**1.** Ward-Leonard system of speed control is not recommended for _________

- Constant speed operation
- Wide speed
- Frequent-motor reversed
- Very slow speed

**2.** In Ward Leonard speed control method for lowering the speed of the motor ______________

- Reduce armature voltage
- Increase armature voltage
- Increase field current
- Decrease field current

**3.** Reducing the armature voltage will give us _________

- Variable torque speed control
- Constant torque speed control
- Variable and constant both can be achieved
- Cannot comment on torque

**4.** In Ward Leonard speed control method for increasing the speed of the motor ______________

- Reduce armature voltage
- Increase armature voltage
- Increase field current
- Decrease field current

**5.** Reducing the field current will give us _________

- Constant torque and variable power speed control
- Constant torque speed control
- Variable power speed control
- Constant power speed control

**6.** Ward Leonard control is basically a _________ control method for below-rated speed.

**7.** Speed-power characteristic for Ward Leonard speed control method __________

- Will start from origin
- Will start from some positive value on power axis
- Will start from some positive value on speed axis
- Depends on other parameters

**8.** Efficiency of Ward Leonard method is ________

- Higher than rheostatic control method but lower than shunted field control method
- Lower than rheostatic control method
- Higher than rheostatic control method and shunted field control method
- Depends on load

**9.** ________ is an ideal choice for the motor which undergoes frequent starting, stopping, speed reversal.

- Armature Control Method
- Field Control Method
- Rheostat control Method
- Ward Leonard Method

**10.** Starting gear used in Ward Leonard method___________

- Is of small size
- Is of large size
- Size depends on the application
- Is absent

**11.** To get the speed of DC motor below the normal speed without wastage of electrical energy we use ________

- Ward Leonard control
- Rheostatic control
- Any of the Ward Leonard or rheostatic method can be used
- Not possible

**12.** A 220 V d. c. shunt motor running at 1000 rpm takes an armature current of 17.5 A. It is required to reduce the speed to 600 rpm. What must be the value of resistance to be inserted in the armature circuit if the original armature resistance is 0.4 Ω. Take armature current to be constant during this process.

- 4.8 Ω
- 4.4 Ω
- 0.4 Ω
- 5.4 Ω

**13.** Speed control by Ward Leonard method, can give uniform speed variation ________

- In both directions
- In one direction
- Below normal speed only
- Above normal speed only

**14.** In Ward Leonard’s control of DC motor, the lower limit of speed is imposed by ____________

- Residual magnetism of the generator
- Core losses of motor
- Mechanical losses of motor and generator together
- Cannot be determined

**15.** The disadvantage of the Ward Leonard control method is ___________

- High initial cost
- High maintenance cost
- Low efficiency at high loads
- High cost, high maintenance and low efficiency

**16.** Speed control by Ward Leonard method gives uniform speed variation

**17.** Variation in speed by Ward-Leonard control method of D.C. motors occurs due to variation in

- Field excitation
- Armature current
- Armature voltage
- Supply voltage

**18.** The application of Ward Leonard’s method of speed control is

- Elevator
- Rolling Mills
- Ship propulsion
- All of the above