A. constant torque drive
B. constant voltage drive
C. constant current drive
D. none of the above
Correct Answer: constant torque drive ✔
Last Updated: July 02, 2018
Related MCQs
- 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__________?
- Usually wide and sensitive speed control is desired in case of__________?
- Which of the following method of speed control of D.C. machine will offer minimum efficiency ?
- The armature torque of the D.C. shunt motor is proportional to__________?
- As -the load is increased the speed of D.C. shunt motor will__________?
- Which of the following motor has the poorest speed regulation ?
- Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of__________?
- In a differentially compounded D.C. motor, if shunt field suddenly opens__________?
- Following motor is used where high starting torque and wide speed range control is required?
- Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be__________?
- Speed control by Ward Leonard method gives uniform speed variation__________?
- Sparking, is discouraged in a D.C. motor because__________?
- Three point starter can be used for__________?
- Which D.C. motor is generally preferred for cranes and hoists ?
- In D.C. machines the residual magnetism is of the order of__________?
- For which of the following applications a D.C. motor is preferred over an A.C. motor ?
- The condition for maximum power in case of D.C. motor is__________?
- The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is__________?
- Which one of the following is not the function of pole shoes in a D.C. machine ?
- If the supply voltage for a D.C. motor is increased, which of the following will decrease ?
- Which of the following motor is preferred for operation in highly explosive atmosphere ?
- Sparking at the commutator of a D.C. motor may result in__________?
- In case of conductively compensated D.C. series motors, the compensating winding is provided__________?
- For the same H.P. rating and full load speed, following motor has poor starting torque__________?
- D.C. series motors are used__________?
- If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens__________?
- Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?
- Which D.C. motor has got maximum self loading property?
- The power mentioned on the name plate of an electric motor indicates__________?
- The current drawn by the armature of D.C. motor is directly proportional to__________?
- In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to
- The speed of a D.C. series motor is__________?
- The starting resistance of a D.C. motor is generally__________?
- Which of the following load normally needs starting torque more than the rated torque?
- Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?
- In D.C. motor which of the following can sustain the maximum temperature rise?
- The ratio of starting torque to full-load torque is least in case of__________?
- In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be__________?
- A three point starter is considered suitable for__________?
- In D.C. machines fractional pitch winding is used__________?
- In which of the following applications D.C. series motor is invariably tried?
- By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
- These days D.C. motors are widely used in__________?
- In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be__________?
- In case of D.C. shunt motors the speed is dependent on back e.m.f. only because__________?
- What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
- A direct on line starter is used: for starting motors__________?
- In a D.C. shunt motor, speed is__________?
- The speed of a D.C. shunt motor more than its full-load speed can be obtained by__________?
- When two D.C. series motors are connected in parallel, the resultant speed is__________?
- To get the speed of D.C, motor below the normal without wastage of electrical energy is used?