ECET EEE Model Paper-1 Part10

1. Which of the following is an active device

A. Electric bulb
B. Transformer
C. SCR
D. Loud speaker

Answer : SCR
Explanation:-

2. The number of p-n junctions in a thyristor is

A. 1
B. 2
C. 3
D. 4

Answer : 3
Explanation:-

3. Battery operator scooter for braking uses

A. Plugging
B. Mechanical braking
C. Regenerative braking
D. Reo static braking

Answer : Mechanical braking
Explanation:-

4. The park inverse voltage (PIV) is the maximum reverse voltage that can be applied to a diode without

A. Burn out
B. Destruction
C. Over heating
D. Charging

Answer : Destruction
Explanation:-

5. Which of the following are Universal Gates

A. AND,OR
B. NAND,NOR
C. NOR,OR
D. NAND,AND

Answer : NAND,NOR
Explanation:-

6. The property of element which opposes flow of current is

A. Resistance
B. Inducatance
C. Capacitance
D. Conductance

Answer : Resistance
Explanation:-

7. The direction of rotation of a D.C. series motor can be changed by

A. interchanging supply terminals
B. interchanging field terminals
C. either of (a) and (b) above
D. None of the above

Answer : interchanging field terminals
Explanation:-

8. Which D.C. motor is preferred for elevators ?

A. Shunt motor
B. Series motor
C. Differential compound motor
D. Cumulative compound motor

Answer : Cumulative compound motor
Explanation:-

9. Starters are used with D.C. motors because

A. these motors have high starting torque
B. these motors are not self-starting
C. back e.m.f. of these motors is zero initially
D. to restrict armature current as there is no back e.m.f. while starting

Answer : to restrict armature current as there is no back e.m.f. while starting
Explanation:-

10. The type of D.C. motor used for shears and punches is

A. shunt motor
B. series motor
C. differential compoutid D.C. motor
D. cumulative compound D.C. motor

Answer : cumulative compound D.C. motor
Explanation:-