relative velocity between the stator and the rotor mmfs is Zero
Explanation:-
Relative velocity between the stator and the rotor mmfs is Zero, so the synchronous motor is not a self starting motor.

9. For a NPN bipolar transistor,what is the main stream of current in the base region

A. Drift of holes
B. Diffusion of holes
C. Drift of electrons
D. Diffusion of electrons

Answer : Diffusion of electrons
Explanation:-

10. The short length of the conductor used to connect the line conductor on one side of the terminal pole to the conductor on the other side of the pole is known as

A. Jumper
B. Petticoat
C. Guard
D. Guv

Answer : Jumper
Explanation:-