With the increase in temperature, the speed of DC series motor______________?

Related Mcqs:

1. With the increase in temperature, the speed of DC shunt motor____________?

   A. decreases. B. increases C. remain same D. none of the above...

2. When two D.C. series motors are connected in parallel, the resultant speed is____________?

   A. more than the normal speed B. loss than the normal speed C. normal speed D. zero...

3. The speed of a D.C. series motor is_____________?

   A. proportional to the armature current B. proportional to the square of the armature current C. proportional to field current D. inversely proportional to the armature current...

4. The speed of a D.C. shunt motor more than its full-load speed can be obtained by_____________?

   A. decreasing the field current B. increasing the field current C. decreasing the armature current D. increasing the armature current...

5. Speed control by Ward Leonard method gives uniform speed variation_____________?

   A. in one direction B. in both directions C. below normal speed only D. above normal speed only...

6. The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is______________?

   A. 2.36% B. 4.76% C. 6.77% D. 8.84%...

7. The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by______________?

   A. reducing the field current B. decreasing the armature current C. increasing the armature current D. increasing the excitation current E. none of the above methods...

8. If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor_____________?

   A. of lower H.P. should be selected B. of higher H.P. should be selected C. can be used for 50°C ambient temperature also D. is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor...

9. In which of the following applications D.C. series motor is invariably tried?

   A. Starter for a car B. Drive for a water pump C. Fan motor D. Motor operation in A.C. or D.C...

10. Which of the following test can be performed on DC series motor?

    A. Swinburne test B. Hopkinson test C. Brake test D. Field test...