AUTOMOBILE ENGINEERING MCQ SECTION 7

61. The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is

(A) same

(B) more

(C) less

(D) less or more depending on operating conditions

Answer: - more

62. The magneto in an automobile is basically

(A) transformer

(B) D.C. generator

(C) capacitor

(D) magnetic circuit

Answer: - D.C. generator

63. Flash point of fuel oil is

(A) minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

(B) temperature at which it solidifies or congeals

(C) temperature at which it catches fire without external aid

(D) indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off

Answer: - minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

64. The efficiency of the solar cooker can be increased by placing a

(A) plane mirror

(B) convex lens

(C) concave lens

(D) none of these

Answer: - plane mirror

65. Which of the following is not combustible?

(A) oxygen

(B) hydrogen

(C) butane

(D) methane

Answer: - oxygen

66. Energy from gravitational field is energy obtained from

(A) wind

(B) biomass

(C) coal

(D) tides

Answer: - Tides

67. What is the calorific value of diesel?

(A) 45 kJ/kg

(B) 46 kJ/kg

(C) 47 kJ/kg

(D) 48 kJ/kg

Answer: - 45 kJ/kg

68. A substance which produces a lot of heat on burning is called

(A) oxidising agent

(B) biogas

(C) biomass

(D) fuel

Answer: - fuel

69. Which of the following variables controls the physical properties of a perfect gas?

(A) pressure

(B) temperature

(C) volume

(D) all of the above

Answer: - all of the above

70. In a centrifugal pump casing, the flow of water leaving the impeller, is

(A) rectilinear flow

(B) radial flow

(C) free vortex motion

(D) forced vortex

Answer: - free vortex motion