MCQ Robotics Unit 3

1.In a stepper motor, how is the speed of rotation determined?

1. By the magnitude of the voltage applied

2. By the frequency of the waveforms used.

3. By the load applied to the motor. 

4. By the current supplied to the motor.

 Ans=2

2.What form of sound actuator would usually be used for ultrasonic

applications?

1. A permanent-magnet speaker

2. A piezoelectric actuator. 

3. A moving-iron speaker. 

Ans=2

3.Many wrist watches use electric motors to move conventional hands. What form of motor is most suited to this application?

1. An AC motor.

2. A stepper motor

3. A DC motor.

 Ans=2

4. Which of the following is type of actuator in a hydraulic system

a. Pump

b. Valve

c. Strainer

d. Cylinder

Ans-d

5. Which of the following is not true about use of air in pneumatic. a. Air is available every where

b. Air requires no return lines

c. Air is explosive

d. Air is non-pollutant

Ans=C

6. Which motor causes heavy loads due to its usage in order to move at

constant lower speeds?

a. Low-torque high-speed motors

b. High-torque low-speed motors

c. both a and b

d. none of the above

Ans=b

7. What is the function of hydraulic motor?

1. hydraulic motor converts hydraulic oil under pressure into torque and

angular displacement

2. hydraulic motor converts hydraulic oil under pressure into force and

linear displacement

3. hydraulic motor converts hydraulic energy into mechanical energy

4. hydraulic motor converts mechanical energy into hydraulic energy

a. 1 and 4

b. 1 and 3

c. 2 and 3

d. 2 and 4

Ans= b.

8. Motors used in high speed applications have

a. high torque with high speed

b. low torque with high speed

c. high torque with low speed

d. none of the above

Ans=b

9. Which type of solenoid has more chances of coil failure?

a. AC solenoid

b. DC solenoid

c. both AC and DC solenoids

d. none of the above

Ans=a

10. Which of the following is a type of low-torque high-speed motor?

a. radial piston motors

b. axial piston motors

c. bent axis motor

d. gear motor

Ans= d

11. Which type of solenoid has more chances of coil failure?

a. AC solenoid

b. DC solenoid

c. both AC and DC solenoids

d. none of the above

Ans= a.

12. Which of the following statements are true for accumulator used in

hydraulic systems?

1. accumulator stores fluid with pressure

2. accumulator stores fluid without any pressure

3. accumulator stores compressible liquid

4. spring is used as an external source to keep the fluid under hydraulic

pressure

a. 1, 3 and 4

b. 2 and 3

c. 1 and 4

d. 2, 3 and 4

Ans= c. 13. The "end-effector" of a robot:

A. can be an actual tool

B. is the robot "hand" C. may have a gripping action

D. All of the above

E. None of the above

Answer: D

14. The condition for maximum efficiency for a D.C. generator is

A. Eddy current losses = stray losses

B. Hysteresis losses = eddy current losses

C. Copper losses = 0

D. Variable losses = constant losses

Ans= D

15. If a D.C. motor is connected across the A.C. supply it will

A.Run at normal speed

B.Not run

C.Run at lower speed

D.Burn due to heat produced in the field winding by eddy currents

Ans= D

16. In case of D.C. shunt motors the speed is dependent on back e.m.f. only because

A.Back e.m.f. is equal to armature drop

B.Armature drop is negligible

C.Flux is proportional to armature current

D.Flux is practically constant in D.C. shunt motors

Ans=D

BEST OF LUCK